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Group Title: Circular
Title: Chemical weed control for Florida vegetable crops
CITATION THUMBNAILS PAGE IMAGE ZOOMABLE
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00084586/00001
 Material Information
Title: Chemical weed control for Florida vegetable crops
Series Title: Circular
Physical Description: 19 p. : charts ; 23 cm.
Language: English
Creator: Montelaro, James, 1921-
Florida Cooperative Extension Service
University of Florida -- Institute of Food and Agricultural Sciences
Publisher: Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida,
Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida
Place of Publication: Gainesville Fla
Publication Date: 1976
Copyright Date: 1976
 Subjects
Subject: Vegetables -- Weed control -- Florida   ( lcsh )
Weeds -- Control -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: prepared by James Montelaro in cooperation with personnel of the University of Florida, Institute of Food and Agricultural Sciences.
General Note: Cover title.
General Note: "October, 1976"--P. 2 of cover.
General Note: "12-3M-76"--P. 4 of cover.
 Record Information
Bibliographic ID: UF00084586
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 81177626

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    Tables
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        Page 18
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    Back Cover
        Back Cover
Full Text






CHEMICAL WEED CONTROL


Florida Cooperative Extension Service
Institute of Food and Agricultural Sciences
University of Florida, Gainesville









CONTENTS


Page

In trodu action ................. ........ .............. .......... .. ............................................................. 1
D efin ition of T erm s ... ............. ....................................................................................... ... .... 1
P recau tion ary M ea su res ............................................................................................................................... 2
G en era l R u le s ........................... ............................................... ....... ..................... ............ 3
E qu ipm ent for A p p location ................................................... ............................................. ...... 3
F orm u nation of H erb icid es ......................................................................................................................... 4
Calibration of Sprayer .......~...................... 5
Cleaning the Sprayer .. ........... .......................................................... 6
Common and Typical Trades Names of Herbicides ..................................................... 7
Instructions for Use of Herbicide Table ........ ...... ... ............................... ....... 8
Table 1. Herbicides for Vegetable Crops-Timing and Rates
on F lorida S oils ... ......... ..... ........................... ... .................................9-19


October, 1976


Prepared by James Montelaro in cooperation with personnel of the Uni-
versity of Florida, Institute of Food and Agricultural Sciences. Special
assistance was provided by Mr. D. S. Burgis, Dr. G. W. Elmstrom, Dr. S. J.
Locascio, Dr. W. T. Scudder and Dr. J. R. Shumaker in the preparation of
this manuscript.







CHEMICAL WEED CONTROL
FOR FLORIDA VEGETABLE CROPS



INTRODUCTION
Weed control in vegetable crops has always been a critical part of
the production program. The advent and use of herbicide materials
to control competing weeds have lessened the need for cultivation
and hand labor to do that job.
Losses in yield due to the competitive effects of weeds are known
and can be easily demonstrated. The use of herbicides in vegetable
production has rapidly increased since first discovered a number of
years ago. Herbicides are now routinely used as part of the production
program in vegetables. They not only insure potential yield by re-
moving competitive weeds, but reduce the inputs of labor and energy
previously required for weed control.
It is the purpose of this guide to assemble the herbicide recom-
mendations for Florida vegetable crops. These recommendations have
been developed by the Institute of Food and Agricultural Sciences re-
search personnel from test results and experience with these materials
in various portions of the state.
Literature describing each chemical is available from the manu-
facturer. For additional details on use of herbicides, consult your
County Extension Agent.
The effectiveness of herbicides may vary under different soil and
climatic conditions. For that reason, when introducing a new herbi-
cide to a weed control program, the grower is urged to keep its use to
a limited acreage until he has gained experience with it and has ob-
served its effectiveness under his conditions.

DEFINITION OF TERMS
Band application-an application to a continuous restricted area, such
as in or along a crop row rather than over the entire field area.
Crop-a plant growing where it is desired.
Directed application (directionally)-an application to restricted area,
such as to the soil at the base of the crop plants.
Herbicide-a chemical used for killing or inhibiting the growth of
plants or germination of seed.







