Hastings ARC Research Re
Hastings ARC Research Rei
AGRICULTURAL RESEARCH CENTER
port PR79-1 1n. A,4,-2 mr 979
TO INSECT CONTROL IN THE HASTINPS AREA 4, 1,-c
R. B. Workman, Assoc. Entomologist
FOLLOW ALL DIRECTIONS FOR USE AND SAFETY ON THE PESTICIDE-LABEft'T-t At-TTIfES..
Potato Insecticide Amount Cutoff Notes
insects (E-Emulsible) per Acre* (days)
Azodrin 5E 13 oz. 7 Aphids on potatoes are resis-
Dimethoate 2.67E 1 1/2 pts. None tant to DDT, Parathion,
Aphids Lannate,Nudrin 90S 1/2-1 lb. 14 Phosdrin, and Thiodan.
Feta-Systox-R 2E 1 1/2 pts. 7
Monitor 4E 1 pt. 14
Pirimor 50W 4-8 oz. None
Systox 2E 1 1/2 pts. 21
Azodrin 5E 13-26 oz. 7 Hilling deeper protects tubers
Armyworms, Lannate,Nudrin 90S 1/1-1 lb. 14 from insects and greening.
Cutworms, rlonitor 4E 1-1 1/2 pts. 14 Only Lannate or Nudrin will
Tuberworm, Parathion 8E 1/2 pt. 5 control beet armyworms.
Other Worms Phosdrin 2E 1 pt. 1
Thiodan 2E 1-2 qts. None
Leaf-footed Guthion 2E 1 qt. 7 Feeding is, generally, on
Plant Bug Parathion 8E 1/2 pt. 5 flower stems. Damage to plant
Green Phosdrin 2E 1 pt. 1 likely very low. Guthion
Stinkbug Thiodan 2E 1-2 qts. None effective on tuberworms.
W-Ir worm Diazinon 4E 1-2 qts. None Preplant soil treatment.
_ Parathion 8E l t. _None See "Hlireworms" below.
.afminer hay be numerous at harvest, but rarely cause damage.
dosage for other formulations.
APHIDS: Have not been a problem for several years. Regular pesticide treatment
has not been needed as formerly and may reduce numbers of parasites and predators.
Inspect plants weekly. Low numbers of aphids will not injure plants kept in good
gr'.'ing condition (water, fertilizer, etc.). Minute wasps (light-colored, swollen
aphids), lady beetles, and certain flies feed on the aphids. Large numbers of
these insects indicate that aphid numbers are declining. If aphid numbers increase
and begin moving to the tops of the plants, control is advised. If control efforts
fail as in 1972, maintain regular treatments until aphids decline. Do not use old
or untried pesticides or double dosages. Obtain good coverage. Spreader-stickers
CUTHORMS-GREENING: Damage occurs later in the season where tubers have been
exposed by soil cracks or washing from rains. Keep tubers covered with soil to
minimize damage. Most cutworm injury is in green tubers which have been exposed
to light. Cutworm control at this time is difficult and of questionable value as
the green tubers will be graded out.
MOLECRICKET: These insects are becoming severe pests as effective controls are not
available. Holes in tubers appear as cutworm damage but are larger and deeper.
Feeding occurs on tubers at any soil depth. Control is difficult because molecric-
kets fly at night and move considerable distances from untreated fields and pastures.
TUBERMORM: A problem only during hot-dry seasons when soils crack open. Potatoes
stored during the summer may have whitish worms or 1/2 in. gray moths in/on them.
Dispose of tubers some time before planting to eliminate a source of infestation.
WIREWJORM: Not a problem for several seasons. Holes in tubers are often called
wireworm injury but may be cutworm, nutgrass, etc. injury.
BEET ARMYWORM: Varies from light green to black. Has lighter stripe on side with
a dark spot above middle pair of legs. Large numbers can develop on pigweed and
other weeds before moving to potatoes where leaves, stems, and exposed tubers are
fed on. Adults are 5/8 in. grayish moths.