POTATO INVESTIGATIONS LABORATORY
POL 66-3* Per 1965
CABBAGE, CORN, AND POTATO INSECT CONTROL IN THE A t
R. B. Workman, Assistant Entomologist
Use latest insecticide recommendations available. Discard old reports. Follow the
safety precautions on the insecticide label at all times. Make sure that agricul-
tural poisons are not taken for home use. You may be held liable.
CABBAGE INSECTS: Most insect damage occurs early and late in the season when temper-
atures are higher. Thorough insecticide coverage is as important as the chemical
used and means better control at less cost. High dosages may leave illegal residues
on the crops. Fewer wrapper leaves will reduce insecticide residues on the harvest-
ed heads. Do not add excessive leaves to fill out the pack. Large horizontal
leaves should be, especially, eliminated as insecticide runoff tends to collect on
Cabbage aphids and loopers are difficult to control on older plants. Large leaf
surfaces protect them from sprays and systemic insecticides do not translocate
readily. Best coverage is needed at the inner and lower leaf area. Six nozzles per
row are essential with two overhead nozzles aligned with the row and about a foot
aport. One hundred gallons per acre and 300 psi give good penetration and move
lower leaves about for better coverage. Spreader-stickers will aid insecticide
penetration at this time but are not necessary when plants are small.
Green peach aphids are controlled by sprays for cabbage aphids. Disc cabbage under
after the last cutting to prevent build up and migration to potatoes.
INSECTICIDES RECOMMENDED FOR CONTROL OF CABBAGE INSECTS IN THE HASTINGS AREA
Insect Insecticidel Amount i Minimum days j Notes
(E=Emulsible) per acre before harvest
Dibrom 8E 1 pt. 4 j Fast, short activity.
Cygon 2.67E 1-1l pts. 21 Fast, long activity.
Cabbage Parathion 4E -1 pt. 7-- pt., 10-1 pt. Regular applications needed.
Phosdrin 2E 1 pt. 1 iFast, short activity.
__Systox 2E 1- pts. 21 Fast, long activity.
DDT 2E plus 2 qts. + 21 Fewer wrapper leaves will
Cabbage Toxaphene 8E 1 qt. give lower residues.
looper, Dibrom 8E 1 qt. 4 Effective on loopers.
Cutworms Parathion 4E 1 pt. 10 Excellent in 1965 looper tests
Rarathion 4E+ 1 pt. + 14 Fewer wrapper leaves will
Toxaphene 8E 1 qt. give lower residues.
Phosdrin 2E 1I -2 pts. 1 Higher dosage for loopers.
Preplant soil treatment (spray).
Preplant drench--4 oz. per 100
gals. per 1000 sq. ft.
10ne pint of Diazinon AG500 or parathion 4E in 400 gallons of water per acre, as a
drench, has given good control of cutworms and mole crickets about cabbage seed beds
and transplants. Chlordane-Toxaphene baits are still effective against moke crickets.
Apply baits in the late afternoon.
- ~-- -
CORN INSECTS: Chief corn insects at Hastings are budworms, earworms, stink bugs,
and various kernel destroying insects. High clearance sprayers are necessary for
effective control. Ensilage corn is cheaper to raise because fewer pesticide appli-
cations are required. Insects attacking the ear are more difficult to control and
a long period of protection is necessary.
Insect Insecticidel Amount Days before Notes
S(E=Emulsible) per acre harvest
Budworm, DDT 2E 2-4 qts. High dosages for earworms. Do
Earworm Parathion 4E 1-1 pt. 12 not feed forage or ensilage
SSevin 80W 2 lbs. -- treated with DDT or Toxaphene
Toxaphene 8E l ^-2 pts. to dairy animals or animals
___________ being finished for slaughter
Stinkbug Use lower rates of above insecticides. DDT is not effective. Stinkbugs
Skill the developing kernels by feeding through the husk.
PCOATO INSECTS: Aphids occur during the latter part of the season and will lower
yields if numerous. Do not rely on them to force maturity. Little insect damage
was found at the graders last year. Wireworms have not been a problem for several
years. Tuberworms produced most of the tunneling injury last season. Cutworms can
be expected. Continue spraying up to a week before actual digging. Deeper hilling
will reduce cutworm and tuberworm injury, greening, and insecticide residues. Endrii
has not been withdrawn on potatoes by the FDA but use is risky if tubers are exposed.
INSECTICIDES RECOMMENDED FOR CONTROL OF IRISH POTATO INSECTS IN THE HASTINGS AREA
Insect Insecticidel Amount Days prior Notes
(E=Emulsible) per acre to harvest
Aphids Cygon 2.67E 1-1- pts. 7 Use l1 pts. of Cygon for
Meta-Systox-R2Ei 1 pts. 7 heavy infestations
SyStcx:.2E 1i pts. 21
Thiodan 2E 1 qt. --
Cutworms, Parathion 4E l-1 pt. 5 Use 1 pt. of Parathion for
Plantbugs, Thiodan 2E 1 qt. loopers. Spray up to 1 week of
Tuberworm, Toxaphene 8E 1-2 pts. -- digging for cutworms and tuber-
Worms __ worms.
Wireworm Diazinon AG500 1-2 qts. -- Preplant soil application.
Parathion 4E 2 qts. -- Aldrin is not cleared on
Leafminer May be numerous at harvest but rarely cause damage.
10ther formulations may be used if the amount specified is adjusted
Emulsible insecticides generally give better control and are safer,
and/or less expensive then other formulations.
easier to use,
Growers and suppliers should avoid pesticide contamination of containers and
storage areas for cabbage and potatoes. Insecticides spilled on a truck bed may be
a source of illegal residues. Keep records of pesticide applications for residue
Several new insecticides being tested at the Potato Investigations Laboratory have
produced better cabbage and potato insect control than those now in use. These
materials will be recommended to the growers as soon as they have been cleared by
*Revision of Mimeo Report POL 65-3