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Title: Chemical weed control for Florida vegetable crops
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Permanent Link: http://ufdc.ufl.edu/UF00084552/00001
 Material Information
Title: Chemical weed control for Florida vegetable crops
Alternate Title: Circular 196 C ; Florida Cooperative Extension Service
Physical Description: Book
Language: English
Creator: Montelaro, James
Publisher: Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida,
Publication Date: September, 1970
Copyright Date: 1970
 Record Information
Bibliographic ID: UF00084552
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: 214098900 - OCLC

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    Table of Contents
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    Back Cover
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Full Text


CIRCULAR 196 C


CHEMICAL WEED CONTROL


Revision of
no. 96
Ocp^U j!jr7


FOR FLORIDA


VEGETABLE CROPS


MAR 17 1371


Univ. of F!orida


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

















CONTENTS


Page
Introduction ......................... .. ........ .......... ..... ....... ... ..... 3

Definition of Term s .- .......-.-.....-. ..-.... ....... ........... ..... 3

Precautionary M measures ............ ... .. ......... ................................... 4

General Rules .............. ........................ ... .. .. .....-....... 4

Equipm ent for Application ......... .. ......... ... ... ............... 5

Calibration of Sprayer ......................... ................... ............... 5

Cleaning the Sprayer ........-.......- .. .. ..................... ........... ........... 6
Common Trade Names of Herbicides ..-......... .................... ....-. .... 7

Table 1. Herbicides for Vegetable Crops-Timing and Rates on
Florida Soils ............-- .... ........~....... ..-.... ..- 9- 19



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 exclusion
of others of suitable composition.


Prepared by James Montelaro and M. E. Marvel in cooperation with
personnel of the University of Florida, Institute of Food and Agricultural
Sciences. Special assistance was provided by Mr. D. S. Burgis, Dr. S. J.
Locascio, Dr. J. R. Orsenigo, Dr. W. T. Scudder, Dr. R. W. Harkness and
Dr. J. R. Shumaker in the preparation of this manuscript.


September, 1970







CHEMICAL WEED CONTROL FOR
FLORIDA VEGETABLE CROPS

Introduction
Weed control by use of chemicals in vegetable production is
a relatively new agricultural practice. It offers great promise as
a means of reducing the cost of growing vegetables by lessening
the need for cultivation and hand labor.
The effectiveness of herbicides may vary under different
soil and climatic conditions. For that reason, the grower is
warned to proceed with caution in introducing new chemical
weed control practices on any vegetable crops.
It is the purpose of this guide to assemble the information
that is available on chemical weed control for vegetable crops.
Literature describing each chemical is available from the manu-
facturer. For additional details on use of herbicides, consult
your County Agent.

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 directionallyy). an application to restrict-
ed area, such as a row or bed at the base of plants.
Herbicide. -a phytotoxic 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
herbicide 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







emulsifiability, spreading, wetting, dispersibility or other sur-
face-modifying properties.
Spray drift. the movement of airborne spray particles from
the intended area of application.
Weed.- a plant growing where it is not desired.
Weed control. the process of limiting weed infestations so that
crops can be grown profitably or other operations can be con-
ducted efficiently.
Precautionary Measures
Read the Label
* Many weed control chemicals are poisonous and are potentially
dangerous to man and animals. Follow safety precautions
given by the manufacturer.
* Be sure the chemical is approved for use on the crop to
be treated. Follow rate and time schedule on the label as
approved by the U. S. Department of Agriculture. Do not use
chemicals that do not have such approval.
Test New Chemicals on a Limited Scale
* Before attempting wide-scale use of any new weed control
chemical, it should be tested on a small scale for one or more
seasons.
Avoid Drift of Herbicides to Adjoining Areas
* Care should be taken to prevent any herbicide from drifting
to adjoining areas where they may be hazardous to crops and
animals. To avoid drift hazards use low pump pressure, set
spray boom close to the ground and apply only during periods
of low wind velocities. Precautions should be taken to avoid
pollution of water and soil in adjoining areas.

