Mimeo Report POL 64-4*
POTATO INVESTIGATIONS LABORATORY
October 1, 1963
POTATO INSECT CONTROL IN THE HASTINGS AREA
R. B. Workman, Assistant Entomologist
APHID: Aphids lower potato yields. Do not rely on them to force maturity.
vine killers or other methods to stop growth before harvest.
WIREWORM: Little wireworm damage to potatoes was found last year. Nearly all
tunnel-type damage was caused by tuberworms.
POTATO TUBERWORM: Tuberworms were present in the field for the second year and
about 2-3p of the potato crop showed damage during harvest. A few fields had as
high as 12-16% damage. Tunnels were short and no live worms were found. It appears
that adverse weather conditions and sprays for aphids eliminated the insect before
severe damage was caused. Chief difference between tuberworm and wireworm injury
is the type of tunnel produced in the potato. Tuberworm tunnels have thickened walls
and can be removed intact from the tuber with a knife. Wireworm tunnels cannot be
removed without breakage.
CUTWORM: Cutworms caused more tuber injury in the area than all other insects in
1963. Spraying should continue during harvest, especially, if digging will take
several weeks. Deeper hilling will reduce cutworm injury, tuberworm injury, green-
ing, and insecticide residues by eliminating exposed tubers.
INSECTICIDES RECOMMENDED FOR CONTROL OF IRISH POTATO INSECTS IN THE HASTINGS AREA
SInsecticidel Amount i Min. days
Insect (E=Emulsible) per before Notes
Dimethoate LE -1l pt. 7 Highest numbers of aphids
Aphid Endrin 1.6E 1 pt. 3 are found on the lower
Thiodan 2E qt. No limit leaves.
Tuberworm Endrin 1.6E 1 pt. 3 Weekly sprays when tubers
Thiodan 2E 1 qt. No limit -are present.
CutwormEnrin 1.6E 1 pt. 3 i Spray soil and foliage
SToxaphene 8E 1-2 pts. No limit through harvest.
Endrin 1.6E 1 pt. 3 !Parathion also gives
Plantbug, Parathion 4E -1 lpt. 5 cutworm control.
tinkbu, iThiodan 2E 1 qt:. No limit
Worms 2 t -i imit
Toxaphene 8E 1-2 pts. :No limit
SDiazinon 250AG i1 pt. 14 lNumerous at harvest.
Leafminer thn 41 pt. 5 Rarely cause damage.
Diazinon 250AG 2-4 qts. !No limit !Preplant soil treatment.
Wireworm i 2 qt No li Do not use A
Parathion 4E 2 qts. No limit !Do not use Aldrin.
amount specified accordingly if other concentrations or formulations
READ AND HEED the safety precautions on the insecticide label at all times. Make
sure that agricultural poisons are not taken for home use.
*Revision of Mimeo Report 63-2