Lay-by-at time of last cultivation.
Preemergence-prior to emergence of specified weed or crop.
Preplanting-any time before the crop is planted.
Pretransplanting-any time before the crop is transplanted.
Postemergence-after emergence of specified weed or crop.
Posttransplanting-after the crop is transplanted.
Rate-the amount of active ingredient or acid equivalent of an herbi-
cide applied to a unit area (generally stated in pounds per acre on a
broadcast basis).
Selective herbicide-a chemical that is more toxic to some plant species
than to others.
Surfactant-materials used in pesticide formulations to impart emul-
sifiability, spreading, wetting, dispersibility, or other surface-modify-
ing properties.
Spray drift-the undesirable movement of airborne spray particles
from the intended target area.
Weed-a plant growing where it is not desired.
Weed Control-the process of limiting weed population or density so
that crops can be grown profitably or other production operations can
be conducted efficiently.

PRECAUTIONARY MEASURES
Herbicides, like any pesticide, should be handled with care. They
should be treated as poisons and considered potentially dangerous to
man and animals. Avoid prolonged or repeated contact with the skin,
and be sure to wash thoroughly after using. Store herbicides behind
locked doors in original containers with labels intact. Store separate
from seed, fertilizers and other pesticides to prevent contamination
which could lead to undesirable results. Destroy empty containers so
that any hazard through misuse will not result.


Read the Label
Follow safety precautions given by the manufacturer. The crop,
rate and time schedule are listed on the label. Do not use herbicides
contrary to the label recommendation.







Use "New" Herbicides on a Limited Scale


Herbicides being used for the first time should be applied to a
small area by the grower. Experience in application and results will
be gained on this limited scale without jeopardizing a large part of
the crop.
Avoid Application to Non-Target Areas
Accidental or negligent misapplications of herbicides by drift or
other means to adjoining non-target areas must be prevented. Drift
hazards can be minimized by applying only during low wind velocities,
using anti-drift spray materials, lower pump pressures, larger orifice
nozzles, and other means available to the grower. Do not allow spray
drift, runoff from sprayer cleaning or other undesirable sources to
pollute water supplies of any nature.


GENERAL RULES

Know Your Weed Problem
Each herbicide has a spectrum of weeds which it will characteris-
tically control. In order to correctly select the herbicide to be used,
the weeds expected to be a problem must be known.

Know Your Herbicide
In addition to the weed spectrum of the material, one should be
familiar with:
The potential hazard of the material to man and animals.
Degree of susceptibility of each crop.
Restrictions on rates, timing and crops for which approved.
Peculiarities specific to each herbicide; for example, do not use
on soils with less than 1% organic matter, or do not replant
with other crops.
After an herbicide is applied, the treated soil should not be dis-
turbed unless otherwise specified for the herbicide. Care must be
exercised in cultivation to prevent untreated soil from being moved
to a treated area.

EQUIPMENT FOR APPLICATION
Application equipment must be suited for herbicide materials.
Many types of sprayers or granular applicators are available for use







and no discussion as to their relative merits will be given here. Certain
generalities, however, can be given regarding features of a good unit.
Sprayers must have adequate agitation to insure proper suspen-
sion at all times when using wettable powders. Adequate pump capaci-
ty to supply the delivery volume as well as a good pressure regulation
system to insure correct rate of application is necessary. The boom
and nozzle arrangement should be designed for easy a.iid ini', if and
calibration.
Granular applicators are usually less complicated and, as a result,
easier to maintain. However, periodic service, adjustment and cali-
bration are necessary to insure proper rate of application of the
materials.

FORMULATIONS OF HERBICIDES

Herbicides are available in one of several forms depending upon
the nature of the chemical and use. Herbicides are manufactured as
wettable powders (WP), emulsifiable concentrates (EC), and granules
(G). In each case, the label will state the concentration of the materi-
al. The active ingredient of wettable powders and granular materials
is given as a percent of total weight. Liquid materials are expressed
as pounds of active ingredient per gallon. Common formulations are
501', 755% and 80'" wettable powders and 2, 4 and 6 pounds per gallon
emulsifiable concentrates. Recommendations in this circular are given
as pounds per acre of active ingredient (lb/A a.i.).
If 2 lb/A is recommended and the herbicide is a 50,; wettable
powder, how much of the trade name material would you add to
enough water to spray an acre ?