General Rules
Rule 1 Know Your Weeds
The various species of grasses and broadleaf weeds differ con-
siderably in susceptibility to a specific herbicide. Weeds are
killed more readily during the period of germination or during
the early stages of growth.
Rule 2 Know Your Chemicals
Familiarize yourself with the following before using a new
herbicide:
Pontential hazards to handlers and farm animals.






o Degree of susceptibility of each crop.
Resistance of each weed.
o Restrictions on rates, timing and crops for which approved.
o Peculiarities specific to each herbicide. Some have a long
residual effect and may limit subsequent crops. For pre-
emergence weed control, it is especially important that the
seedbed be prepared properly before treatment with herb-
icides. The seedbed should be firm, smooth and free of
crop residues.
Good soil moisture is necessary for most preemergence herb-
icides to be effective.
After an herbicide is applied, the treated soil should not be
disturbed 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 spraying. Many
types of sprayers can be used, provided they have good agitation
in the tank and have pump capacity to deliver the necessary
number of gallons per acre. When using wettable powders, good
agitation is especially important.
The boom and nozzles should be designed for easy adjustment.
Nozzle tips delivering a fan-type spray pattern are generally
used for application of herbicides. Nozzle tips (and strainers)
should deliver the desired fan pattern and also be suited to pump
capacity and tractor speed. Check with your equipment dealer
to avoid guess-work in selecting proper nozzles.
Equipment for application of granular materials is available
from a number of manufacturers. This equipment is generally
easier to maintain than sprayers, but it does require periodic
service, adjustments and calibration.

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.
Before each specific job, adjust the nozzles, clean the screens
and calibrate the sprayer in the field on the tractor that will
be used with it. For overall soil coverage, adjust the boom so
that fan-type spray nozzle coverage overlaps one third at ground
level for preemergence 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 band







desired. Usually, 8 to 12-inch bands are used. Calibrate 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 48-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 checking the rate of application, fill the
tank with water, then run the sprayer for 660 feet at the speed
and pressure to be used in actual operation; then, re-fill tank
with a measured amount of water to determine the number of
gallons of solution used. Measure width of actual area sprayed.
(For band application, this is the equal to the sum of the widths
of all the bands.) Then calculate as follows:

Gallons used X 66
----------- = gallons per acre
Width of sprayed area in ft.

12 gal. X 66
= 33 gallons per acre*
24 ft.

Any change in tractor speed, pressure setting, nozzle size or
band width changes the rate of application and recalibration
will be necessary.
For detailed information on calibration of sprayer and gran-
ular 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 cannot be
removed completely from wooden tanks or corroded metal parts.
Never use this equipment for other purposes-such as applica-
tion of insecticides, fungicides and liquid fertilizers. Never
allow the spray solution to remain in the tank for long periods.
If it is absolutely necessary to use herbicide equipment for
other spraying, try the following cleaning procedures:
1. Use soap or detergent solutions for removing non-hormone
type weed killers.
*This amount of spray will cover one acre overall. In the case of spraying
12" bands over row 48" 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 to the tank and bring the volume up
to 33 gallons with water.







2. Hormone-type weed killers, such as 2,4-D, require chemical
cleaning.
A. To remove water-soluble salt formulations, 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 gal-
lons 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 thoroughly 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
dinoseb 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.

Common and Trade Names of Herbicides
Common Names Trade Names
Allyl Alcohol ..-........-....... ~ -..-..- A-A Weed Seed Killer
A m iben ..... .. ..... ......... -. -----.. -- -- -. V egiben
A trazine ............. . ......... ......... ... ..---..... A A trex
Benefin .... ........... .... ..... ..-... ... ......- . .... Balan
Bensulide -....--... - .. ------- --.. Prefar
CDAA .... ...... ............... . ......-- --.. ...- Randox
C D E C .................. ....... .......... ...-------- --..-.. V egadex
Chloropicrin ........ --...... .... .......--- -. ..... Larvacide, Picfume
Chloropropham -......... ----- ---..-- ..-- Chloro-IPC
Chloroxuron ........._ .................. .. .. Tenoran
Dalapon ............... .. .......... .... .... .. .. Dowpon








