meo Repor t POL -
Mimeo Report POL 69-2
POTATO INVESTIGATIONS LABORATORY
CABBAGE, POTATO, AND CORN INSECT CONTROL IN THE HASTINGS AREA
R. B. Workman, Assoc. Entomologist
Follow the safety precautions on the insecticide label at all times. Make sure
correct dosages are used. Insecticides and fungicides may be applied together.
Mixing of herbicides and fertilizers with insecticides may cause chemical break-
down and is not recommended. NTL: No time limit when used as recommended.
INSECTICIDES RECOMMENDED FOR CONTROL OF CABBAGE INSECTS
Insect Insecticide Amount Minimum days Notes
(E-Emulsible) per acre before harvest,
Dibrom 8E i1 pt. 1 jFast, short activity.
Cabbage Cygon 2.67E 1- pts. 3 Fast, long activity. Systemic.
aphid Parathion 4E 1-l pt. 7-T, 10-1 pt.iFair control only.
Phosdrin 2E l pt. 1 iFast, short activity.
Systox 2E E pts. 21 Fast, long activity. Systemic.
D Meta-Systox-R 2E i 1 pts. 24 IFast, long activity. Systemic.
SDDT 2E plus 2 qts. + 21 Fewer wrapper leaves will give
Cabbage Toxaphene 8E 1 qt. flower residues. Good control.
looper, Dibrom 8E 1 qt. 1 Control fair.
Worms, Parathion 4E l pt. 10 Control fair.
Cutworms Parathion 4E + fl pt. + 14 Fewer wrapper leaves will
Toxaphene 8E 1 t. give lower residues. Fair.
Phosdrin 2E i l-2 pts. 1 .High dosage for loopers, Fair.
iBacillus thur. '2 qts. NTL Looks promising. Good.
Mole Diazinon AG500 1 pt. NTL Spray or drench. Treat area
cricket Parathion 4E 1 pt. NTL around seed bed for best con-
Cutworms trol. Do not increase dosage.
(seed bed) Baits I Results are often erratic.
LOOPERS: DDT + Toxaphene and Bacillus gave the best control in statewide tests
last season. Control by the other materials listed gave fair control. None of
the compounds will give excellent control. Timing and complete coverage are most
important under these circumstances. Weekly applications and insecticide deposit
on all sides of the leaves are necessary for best control. Five to six nozzles
per row, applying 100 gallons per acre at 200-300 psi, are recommended for sprayers.
Looper damage at Hastings is highest during Nov.-Dec. and Apr.-May. Special
attention is needed at these times. Missing 1 or 2 treatments or using ineffective
treatments may result in a loss of control. Loopers over 3/4 inch long are
nearly impossible to control.
CABBAGE APHID: Systemic insecticides used at cupping or a little later will
often give season-long control. The systemic effect is largely lost on headed
cabbage. Other insecticides listed must be used regularly to prevent aphid
build up. "Aphid heads" are most difficult to clean up.
DDT: The use of DDT on crops will probably be discontinued at the end of 1968 by
INSECTICIDES RECOMMENDED FOR CONTROL OF IRISH POTATO INSECTS
Insect Insecticide Amount Days prior Notes
i(E=Emulsible) per acre to harvest
Aphids Cygon 2.67E 1-1 pts. 7 Use i1 pts. of Cygon for
SMeta-Systox-R 2E 1 pts. 7 heavy infestations.
Systox 2E lI pts. 21 Thiodan control appears to be
Thiodan 2E 11 qt. NTL slipping.
Cutworms, Parathion 4E -1 pt. 5 Use 1 pt. of Parathion for
Plantbugs, Thiodan 2E 1 qt. NTL loopers. Spray up to 1 week of
Tuberworm, Toxaphene 8E 1-2 pts. NTL digging for cutworms and tuber-
Worms i worms.
Wireworm i Diazinon AG500 1-2 qts. NTL jPreplant soil treatment. Wire-
Parathion 4E 2 qts. NTL !worm damage minor last 4 years.
Leafminer May be numerous at harvest but rarely cause damage.
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 to harvest.
NEMATICIDES: Nonfumigant treatments giving promise in the control of insects
and nematodes are Dasanit, Furadan, Lannate, Mocap, Temik, Thimet, Zinophos, and
some numbered compounds. These materials may be recommended on potatoes and
cabbage in the future. Nematodes appear to be a growing problem in the Hastings
INSECTICIDES RECOMMENDED FOR CONTROL OF FIELD CORN INSECTS
Insect Insecticide i Amount Days before Notes
(E=Emulsible) per acre harvest
Budworm, DDT 2E 2-4 qts. NTL High dosages for earworms. Do
Earworm f Parathion 4E -1 pt. 12 not feed forage or ensilage
Sevin 80W 2 lbs. NTL treated with DDT or Toxaphene
Toxaphene 8E 1 -2 pts. NTL to dairy animals or animals
| being finished for slaughter
Stinkbug Use lower rates of above insecticides. DDT is not effective. Stinkbugs
kill the developing kernels by feeding through the husk.
The earlier corn can be grown, the less subject it is to insect damage.
Cabbage following corn cover crops should be inspected for corn earworms. These
worms are usually light-colored with light and dark stripes running lengthwise of
the body. The insects tunnel into the heads where they are very difficult to
control. Regular "preventative" treatments are necessary.
POL 69-2 Page 2