Rate (lb A active ingredient) amount of trade name
Percent active ingredient material to use
(decimal equivalent)

Thus, for the example:

2 lb
.5 (o WP) = 4 lb. of trade name WP material
.5 (50% WP)

A formula similar to one used for dry materials can be used to cal-
culate the quantity of a liquid material.

Rate (lb/A active ingredient)
Pound- = gallons of trade name material
Pounds active per gallon








Example: If a 2 lb A a.i. rate is desired and the trade name material
is 1 lb/gallon:

2 lb
Slb--galln gallon of trade name material
4 lb/gallon

CALIBRATION OF SPRAYER
Calibration of the sprayer is an important factor in successful
weed control. Unless the correct amount of herbicide is applied in the
proper way, the operation may be a total failure and crop injury may
result.
Before each use and periodically during its operation, adjust the
nozzle pattern, clean the screens and calibrate the sprayer in the field.
For overall soil coverage, adjust the boom so that fan-type nozzle cov-
erage overlaps according to specifications at ground level for preemer-
gence spraying, or at the tops of growing weeds for postemergence
spraying.
For band application, use an even-spray, fan-type spray nozzle
(Type E or ES). Adjust height of boom for the width of hand desired.
Usually, 8 to 12-inch hands are used. (alibrate for the actual area
sprayed, not for the total acres in the field. For example, only one-
fourth of the surface area is sprayed if a 12-inch band application is
used on a ,18-inch row. Assuming a suggested rate of 6 pounds of a
certain chemical per crop acre for overall application, the above would
require only 1.5 pounds of actual materials for one acre of the crop.
As one method of determining the rate of application, fill the tank
with water, then run the sprayer for (660 feet preferablyy in the field)
at the speed and pressure to 1ie used in actual operation; then, refill
the tank to determine the number of gallons of water used. Measure
the width of the actual area sprayed. (For band application, this is
equal to the sum of the width of all the bands.) Then, calculate as
follows:

Gallons used (per 660') x 66
-- i = gallons per acre
Width of sprayed area in feet
If 12 gallons are used with 2-1 feet width of sprayed area on 660
feet, gallons per acre =

12 gals. x 66
S -= 33 gallons per acre*
24 ft.

This amount of spray will cover one acre of actual sprayed area. In the case of
spraying 12" bands over rows IS" apart (one-fourth of the actual area), 33
gallons should cover four crop acres. When preparing the spray, add the amount
of chemical recommended for one acre per 33 gallons of water.







Any change in tractor speed, pressure setting, nozzle size or band
width changes the rate of application and recalibration will be neces-
sary.
For detailed information on calibration of sprayer and granular
application equipment, see Florida Agricultural Extension Circular
275B.

CLEANING THE SPRAYER

It is almost impossible to clean equipment that has been used for
spraying herbicides. Hormone-type weed killers such as 2,4-D cannot
be removed completely from wooden tanks or corroded metal parts.
Never use this equipment for other purposes-such as application of
other herbicides, insecticides, fungicides and liquid fertilizers.
If it is absolutely necessary to use herbicide sprayers for other
types of spraying, try these cleaning procedures:

1. Use soap or detergent solutions for removing non-hormone
type weed killers. As an additional precaution, spray equip-
ment may be cleaned further by recirculating wash water con-
taining activated charcoal.
2. Hormone-type weed killers, such as 2,4-D, require chemical
cleaning.

A. To remove water-soluble salt formations, use one of the
following in 100 gallons of water:
(1) 1 gallon of household ammonia
(2) 5 lbs. sodium carbonate (sal soda)
(3) 2 lbs. sodium hydroxide (lye)
B. To remove oil-soluble emulsion formulations, use either one
of the following in 95 gallons of water:
(1) 2 lbs. sodium hydroxide (lye)
(2) 5 lbs. sodium carbonate (sal soda), plus 5 gallons
of kerosene and 1 lb. of detergent

Fill the tank and system with the cleaning solution and except
for lye solution, allow to stand in the sprayer for at least two hours.
Pump the solution out through the boom and nozzles and rinse thor-
oughly with water. Refill the tank with water, then drain and flush
immediately before using again.
If sprayer has been used for copper spraying, do not use for dino-
seb until after it has been cleaned with 1 gallon of vinegar in 100








gallons of water. Allow the cleaning solution to stand in the tank,
pump, hose and boom for two hours; then drain and rinse thoroughly
with water.