Diphenamid ...... Dymid, Enide
Dinoseb ... ...... ... . .. Premerge, Sinox PE
EPTC ..... Eptam
Linuron ......... -..... ..- ...... .. Lorox
Methyl Bromide ...-. .. Several Brands
Mineral Spirits .... .. .... Several Brands
Nitralin ............ ..... -..... .... -.. Planavin
Nitrofen ..-............-. .......... .... -.... ..... TOK
NPA (Sodium salt) -------........ .............. .............Alanap
Pebulate ........ ....~~............. .. .. ..... Tillam
Prometryne .- .......... -- ........ .... Caparol
Propachlor ...............--..... Ramrod
Sim azine ...............-..........-- ----- ...... .. Princep
SMDC ............................ Vapam, VPM Soil Fumigant
Trifluralin .................. ..... Treflan
2,4-D (amine salts) ......... .. ... Several Brands


Instructions for Use of Herbicide Table
The table that follows lists weed control treatments that have
shown good results in Florida experiments. Always check con-
tainer label for recent changes regarding crops and rates ap-
proved by the U. S. Department of Agriculture and the Food
and Drug Administration. Chemicals and rates listed without
parentheses under each soil type have been tested quite thor-
oughly and are, therefore recommended for use. 'Those in paren-
theses have not been thoroughly tested, or have been less depend-
able and, therefore, can only be 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
rates of the soil fumigants allyl alcohol, methyl bromide, and
SMDC are stated in terms of their commercial formulations.
These materials are applied alone or as water drenches; not as
sprays.


DCPA


Dacthal





TABLE 1.-HERBICIDES FOR VEGETABLE CROPS-TIMING AND RATES ON FLORIDA SOILS
Time of
Application Lbs./Acre (Active Ingredients)
Crops Herbicides to Crop1 Sandy Soils Muck Soils Remarks
Beans, Bush EPTC Preplanting 3 Incorporate immediately after ap-
and Pole plication.

Nitralin Preplanting () -May be incorporated by irrigation
and rain or mechanically incorpo-
rate 1 to 1% inches deep within 2
days following application.

Trifluralin Preplanting 1 to 3 May be applied up to 3 weeks be-
fore planting. Incorporate immedi-
ately after application. Use lower
rate on light sands and higher rate
on dark sands. The lower rates may
be used on rockland and marl soils.

CDAA Preemergence 4 to. 6 See footnote (2) at end of table.
CDEC Preemergence 4 to 6 4 to 6 See footnote (3) at end of table.

CDAA + CDEC Preemergence 4 to 6 4 to 6 CDAA rate should not exceed 3 lbs.
on sandy soils. See footnote (4)
at end of table.

Dinoseb Preemergence 3 6 CAUTION: Injury may result if
heavy rains follow treatment on
sandy soil.

DCPA Preemergence 10% -

EPTC Postemergence 3 to 4 At lay-by, apply directionally to
base of plants and incorporate
lightly into soil.







Table 1. (Continued)
Time of
Application Lbs./Acre (Active Ingredients)
Crops Herbicides to Crop' Sandy Soils Muck Soils Remarks
Beans, Lima Trifluralin Preplanting %/ to % May be applied up to 3 weeks before
planting. Incorporate immediately
after application. Use lower rate
on light sands and higher rate on
on dark sands.
CDAA Preemergence (4) (4) See footnote (2) at end of table.
CDEC Preemergence 4 to 6 4 to 6 See footnote (3) at end of table.
CDAA & CDEC Preemergence 4 to 6 4 to 6 See footnote (4) at end of table.
DCPA Preemergence 101 -
Beets CDEC Preemergence 4 4 See footnote (3) at end of table.
Broccoli, Nitralin Preplanting (%) May be incorporated by irrigation


0 Cabbage,
Cauliflower,
Collards,
Kale


and rainfall or mechanically incor-
porate 1 to 11/ inches deep within
2 days following application. Not
approved for use on collards and
kale.
Trifluralin Preplanting % to 1 May be applied up to 3 weeks be-
fore planting or transplanting.
Incorporate immediately after ap-
plication. Use lower rate on light
sands and higher rate on dark
sands.
CDAA Preemergence 4 4 See footnote (2) at end of table.
(Seedbed or Not approved for use on broccoli,
field) cauliflower, collards and kale.
CDEC Preemergence 4 to 6 4 to 6 See footnote (3) at end of table.


