Title: Cabbage and potato insect control in the Hastings area
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 Material Information
Title: Cabbage and potato insect control in the Hastings area
Physical Description: Book
Creator: Workman, Ralph B.
Publisher: Agricultural Research Center,
Copyright Date: 1971
 Record Information
Bibliographic ID: UF00076386
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: 145587692 - OCLC

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P. ' ?


AGRICULTURAL RESEARCH CENTER


: Hastings, Florida

Mimeo Report POL 71-13

CABBAGE AND POTATO INSECT CONTROL IN THE
R. B. Workman, Assoc. Entomol

FOLLOW ALL DIRECTIONS FOR USE AND SAFETY ON THE PESTICIDE


Insect Insecticide
(E-Emulsible)
Dibrom 8E
Dimethoate 2.67E
Cabbage Meta-Systox-R 2E**
aphid Parathion 8E
Phosdrin 2E
Systox 2E
Bacillus Cpds


Amount/
acre*
1 qt.
l-1 pts
1< pts.
pt.
1 pt.
1l pts.
***


Cutoff
(days)
1
. 3
24
10
1
21
None


Notes


Fast, short activity.
Fast, long activity. Systemic.
Fast, long activity. Systemic.
Fair, Regular treatments needed.
Fast, short activity.
Fast, long activity. Systemic.
See Below.____ _


Cabbage Fundal 4E 1 pt. 14 Effective only against eggs and small
looper Galecron 4E 1 pt. 14 loopers. Regular treatments necessary.
Lannate 90S :z-1 lb. 1 Large loopers not controlled by 1 lb.
Dibrom 8E 1 qt. 1 Compounds for loopers will control
Other Parathion 8E pt. 10 most species except some cutworms.
foliage Parathion 8E + pt. + Large cutworms are difficult to control.
worms, Toxaphene 8E 1 qt. 14
cutworms Phosdrin 2E 1 qt. 1
M.Cridket Diazinon 4E 1 pt. 7 Drench or spray. Do not increase dosage.
cutworm Parathion 8E pt. 10 Burning may result.
(seedbed) Baits Results may be erratic.


* Adjust dosage for different formulations (2E, 4E, 8E, WP. Etc.)
** Do not apply more than 3 times per season.
***BIOTROL, DIPEL, THURICIDE: All products contain the latest strain of Bacillus.
Formulations are different. Follow the dosage rate on the package. In general low
rates will be adequate for low to medium infestations while high rates are for large
populations.
LOOPER CONTROL: Loopers are most damaging during the warmer months before and
after Dec.-Feb. Regular treatments with good coverage give the best control. Bacillus
cpds. at higher rates in tests last season gave excellent control of large loopers.
DIAMONDBACK MOTH: A season-long problem last year. Green to yellow worms, 1/3 in.
long, feed in the bud of the plant making small holes. Control can be difficult due
to protection by the curled leaves. Insecticides for loopers and foliage worms will
give control.
BEET ARMYWORM: Light green to near black worms, to 1 in. long, feed in the bud and
developing head. Control is difficult due to poor pesticide penetration. Also attacks
potatoes. Common the last 2 years. Lannate gave excellent control in tests.
CABBAGE APHID: A serious season-long problem last year. Favorable developmental
conditions for the insects were probably responsible rather than insecticide resis-
tance. Systemic insecticides applied during the "cupping" stage will usually give
season-long control. Aphid-covered heads are impossible to clean up. Aphid spread
from these plants to other heading plants in the field, however, is usually limited.
TEMPERATURE AND INSECT CONTROL: Brown, Insect Control by Chemicals p. 243, states
that best results with insecticides will be obtained when application is made under
warm conditions, followed by a period of cooler temperature. Insects are most active
during warm periods. They can contact and ingest large amounts of an insecticide.
When it is cooler, life processes of the insect slow down, making it difficult to
eliminate the poison. Weather records at Hastings show that daily temperatures vary
enough during the growing season that these conditions are met most of the time.


10-28-71
300 Copies


II fill






In general, when insects are a problem, insecticides can be applied without con-
cern about temperature. Most insecticides are effective for several days on the
crop. Wait, at least, a couple of days after application to appraise control.

RECOMMENDATIONS FOR CONTROL OF IRISH POTATO INSECTS

Insect Insecticide Amount Cutoff
(E-Emulsible) per acre* (days)
Azodrin 3.2E 20 oz. 7 Aphids on potatoes are resistant
Aphids Dimethoate 2.67E l1 pts. None to DDT, Parathion, Phosdrin, and
Meta-Systox-R 2E 1:- pts. 7 Thiodan.
Systox 2E 1l pts. 21
Armyworms, Azodrin 3.2E 20-40 oz. 7 Spray up to 1 week of digging
Cutworms, Lannate 90SP 8 oz. 14 for cutworms and tuberworms.
Tubervorm, Parathion 8E pt. 5 Hilling deeper protects tubers
Other Worms Phosdrin 2E 1 pt. 1 from insects.
Thiodan 2E 1-2 qts. None
Leaf-Footed Guthion 2E 1 qt. 7 Guthion effective on tuberworms.
Plant Bug, Parathion 8E pt. 5
Green Phosdrin 2E 1 pt. 1
Stinkbug Thiodan 2E 1-2 qts. None
Wireworm Diazinon 4E 1-2 qts. None Preplant soil treatment. See
Parathion 8E 1 qt. None "Wireworms" below.
Leafminer 1ay be numerous at harvest but rarely cause damage.
* Adjust dosage for other formulations.
WIREWORMS: Wireworm numbers have been low at Hastings for a number of years
making field evaluation of insecticides difficult. Other insecticides which have
been effective in tests and are registered for use are: Dasanit, Di-Syston, Dyfonate
and Thimet. Follow directions on the label.
WORMS: Cutworms and tuberworms have been causing the most damage to tubers the
past few years, although, damage was low in most sections. Foliage applications of
insecticides starting at tuber formation reduced damage 50-65% in tests last season.
Cutworm moths lay eggs on foliage and soil. Before tuber formation, cutworms hide
in the soil and feed on the foliage, usually, at night. After tuber formation,
cutworms tend to feed under the soil surface where control is difficult. Tuber-
worms mine leaves and stems. During dry weather, soils tend to crack open ex-
posing the tubers to egg laying by the small, gray, tuberworm moths. Tuberworms
often become a serious problem during drouths.
BEET ARMYWORM AND CABBAGE LOOPER: These insects have made the holes in potato
leaves the last 2 seasons. Potatoes can probably withstand some defoliation with-
out yield loss. Bacillus compounds have given the best control of large loopers
while Lannate has been best on beet arrrrworms. Azodrin is effective on loopers.
GREEN PEACH APHIDS: Large numbers of aphids plagued potatoes last season.
Control on slow growing and older plants with systemic insecticides was difficult
due to limited pesticide movement in these plants. Systemics work best on vigor-
ously growing plants. Azodrin is a contact insecticide (nonsystemic) and requires
good coverage for best results. Insecticide coverage on the lower leaves of the
plant, where aphid populations develop, can be improved with drop nozzles and
spreader-stickers.


POL 71-13 Page 2




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