LIST OF COMMON, TRADE, AND CHEMICAL NAMES
OF HERBICIDES


Common Name


Chemical Name


Alanap Naptalam N-1-napththylphthalamic acid
Amiben Chloramben 3-amino-2,5-dichlorobenzoic acid (ammonium
salt)
(Several Brands) Atrazine 2-chloro-4-(ethylamino)-6-(isopropylamino) -s-
triazine
Balan Benefin N-butyl-N-ethyl-a,a,a-trifluoro-2,6-dinitro-p-
toluidine
Caparol Prometryne 2,4-bis (isopropylamino)-6-(methylthio) -s-
triazine
Dacthal DCPA dimethyl tetrachloroterephthalate
Dowpon, Basfapon Dalapon 2,2-dichloropropionic acid
Enide Diphenamid N,N-dimethyl-2,2-diphenylacetamide
Eptam EPTC S-ethyl dipropylthiocarbamate
Furloe, CIPC Chlorpropham isopropyl m-chlorocarbanilate
Kerb Pronamide N-(1,1-dimethylpropynyl)-3,5-dichlorobenza-
mide
Lasso Alachlor 2-chloro-2',6'-diethyl-N-(methoxymethyl)-
acetanilide
Lorox Linuron 3-(3,4-dichlorophenyl)-l-methoxy-l-methylurea
Prefar Bensulide 0,0-diisopropyl phosphorodithioate S-ester
with N-(2-mercaptoethyl) benzenesulfona-
mide
Premerge Dinoseb 2-sec-butyl-4,6-dinitrophenol
(Several Brands) Simazine 2-chloro-4,6-bis(ethylamino)-s-triazine
Randox CDAA N,N-diallyl-2-chloroacetamide
Sencor, Lexone Metribuzin 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-
1,2,4-triazin-5 (4H) -one
Treflan Trifluralin a,a,a-trifluoro-2,6-dinitro-N,N-dipropyl-p-
toluidine
Tenoran, Norex Chloroxuron 3-[p-(p-chlorophenoxy) phenyl]-l,l-di-
methylurea
Tillam Pebulate S-propyl butylethylthiocarbamate
TOK Nitrofen 2,4-dichlorophenyl-p-nitrophenyl ether
Vegadex CDEC 2-chloroallyl diethyldithiocarbamate
(Several Brands) 2,4-D (2,4-dichlorophenoxy) acetic acid


Trade Name







INSTRUCTIONS FOR USE OF HERBICIDE TABLE
The table that follows lists weed control treatments that have
shown good results in Florida. Always check container label for recent
changes regarding crops and rates approved by the Environmental
Protection Agency. Chemicals and rates listed without parentheses
under each soil type have been tested quite thoroughly and are, there-
fore, recommended for use. Those in parentheses have not been thor-
oughly tested, or have been less dependable and, therefore, are only
suggested for trial purposes.
Chemical rates of all herbicides, except for soil fumigants, are
given in terms of their active ingredients per acre. Except for mineral
spirits and chemicals formulated as granules, all of these should be
mixed with water before being applied as sprays.













The use of trade names in this publication is solely for the purpose of
providing specific information. It is not a guarantee or warranty of the
products named and does not signify that they are approved to the ex-
clusion of others of suitable composition.




Single copies are free to residents of Florida and may be obtained from the
County Extension Office. Bulk rates are available upon request. Please sub-
mit details of the request to C. M. Hinton, Publication Distribution Center,
IFAS Building 664, University of Florida, Gainesville, Florida 32611.





This public document was promulgated at an annual cost of
$728.99, or 24 cents per copy to inform commercial growers on
chemical weed control.






TABLE 1.- HERBICIDES FOR VEGETABLE CROPS-TIMING AND RATES ON FLORIDA SOILS
Time of Lbs./Acre (Active Ingredients) *
Application
Crops Herbicides to Crop : Sandy Soils Muck Soils Remarks
B an Bush EPTC Preplanting 3 Incorporate immediately after application.


and Pole Trifluralin


Preplanting


v to %


- May be applied up to 3 weeks before plant-
ing. Incorporate immediately after applica-
tion. The lower rate may be used on rock-
land and marl soils.