(Seedbed or
field)


CDEC rate should not exceed 4 lbs.
on collards and kale.


b.=






CDAA + CDEC Preemergence 4 to 6 4 to 6 See footnote (4) at end of table.
(Seedbed or Not approved for use on broccoli,
field) cauliflower, collards and kale.
Nitrofen Preemergence (4 to 5) Good soil moisture is important. If
dry, overhead irrigate after treat-
ing. Not approved for collards and
kale.

DCPA Preemergence 10% -
CDAA Posttransplanting 4 4 See footnote (2) at end of table.
Use preemergence to weeds. Apply
as a directed spray to base of
plants. Not approved for use on
broccoli, cauliflower, collards and
kale.

CDEC Posttransplanting 4 to 6 4 to 5 See footnote (3) at end of table.
Apply as a directed spray. Not
approved for use on collards and
kale.

CDAA + CDEC Posttransplanting 4 to 6 4 to 5 See footnote (4) at end of table.
Apply as a directed spray. Not
approved for use on broccoli, cauli-
flower, collards and kale.

DCPA Posttransplanting 10/ Apply immediately after trans-
planting.
Nitrofen Postemergence (1 to 2) (1 to 2) Wait 7 to 10 days after transplant-
or ing before applying nitrofen. See
Posttransplanting remarks under preemergence treat-
ment of these crops. May cause
foliar injury to young plants. Some
cabbage hybrids are less tolerant
than other hybrids.
Rates given in ( ) are suggested for trial purposes only.







Table 1. (Continued)

Time of
Application Lbs./Acre (Active Ingredients)
Crops Herbicides to Crop1 Sandy Soils Muck Soils Remarks

Mustard, Trifluralin Preplant / May be applied up to 3 weeks be-
Turnips fore planting. Incorporate immedi-
ately after application.
DCPA Preemergence 10/ -

Cantaloupes, Bensulide Preplant 5 Incorporate 1 to 11/ inches deep
Cucumbers in moist soil. Plant immediately.
NPA Preemergence 3 to 4 -Surface soil must be moist at time
of treatment to insure good
results.

NPA Postemergence 3 to 4 Do not use on cucumbers.
DCPA Postemergence 101/2 Apply 4 to 6 weeks after seeding.
Carrots, Chloroxuron Postemergence (2 to 3) (3 to 4) Apply overtop after 2 to 4 true
Parsley leaves form. Do not apply within
60 days of harvest. Not approved
on parsley.
Nitrofen Postemergence ( 1 to 2) (1 to 3) Apply overtop after 2 to 4 true
leaves form.
Mineral Spirits Postemergence (40 to 60 (40 to 60 Apply at 3-leaf stage.
gals.) gals.)
Linuron Postemergence 1/ to 1 /4 to 1 May be used with a surfactant.
Apply overtop after 4 true leaves
form. Not approved for use on
parsley.,
Celery Allyl Alcohol Presceding in (25 gals.) (40 gals.) Apply in water drench 2 days be-
seedbeds fore seeding. Controls weeds only.




Chloropicrin Preseeding in 1.3 pts./ 1.3 pts./ Gives good nematode and disease
seedbeds 100 sq. ft. 100 sq. ft. control, but poor control of weeds.

Methyl Bromide Preseeding in 2 lbs./100 2 lbs./100 Cover with plastic film.
seedbeds sq. ft. sq. ft.

SMDC Preseeding in 50 to 75 100 gals. Apply in water drench.
seedbeds gals.

