POTATO INVESTIGATIONS LABORATORY
" Mimeo i-port POL 70-2
CABBAGE AND POTATO INSECT CONTROL IN THE HASTINGS AREA
R. B. Workman, Assoc. Prof. (Assoc. Ent.)
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
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Insect Insecticide Amount Minimum days Notes
(E-Emulsible) per acre Tbefore harvests
Dibrom 8E 1 qt. 1 JFast, short activity.
Cabbage Cygon 2.67E llpt. 3 Fast, long activity. Systemic.
aphid Parathion 4E l pt. 10 iFair control only.
Phosdrin 2E i lpt. 1 IFast, short activity.
SSystox 2E 14 pts. 21 Fast, long activity. Systemic.
SMeta-Systox-R 2E l- pts. 24 ;Fast, long activity. Systemic.
Bacillus thur. E ;2-3 qts. NTL !Good control.
Cabbage Bacillus thur. WPI 3-4 lbs. NTL !Good control.
looper, DDT 2E plus i2 qts. + Do not apply !Fewer wrapper leaves will give
Worms, Toxaphene 8E 1 qt. after heading ;lower residues. Good control.
Cutworms Dibrom 8E 1 qt. 1 Fair control.
Lannate 90S lb. 7 Good control.
Parathion 4E 1 pt. 10 Fair con rol.
SParathion 4E + 1l pt. + .4 Fewer wrapper leaves will
SToxaphene 8E 1! qt. give lower residues. Fair.
Phosdrin 2E 1 qt. 1 'Fair control.
(seed bed) Baits
Materials listed as giving fair
Materials listed as giving fair
or drench. Treat area
seed bed for best con-
Do not increase dosage.
Results are often erratic.
control may give poor control of
high populations of loopers. Timing and complete coverage are very important under
these circumstances. Teckly 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. Sp'r.al] attention is needed
at these times. Missing 1 or 2 treatments or using ine'f,:c ;.jve treatments may
result in a loss of control. Loopers over 3/4 inch long .re nearly impossible to
control. Parathion plus Bacillus thur. has looked good in tests. Trials should
be 1 pt. of Parathion plus 1 qt. or 2 lbs. of Bacillus with cutoff 10 days before
CABBAGE APHID: Systemic insecticides used at cupping or a little
give season-long control. The systemic effect is largely lost on
Other insecticides listed must be used regularly to prevent aphid
"Aphid heads" are most difficult to clean up.
later will often
INSECTICIDE TESTS: Best control of loopers on cabbage at the Potato Investigations
Lab in 1969 were, in order: Monitor, Thuricide, Azodrin, and Fundal. Commercial
control was given by DuPont 1642, Velsicol 506, and Lannate. Best control of
cabbage aphids was given by Phosdrin, Azodrin, and Monitor.
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INSECTICIDES RECOMMENDED FOR CONTROL OF IRISH POTATO INSECTS
Insect i Insecticide Amount Days prior Notes
(E-Emulsible) per acre to harvest
Aphids Cygon 2.67E i1 pts, NTL Thiodan control failing.
Meta-SystoX-R 2E 1- pts. 7
SSystox 2E 1; pts. 21
Armyworms, Parathion 4E 1 pt. 5 Spray up to 1 week of digging
Cutworms, Phosdrin 2E i1-2 pts. 1 for cutworms and tuberworms.
Tuberworm, Thiodan 2E 1-2 qts. NTL
Other Worms Toxaphene 8E 1-2 pts. NTL
Leaf-Footed Guthion 2E '1 qt. '7 Guthion reported good on
Plant Bug, Parathion 4E pt. 5 tuberworm.
Green Phosdrin 2E il pt. 1
Stinkbug Thiodan 2E 1-2 qts. NTL
Wireworm Diazinon AG500 i1-2 qts. NTL Preplant soil treatment. Wire-
SParathion 4E '2 qts. NTL worm damage minor last 5 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.
NEMATODE TREATMENT: Fumigant-type nematocides appeared to increase yields in a
number of potato fields last season. Growers suspecting low yields due to nematodes
should treat a portion of problem areas leaving a part untreated so that compar-
isons can be made. Yield and/or quality increases must be sufficient to cover cost
of treatment to be profitable.
PESTICIDE LAWS: Restrictions against pesticides, pesticide use, and pesticide
applicators are increasing. Such increases are expected to continue. Pesticide
poisonings and contamination of other persons or property accelerates demands for
restrictions. Growers and pesticide applicators must see that pesticides are used
properly and do not drift to adjacent fields, homes, persons, or animals in the
area. Pesticides must not be applied or discarded where they can reach streams,
ponds, or lakes. Keep pesticides and containers from public access, preferably
under lock and key. Methods for the proper use and disposal of pesticides and
containers are listed on the product label.
INSECTICIDE TESTS: Best control of aphids on potatoes at the Potato Investigations
Lab in 1969 were, in order: Monitor at 3 dosages, Azodrin, Thompson Hayward 427-1,
POL 70-2 Page 2