CDAA Preemergence 4 See footnote (3) at end of table.
CDAA +CDEC Preemergence 4 to 6 (total) 4 to 6 (total) See footnote (5) at end of table.
Note: Adjust proportion of each
according to weed species prob-
lem. Do not exceed 3 lb. CDAA
in mixture.
CDEC Preemergence 4 to 6 4 to 6 See footnote (4) at end of table.
DCPA Preemergence 101V2 -
Dinoseb Preemergence 3 6 CAUTION: Injury may result if heavy rains


EPTC


Postemergence


3 to 4


Beans, Lima Trifluralin Prtplarting to


follow treatment on sandy soil.
- At lay-by, apply directionally to base of
plants and incorporate lightly into soil.
May be applied up to 3 weeks before plant-
ing. Incorporate immediately after applica-
tion.









Table 1. (Continued)


Crops


Herbicides


Beans, Lima CDAA
CDAA+CDEC




CDEC
DCPA
Broccoli, Trifluralin
Cabbage,
0 Cauliflower
CDAA
(cabbage)


Time of
Application
to Crop '
Preemergence
Preemergence


Preemergence
Preemergence
Preplanting


Lbs./Acre (Active Ingredients) '
Sandy Soils Muck Soils Remarks


(4) (4)
4 to 6 (total) 4 to 6 (total)
Note: Adjust proportion of each
according to weed species prob-
lem. Do not exceed 3 lb. CDAA
in mixture.


4 to 6
10/2


% to 1


Preemergence 4


See footnote (3) at end of table.
See footnote (5) at end of table.


4 to 6 See footnote (4) at end of table.


- May be applied up to 3 weeks before plant-
ing or transplanting. Incorporate immedi-
ately after application.
4 See footnote (3) at end of table.


CDAA+CDEC Preemergence 4 to 6 (total) 4 to 6 (total) See footnote (5) at end of table.
(cabbage) Note: Adjust proportion of each
according to weed species prob-
lem. Do not exceed 3 lb. CDAA
in mixture.
CDEC Preemergence 4 to 6 4 to 6 See footnote (4) at end of table.
DCPA Preemergence 101/2 -
Nitrofen Preemergence 4 to 6 Good soil moisture is important. If dry,
overhead irrigate after treating.







Table 1. (Continued)


Herbicides
CDAA
(cabbage)


Time of
Application
to Crop '
Posttransplanting


CDAA CDEC Posttransplanting
(cabbage)


CDEC

DCPA
Nitrofen


Collards, CDEC
Mustard,
Turnips DCPA
Cantaloupes, Bensulide
Cucumbers


Posttransplanting

Posttransplanting
Postemergence
or
Posttransplanting


Prc. i,..I -n- '

Preemergence
Preplanting


Naptalam Preemergence


Lbs./Acre (Active Ingredients)

Sandy Soils Muck Soils Remarks


Crops
Broccoli
Cabbage,
Cauliflower


I t... ,

1012
5

3 to 4


4


4 to 6 (total) 4 t
Note: Adjust proport:
according to weed sp
lem. Do not exceed 3
in mixture.
4 to 6

10 12
2 to 4


4 See footnote (3) at end of table. Use pre-
emergence to weeds. Apply as a directed
spray to base of plants.
o 6 (total) See footnote (5) at end of table. Use pre-
ion of each emergence to weeds. Apply as a directed
ecies prob- spray.
lb. CDAA

4 to 5 See footnote (4) at end of table. Apply as a
directed spray.
Apply immediately after transplanting.
2 to 4 WETTABLEE POWDER ONLY.) Wait 7 to
10 days after transplanting before applying
nitrofen. See remarks under preemergence
treatment of these crops. Some cabbage
hybrids are less tolerant than other hybrids.
I t.. ,' I't I.I..NliA D II N LY S-. f.:..:.tn. ,.t.. ,4) at -.nd
of table.
--
Incorporate 1 to 11V inches deep in moist
soil. Plant immediately.
Surface soil must be moist at time of treat-
ment to insure good results.













