F POTATO INVESTIGATIONS LABORATORY
PO. /- Hastings, Florida
Mimeo Report POL 71-6 October 1970
CABBAGE AND POTATO INSECT CONTROL IN THE HASTINGS AREA
R. B. Workman, Assoc. Prof. (Assoc. Ent.)
FOLLOW THE DIRECTIONS FOR USE AND SAFETY ON THE PESTICIDE LABEL AT ALL TIMES
INSECTICIDES RECOMMENDED FOR CONTROL OF CABBAGE INSECTS
Insect Insecticide Amount Time Notes
(E-Emulsible) per acre* limit
Dibrom 8E 1 qt. 1 Fast short activity.
Cabbage Cygon 2.67E 1-1 pts. 3 Fast, long activity. Systemic.
aphid Parathion 8E pt. 10 Fair. Regular treatments needed.
Phosdrin 2E 1 pt. 1 Fast, short activity.
Systox 2E 1l pts. 21 Fast, long activity. Systemic.
Meta-Systox-R 2E 1- pts. 24 Ist, long activity. Systemic.
Cabbage Bacillus thur. ** None Only Bacillus cpds. and Lannate
looper, Lannate 90S lb. 7 are effective on loopers. Regular
Other Dibrom 8E 1 qt. 1 treatments are necessary for best
worms, Parathion 8E 1 pt. 10 control so that insects and
Cutworms, Parathion 8E plus 1 pt. + populations do not become large.
Beetles, Toxaphene 8E 1 qt. 14
Stinkbugs Phosdrin 2E 1 qt. 1
M. Cricke Diazinon AG500 1 pt. 7 Drench or spray. Do not increase
Cutworm Parathion E pt. 10 dosage. Burning may result.
(seedbed) Baits Results are often erratic.
Adjust dosage for other formulations.
** BIOTROL, DIPEL, THURICIDE--3-4 lbs, 2-1 lb, 2 qts respectively. Other Bacillus
products may be released shortly. Follow directions on package.
LOOPER CONTROL: Looper damage at Hastings is highest during Nov.-Dec. and Apr.-
May. Special attention is needed at these times. Costs of looper control on late
cabbage have increased over $30 per acre (5-7 times) in the last few years. Missing
an application or using ineffective treatments may result in a loss of control.
Loopers over 3/4 inch long are very difficult to control. 5-6 nozzles per row apply-
ing 100 gals. per acre at 200-300 psi are recommended for sprayers. Insect eggs are
usually deposited on the lower plant parts. Spreader-stickers will aid penetration
when cabbage is near full growth.
LANNATE: Lannate is a 90% soluble powder which drifts easily in the air. Use
care when measuring or dumping in the spray tank. Respirator and goggles should be
worn. A Lannate liquid formulation, tested this spring, was as effective as the
powder. This formulation is not available but may be released later in the season.
CUTWORMS: Cutworms are often present in the soil when cover crops are turned
under. Cabbage transplants are attacked the night after setting. Insecticide sprays
or drenches (watering cart) will reduce the amount of injury. Large cutworms are
difficult to control.
MOLE CRICKETS: Cabbage seedbeds are attractive to insects as they often contain
the only new growth and moist soil in the area. Mole crickets fly and can move some
distance to the seedbed. Treatments must be regular and include an area about the
seedbed so that insects will be killed before reaching it. Drenches work well as
mole crickets contact the pesticides while tunneling through the soil. Sprays are
effective against insects which move about and feed on the surface. Baits ,Orol .
insects which find and eat the bait. Baits are probably broken downa -tHeeA1uekt_ k VU
by light and air followed by sprays and then drenches. \ ~J
300 copies \ \o'0
PACKING CABBAGE: Shipment of cabbage with few or no wrapper leaves would reduce
pesticide residues, time limit before harvest, insect damage, shipping costs, and
leaf removal and disposal at the market. Pesticide pollution problems and rising farm
costs may bring changes.
INSECTICIDE TESTS: Best control of cabbage loopers at the Potato Investigations
Lab. in 1970 were--Dipel (Bacillus), Monitor, Fundal, Azodrin, Phosvel, Lannate, and
Thuricide (Bacillus). Parathion, Phosdrin, and Toxaphene were not effective.
INSECTICIDES RECOMMENDED FOR CONTROL OF IRISH POTATO INSECTS
Insect Insecticide Amount Time Notes
(E-Enulsible) per acre* limit
Aphids Cygon 2.67E 1- pts. None Aphids on potatoes are resistant to
Meta-Systox-R 2E I1 pts. 7 DDT, Parathion, Phosdrin, and
Systox 2E 1jl pts. 21 Thiodan.
Armyworms, Parathion 8E 2 pt. 5 Spray up to 1 week of digging
Cutworms, Phosdrin 2E 1-2 pts. 1 for cutworms and tuberworms.
Tuberworm, Thiodan 2E 1-2 qts. None
Other Worms Toxaphene 8E 1-2 pts. None
Leaf-Footed Guthion 2E 1 qt. 7 Guthion reported good on
Plant Bug, Parathion 8E i pt. 5 tuberworm.
Green Phosdrin 2E 1 pt. 1
Stinkbug Thiodan 2E 1-2 qts. None
Wireworm Diazinon AG500 1-2 qts. None Preplant soil treatment. See
_Parathion 8E 1 qt. None granulars under "Wireworms" below.
Leafminer May be numerous at harvest but rarely cause damag_.
* Adjust dosage for other formulations.
GENERAL POTATO INSECTS: Major insect damage to potatoes the past few years has
been from cutworms and tuberworms. Damage is usually associated with greening,
indicating exposure of tubers to the surface. Deeper hilling will reduce losses from
all three sources. Insecticides should be applied from blossoming, when tuber forma-
tion begins, until harvest. After tuber formation, cutworms tend to feed below the
soil surface where control is difficult. Grubworms are white "C"-shaped worms which
cause tuber damage much like that of cutworms. Few grubworms, however, are found in
the Hastings area. The adults are large beetles. Beet armyworms and soybean loopers,
usually rare to the Hastings area, caused heavy leaf damage to potatoes and several
other crops in Florida last year. Control was difficult at all locations. Damaging
numbers may not develop this season.
WIREWORMS: Wireworm damage to potatoes has been low for a number of years. Light
trap catches of the adults (beetles) during July-Sept. 1970 have been the highest
in 12 years. Adult numbers do not necessarily mean that damage will occur, however,
a possibility is present. Growers should check their fields before planting and if
wireworms appear common, 2-7 per square foot in the top inch or so of soil on the
rows, control measures should be considered. DD or EDB will probably give only
partial control as the wireworms inhabit the top layer of soil where fumigants.are
less effective. Granular pesticides are effective and the first 2 include nematode
control: Dasanit, Furadan, Diazinon, Di-Syston, Dyfonate, Parathion, and Thimet.
These materials have not all been tested in Florida due to low wireworm numbers
and are suggested for trial only. Follow the directions on the label. Best control
requires good mixing in the upper 6 inches of soil.
PARAQUAT: Data are unavailable on the mixing of Paraquat with insecticides. Dead
vines are probably unattractive to egg-laying moths. Further insect damage should
not develop on potatoes which have been kept clean during the season.
INSECTICIDE TESTS: Best control of aphids on potatoes in 1970--Monitor, Furadan,
Azodrin, Meta-Systox-R, and Systox.
POL 71 6 Page 2