POTATO INVESTIGATIONS LABORATORY
Mimeo Report 60-4* September 25, 1959
CONTROL OF INSECTS ATTACKING IRISH POTATOES IN THE HASTINGS AREA.
Ralph B. Workman
Regular spray applications should begin when the first aphids or other foliage
feeders appear. These materials may be combined in the same spray solution with
the fungicides used to control late blight.
Apply the insecticide to the soil prior to planting and disk in immediately.
Thorough mixing of the insecticide into the upper four to six inches of soil is
very important. Lowering of the nozzles and using a pressure of 100-150 psi will
reduce the amount of spray drift. As parathion appears to be effective for only
about three to five weeks, treat when there is good soil moisture. In very dry
soils wireworms tend to move downwards below the treated zone.
The Southern potato wireworm, common to the Hastings area, takes about two
weeks or longer to be killed by parathion. The wireworms may be capable of move-
ment, but if they are unable to walk in the normal fashion and appear stretched out
with the head upwards, they may be considered as dead.
In field tests at the Potato Investigations Laboratory during 1958-59,
parathion, Diazinon, and Thimet gave excellent control of the Southern potato wire-
worm at one and two pounds actual per acre. Recommendations of Diazinon and Thimet
for wireworm control will not be made until approved by the Food and Drug
Read and observe the safety precautions printed on the insecticide label.
Table 1.- Insecticides Recommended for Control of Insects Attacking Irish Potatoes
in the Hastings Area.
Insecticide Amount in Min. days Notes
Insect E=Emulsible 100 gals. before
per Acre harvest
Endrin 1.6E 1 pint 3
Aphids Parathion .E -1 pint 5
Thiodan 2E 1 quart NTL1
Endrin 1.6E 1 pint 3
Cutworms Toxaphene 8E 1-2 pints NTLi
Leaf-footed Endrin 1.6E 1 pint 3
plant bugs, Parathion 4E 1 pint 5
Stink bugs, Thiodan 2E 1 quart NTL1
Worms Toxaphene 6E 1 pint NTL1
Serpentine Parathion 4E |-1 pint 5
leaf miners Diazinon 2E 1 pint 14 Use if parathion fails.
Wireworms Parathion 4E 2 quarts NTL- Preplanting soil treatment.
1No time limitations.
If other concentrations of the insecticides above are used, adjust the amount
Dusts may be substituted for emulsible compounds. Use at the rate of 20-30
pounds per acre.
*Revision of Mimeo Report 59-3