Crops Herbicides
Cantaloupes, DCPA
Cucumbers Naptalam
Carrots Chloroxuron
Parsley

Linuron


Time of
Application
to Crop '
Postemergence
Postemergence
Postemergence


Postemergence


Mineral Spirits Postemergence


Celery


Nitrofen
CDAA


Postemergence

Posttransplanting


Table 1. (Continued)
Lbs./Acre (Active Ingredients) '

Sandy Soils Muck Soils Remarks


101 -


3 to 4
(2 to 3)


1, to 1


(40 to 60
gals.)
(2 to 6)


Apply 4 to 6 weeks after seeding.
CANTALOUPES ONLY.


(3 to 4) Apply overtop after 2 to 4 true leaves form.
Do not apply within 60 days of harvest.
Not approved on parsley.
1 to 1 Apply overtop after 4 true leaves form. Not
approved for use on parsley. Dot not use a
surfactant.
(40 to 60 Apply at 3-leaf stage.
gals.)
(2 to 6) ADply overtop after 2 to 4 true leaves form.
4 See footnote (3) at end of table. May be
repeated up to 4 weeks after transplanting
crop.


--





Table 1. (Continued)


Lbs./Acre (Active Ingredients) '


to Crop Sandy Soils Muck Soils
Posttransplanting 4 to 6 (total) 4 to 6 (total)
Note: Adjust proportion of each
according to weed species prob-
lem. Do not exceed 3 lb. CDAA
in mixture.
Posttransplanting 4 to 6 4 to 6


Linuron Posttransplanting 1/ to 1


Mineral Posttransplanting 25 to 40


Spirits


Nitrofen


Posttransplanting


Prometryne Posttransplanting


Eggplant DCPA
Endive CDEC
(Escarole and Pronamide
Chicory)


Posttransplanting
Preemergence
Preemergence


gals.


(1 to 3)

(0.8 to 1.6)



10%
2 to 4
( to 12)


Remarks
See footnote (5) at end of table. May be
repeated up to 3 weeks after transplanting
crop.


See footnote (4) at end of table. May be
repeated up to 3 weeks after transplanting
crop.


1/2 to 1 Do not apply when temperature exceeds 850
F. Do not use with a surfactant. Can be
used postemergence to weeds.
25 to 40 Use postemergence to weeds. Apply direc-
gals. tionally to base of crop plants. Do not treat
later than one month after transplanting
crop.
(1 to 3) Apply 1 to 4 weeks after transplanting crop.
Can be used postemergence to weeds.
0.8 to 1.6 Apply broadcast within 2 to 6 weeks after
transplanting. Limited to two applications
per crop. Can be used postemergence to
weeds.
Apply directionally to base of plant.
2 S e footnote (4) at end of table.


- May be applied up to 3 weeks before plant-
ing up to planting. Incorporate immediately
after application.


Besld rpatn o6- Icroae1t 12ice ep


Crops
Celery


Time of
Application


Herbicides
CDAA-CDEC


CDEC


Lettuce


Benefin


Replanting


Bensulide


Preplanting


Incorporate I to 11/2 inches deep.


---


- --


5 to 6








Table 1. (Continued)
Time of Lbs./Acre (Active Ingredients) '
Application
Crops Herbicides to Crop Sandy Soils Muck Soils Remarks
Lettuce CDEC Prcemergence (2 to 4) (2 to 4) See footnote (4) at end of table. Some
varieties and strains of lettuce may be
injured.
Pronamide Preemergence (1 to 11)-
Okra Trifluralin Preplanting % to 1 May be applied up to 3 weeks before plant-
ing up to planting. Incorporate immediately
after application. This treatment can be
used on the marl and rockland soils.
Diphenamid Preemergence 5-
Onions CDAA Preemergence 4 to 6 See footnote (3) at end of table. May be
applied as a postemergence treatment to
onion plants but before emergence of weed
seedlings. Apply directionally to base of
crop plant at second true leaf stage or
later. Do not use on green onions.