Prometryne Postemergence 0.8 0.8 Apply broadcast to seedbeds after
in seedbeds crop reaches 2-5 true leaf stage and
weeds are less than 2 inches high.
Only one application per year.
CDAA Posttransplanting 4 4 See footnote (2) at end of table.
May be repeated up to 4 weeks
after transplanting crop.
CDEC Posttransplanting 4 to 6 4 to 6 See footnote (3) at end of table.
May be repeated up to 3 weeks
after transplanting crop.
CDAA + CDEC Posttransplanting 4 to 6 4 to 6 See footnote (4) at end of table.
May be repeated up to 3 weeks
after transplanting crop.
Nitrofen Posttransplanting (1 to 3) (1 to 3) Apply 1 to 4 weeks after trans-
planting crop.
Mineral Spirits Posttransplanting 25 to 40 25 to 40 Use postemergence to weeds.
gals. gals. Apply directionally to base of crop
plants. Do not treat later than one
month after transplanting crop.
Prometryne Posttransplanting (0.8 to 1.6) (0.8 to 1.6) Apply broadcast within 2 to 6 weeks
after transplanting. Limited to two
applications per crop.

Eggplant DCPA Posttransplanting 101/ Apply directionally to base of
plant.
Rates given in ( ) are suggested for trial purposes only.







Table 1. (Continued)

Time of
Application Lbs./Acre (Active Ingredients)
Crops Herbicides to Crop1 Sandy Soils Muck Soils Remarks

Endive CDEC Preemergence 2 to 4 2 See footnote (3) at end of table.
(Escarole
and
Chicory)
Lettuce Benefin Preplanting / May be applied up to 3 weeks be-
fore planting up to planting. Incor-
porate immediately after applica-
tion.

Bensulide Preplanting 5 to 6 Incorporate 1 to 11/ inches deep.
DCPA Preplanting 10.5 Apply to soil, incorporate and plant
immediately.
CDEC Preemergence (2 to 4) (2 to 4) See footnote (3) at end of table.
Some varieties and strains of let-
tuce may be injured.
Okra Trifluralin Preplanting 3/ to 1 -May be applied up to 3 weeks be-
fore planting up to planting. Incor-
porate immediately after applica-
tion. Use lower rate on light sands
and higher rate on dark sands. This
treatment can be used on the marl
and rockland soils.
Diphenamid Preemergence 5 -
Onions CDAA Preemergence 4 to 6 4 to 6 See footnote (2) 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,





Chloropropham Preemergence 3 to 4 6 to 8

CDAA + Preemergence 6 + 6 See footnote (2) at end of table.
Chloropropham

DCPA Preemergence 10% /

DCPA + Preemergence 5+1 -
Chloropropham

DCPA + Posttransplanting (5 + 1) -
Chloropropham
l ti 10 --


uCrA rPuosttranlJspian ngII

Peas, CDAA Preemergence 4 4 See footnote (2) at end of table.
English Dinoseb Preemergence 3 6 to 9 CAUTION: Injury may result if
heavy rains follow treatment on
sandy soils.

I XT, .-I; P-ni+i,+ (/ 1 Mav be incorporated by irrigation


and rainfall or mechanically incor-
porate 1 to 1%/ inches deep within
2 days following application.


Trifluralin Preplanting % to 1 May be applied up to 3 weeks be-
fore planting. Incorporate immedi-
ately after application. Use lower
rates on light sands and higher
rates on dark sands.

DCPA Preemergence 10% CAUTION: May cause injury if
rains occur within 2 weeks after
treatment.


Rates given in ( ) are suggested for trial purposes only.


1-1


C Sueas,
Southern


Peppers


Diphenamid Preemergence 5 -

Nitralin Pretransplanting (1/) See Southern peas above.


i


p1 b "


J ra n Hi







Table 1. (Continued)

Time of
Application Lbs./Acre (Active Ingredients)
Crops Herbicides to Crop1 Sandy Soils Muck Soils Remarks

Peppers Trifluralin Pretransplanting 3/ to 1 May be applied up to 3 weeks up to
transplanting. Incorporate immedi-
ately after application. Use lower
rate on the light sands and higher
rate on dark sands.
DCPA Posttransplanting 10 Plants should be 4 inches tall.
or postthinning Apply directionally to base of
plant.
Diphenamid Posttransplanting 4 Apply directionally to base of
plant.
Amiben Posttransplanting 3 Use granular formulations only.
Do ,not apply when plants are wet.
SPotatoes Dalapon Preplanting 7.4 For control of perennial grasses.
Apply to weed foliage and then
plow under 2 weeks later.
EPTC Preemergence 4 to 6 Incorporate and plant immediately
or incorporate just before plants
emerge. Suggested for use on marl
soils, also.
CDAA + CDEC Preemergence 3 + 3 3 + 3 See footnote (4) at end of table. If
not used preemergence, this com-
bination may be used at lay-by.
CDAA and CDEC may be used
separately pre or postemergence.
DCPA Preemergence 10/ -
Dinoseb Preemergcnce 3 to 6 3 to 6 Apply at least one day before crop
emerges.
Diphenamid Preemergence 4 to 6 -





