POTATO INVESTIGATIONS LABORATORY
Mimeo Report 61-2* October 1, 1960
CONTROL OF INSECTS ATTACKING IRISH POTATOES IN THE HASTINGS AREA.
Ralph B. Workman, Assistant Entomologist
FOLIAGE INSECTS: Green peach aphids are the primary foliage insects in the
Hastings area. Large numbers of these aphids develop on the lower leaves of
cabbage before moving to potatoes. Cabbage fields should be well disked
shortly after the last cutting to prevent further migration. Coverage of
insecticide applications must be thorough for the best control. Aphid
infestations begin on the lower leaves. Spreader-stickers are not necessary
on potatoes. Leafminers were spotty last year and may become more of a
problem this season. The controls for aphids are not effective against leaf-
SOIL INSECTS: Numbers of Southern potato wireworms in the soil are expected
to be higher this season than last due to the considerably higher numbers of
adults captured in the Potato Laboratory light trap during the year.
Insecticides for control of wireworms should be applied prior to planting and
thoroughly disked, as soon as possible, into the upper 4-6 inches of soil.
Treat when there is good soil moisture as control measures are less effective
in dry soils due to the downward movement of the wireworms below the treated
Table 1.- Insecticides Recommended for Control of Insects Attacking Irish
Potatoes in the Hastings Area.
Insecticide Amount n. days
Insect (E = Emulsible) per before Notes
acre harvest __
Aphs Endrin 1.6E pt. 3 Parathion is not effective
Aphids Thiodan 2E 1 qt. NT against green peach aphids.
Endrin 1.6E pt. 3 To soil and foliage when
worms Toxaphene E 1-2 pts NTL cutworms appear.
Leaf-footed Endrin 1.6E 1 pt. e
plant bug, Parathion 4E .-1 pt.
Stink bug, Thiodan 2 1 at.
Worms Toxaphene E 1 pt. NTL
Serpentine Parathion 4E -1 pt. i 'i j i; "
leafminer Diazinon 250A 1 pt 1
Parathion 4B 2 \1
Wireworms Parathion2AG -t ing soil treatment.
Diazinon 250AG 2Y-4 gt
1No time limitations.
If other concentrations or formulations of the insecticides above are used,
adjust the amount specified accordingly. Dusts may be substituted for
emulsible compounds at the rate of 20-30 pounds per acre. If control does
not appear satisfactory, wait at least three days and check once more
Observe the safety precautions on the insecticide label at all times.
*Revision of Mimeo Reports 60-4 and 60-6