CDAA+ Preemergence 6+6 See footnote (3) at end of table.
Chlorpropham
Chlorpropham Preemergence 3 to 4 6 to 8
DCPA Pr emergence 10/ -
DCPA+ Preemergence 6+1
Chlorpropham
DCPA+ Posttransplanting (6+1) Good soil moisture a necessity at time of
Chlorpropham application.
DCPA Posttransplanting 101 -
Chloroxuron Postemergence (3 to 4) Apply when the crop has reached the 2 to
3 leaf stage.
Nitrofen Postemergence (3 to 4) Apply when crop is in the 2 to 3 leaf stage.
(Use wettable powder only).








Table 1. (Continued)
Time of Lbs./Acre (Active Ingredients) '
Application
Crops Herbicides to Crop Sandy Soils Muck Soils Remarks
Peas, CDAA Preemergence 4 4 See footnote (3) at end of table.
English Dinoseb Preemergence 3 6 to 9 CAUTION: Injury may result if heavy
rains follow treatment on sandy soils.
Peas, Trifluralin Preplanting % to 1 May be applied up to 3 weeks before plant-
Southern ing. Incorporate immediately after appli-
cation.
DCPA Preemergence 10/2 CAUTION: May cause injury if rains occur
within 2 weeks after treatment.
Peppers


CONVENTIONAL CULTURE OR WHERE STRIP-MUL
DCPA Posttransplanting 101/2
or postthinning
Diphenamid Preemergence 4 to 5
Posttransplanting


Pretransplanting


/2 to 1


:H IS USED


Plants should be 4 inches tall. Apply di-
rectionally to base of plant.


- May be used on marl and rockland soils,
also. Limited to one application per crop.
- Incorporate within 8 hours after applica-
tion. This treatment may be used on marl
and rockland soils, also.
- Do not apply when plants are wet. This
treatment may be used on marl and rock-
land soils, also.


Trifluralin


Chloramben Posttransplanting









Table 1. (Continued)
Time of Lbs./Acre (Active Ingredients)
Application
Crops Herbicides to Crop Sandy Soils Muck Soils Remarks
Peppers
FULL-BED MULCH SYSTEM: IN-THE-ROW
Diphenamid Preemergence 4 to 5 -A directed band application over the holes
Posttransplanting in the mulch can be used after the seed is
sown or transplants are set.
Trifluralin Preplanting 2 to 1 Incorporate immediately after application.
This treatment may be used on marl and
rockland soils, also.
Potatoes Dalapon Preemergence 7.4 For control of perennial grasses. Apply to
weed foliage and then plow under 2 weeks
later. Do not apply to red-skinned varieties.
Alachlor Preemergence (2) White-skinned potatoes only. Alachlor may
delay maturity and/or reduce yields of some
varieties under certain conditions. Refer to
label.
DCPA Preemergence 10% -
Dinoseb Preemergence 3 to 6 3 to 6 Apply at least one day before crop emerges.
Diphenamid Postemergence 4 to 6
Metribuzin Preemergence () -Do not incorporate. Check label for sensi-
tive crops and subsequent plantings.
Dalapon Postemergence (3.7) Apply after last cultivation where peren-
nial grasses are a problem. Apply direction-
ally to base of crop plants. Do not apply
to red-skinned varieties.
EPTC Postemergence 3 Incorporate immediately after application.
Apply after last cultivation or no later than
45 days before harvest. Suggested for marl
soils, also.
Squash Bensulide Preplanting (5) Incorporate 1 to 1% inches deep in moist
soil. Plant immediately.


soil. Plant immediately.










Time of
Application
Herbicides to Crop '
Chloramben Preemergence
DCPA Postemergence
or
Posttransplanting
DCPA Posttransplanting
Diphenamid Posttransplanting


Crops
Squash




Strawberries



Sweet Corn


Preemerg'ence
Preemergence



Preemer'ence
Preemnergence

Preen-nrwe-ne
Preemergence
Preemergence
Posteimergence

Preemergence

Iostemergence


Postemnergence


(1 to2)
(1 -1z 1)

2 + 2
2+2

1 to 2



'T -
6
1

1 to2

(1 : 1 gal.
in 10 gals.
water/A)
!i to :


Table 1. (Continued)

Lbs./Acre (Active Ingredients)

Sandy Soils Muck Soils
3
10 2


Pants should be established before applica-


(4)
(1' -1)

2 2

(3 to 4) Adequate surface soil moisture is essential
for best results.
5 See footnote (3) at end of table.
3 See footnote (5) at end of table.
1 to 6 See footnote (4) at end of table.
'i to 11, Will control weed seedlings up to 1 inch
tall.
See remark on "atrazine" immediately
above.
(1 1 gal. Use a non-phytotoxic crop oil plus emulsi-
in 40 gals. fier formulated for use with atrazine. Weeds
water/A) should not be over 1 inches in height.
2: to .i Apply directionally to base of crop plants.
Use amine formulation. Some varieties sus-
ceptible to injury. Do not use after start of
ear formation.