Dalapon Postemergence (3.7) Apply after last cultivation where
perennial grasses are a problem.
Apply directionally to base of crop
plants. Do not apply to red-skinned
varieties.

EPTC Postemergence 4 Incorporate immediately after ap-
plication. Apply after last cultiva-
tion or no later than 45 days before
harvest. Suggested for marl soils,
also.

Squash Bensulide Preplanting (5) See note under cantaloupes and
cucumbers.

Amiben Preemergence 3 -
DCPA Postemergence 10/2 Apply at lay-by.
or
Posttransplanting

Strawberries DCPA Posttransplanting 9 -


Posttransplanting


- Plants should be
application.


established before


CDAA Preemergence 5 See footnote (2) at end of table.
CDEC Preemergence 6 4 to 6 See footnote (3) at end of table.
CDAA + CDEC Preemergence 6 4 to 6 See footnote (4) at end of table.
Propachlor Preemergence 4 to 5 (4 to 5)
Atrazine Preemergence 1 to 2 (3 to 4) Adequate surface soil moisture is
essential for best results.

Simazine Preemergence 1 to 2 See remark on "atrazine" immedi-
ately above.

Atrazine Postemergence 1 /4 to 11 Will control weed seedlings up to
1 inch tall.


Diphenamid


Sweet Corn


Rates given in ( ) are suggested for trial purposes only.


--I


"-1










Table 1. (Continued)

Time of
Application Lbs./Acre (Active Ingredients)
Crops Herbicides to Crop' Sandy Soils Muck Soils Remarks

Sweet Corn Atrazine + Oil Postemergence (1 + 1 gal. (1 + 1 gal. Use a non-phytotoxic crop oil plus
in 40 gals. in 40 gals. emulsifier formulated for use with
water per water per atrazine. Weeds should not be over
acre) acre) 1% inches in height.

2,4-D Postemergence 1/ to %a 1/ to % Apply directionally to base of crop
plants. Use amine formulation.
Some varieties susceptible to in-
jury.

Sweet Diphenamid Posttransplanting 4 -Apply immediately after trans-
Potatoes planting.
EPTC Posttransplanting 4 to 6 Apply over freshly planted slips
no later than one week after trans-
planting. Do not incorporate into
soil.

Tomatoes Diphenamid Preemergence 4 to 6 May be used on marl and rockland


posttransplanting
or postthinning


soils, also. Limited to one applica-
tion per crop.


Nitralin Pretransplanting (') -May be incorporated by irrigation
and rainfall or mechanically incor-
porate 1 to 11/2 inches within 2
days following application.

Pebulate Pretransplanting 4 Incorporate immediately after ap-
plication and then transplant.




Trifluralin


Posttransplanting


3/ to 1


Pretransplanting
or postthinning


- Use granular formulation. Do not
apply when plants are wet. This
treatment may be used on marl and
rockland soils also.


Watermelons Bensulide Preplanting (5 to 6) Incorporate 1 to 1% inches deep in
moist soil. Plant immediately.

NPA Preemergence 3 to 4

Rates given in ( ) are suggested for trial purposes only.
to (1) All treatments are "preemergence" to weeds unless stated otherwise under "remarks."'
(2) CDAA is more effective against grasses than broadleaf weeds.
(3) CDEC is more effective against broadleaf weeds than grasses.
(4) 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.


- May be applied up to 3 weeks be-
fore transplanting up to transplant-
ing or after thinning. Incorporate
immediately after application. Use
lower rate on light sands and higher
rate on dark sands. This treatment
may be used on marl and rockland
soils, also.


Amiben


-- I







FEB 1 0 1977






























































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




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