Alachlor
Alachlor -
Atrazine
Alachlor+
CDEC
Atrazine

CDAA
CDAA -CDEC
CDEC
Atrazine

Simazine

Atrazine -
Oil

2,1-D


Remarks

Apply at lay-by.








Table 1. (Continued)
Time of Lbs./Acre (Active Ingredients) *
Application
Crops Herbicides to Crop Sandy Soils Muck Soils Remarks
Sweet Diphenamid Posttransplanting 4 Apply immediately after transplanting.
Corn EPTC Posttransplanting 4 to 6 Apply over freshly planted slips no later
than one week after transplanting. Do not
incorporate into soil.
Tomatoes


CONVENTIONAL CULTURE OR WHERE STRIP-MULCH IS USED
Diphenamid Preemergence 4 to 6 -
Posttransplanting
or Postthinning


May be used on marl and rockland soils,
also. Limited to one application per crop.


Pebulate Pretransplanting 4 Incorporate immediately after application
and then transplant.
Trifluralin Pretransplanting % to 1 May be applied up to 3 weeks before trans-
or Postthinning planting up to transplanting or after thin-
ning. Incorporate within 8 hours after ap-
plication. This treatment may be used on
marl and rockland soils, also.
Chloramben Posttransplanting 3 Use granular formulation. Do not apply
when plants are wet. This treatment may
be used on marl and rockland soils, also.
FULL-BED MULCH SYSTEM: IN-THE-ROW
Diphenamid Preemergence 4 to 6 If holes are cut or burned in the mulch
Posttransplanting cover, diphenamid may be directed as a
band over the holes immediately after seed
is sown or transplants are set.






Table 1. (Continued)


Time of
Application
s to Crop '
FULL-BED MULCH SYS


Pretransplanting

Pretransplanting


Lbs./Acre (Active Ingredients)
Sandy Soils Muck Soils Remarks
TEM: IN-THE-ROW
4 Incorporate immediately after application
in band on bed. Install cover and transplant.
%4 to 1 Incorporate in band under the cover within
8 hours after application. This treatment
may be used on marl and rockland soils,
also.


FULL-BED MULCH SYSTEM: ROW MIDDLES OR WHEEL ROWS


Preemergence
(bed-over)


Diphenamid Preemergence


Preplanting


4



4 to 6

5 to 6


- Apply as a band spray over false shoulder
made by mulch layer where mulch is in-
stalled. Cover immediately with soil used
in making finished shoulder.
- Moisture following application needed for
best weed control.
- Incorporate 1 to 1'. inches deep in moist
soil. Plant immediately.


Naptalam Preemergence 3 to 4
(1) All treatments are "[..... i. r... 'to weeds unless stated otherwise under "remarks."
(2) Rates given in ( ) are suggested for trial purposes only.
(3) CDAA is more effective against grasses than broadleaf weeds.
(4) CDEC is more effective against broadleaf weeds than grasses.
(5) Combine CDAA with CDEC for mixed grass and broadleaf weed populations. The amount of either chemical in the mixture
should not exceed the amount suggested for that chemical separately.


Crops

Tomatoes


Herbicides


Pebulate

Trifluralin


Pebulate


Watermelons


Bensulide




















Ind" of Nod md ArLkuIuid f.asq




Tamw:8 I FAS
EARCN

Unvesiy f loid


12-3M-76


COOPERATIVE EXTENSION WORK IN AGRICULTURE AND HOME ECONOMICS
(Acts of May 8 and June 30, 1914)
Cooperative Extension Service, TFAS, University of Florida
and United States Department of Agriculture, Cooperating
John T. Woeste, Dean




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