AGRICULTURAL RESEARCH CENTER
!C Research Report PR1981-1 January 1981
POTATO INSECT CONTROL IN THE H TiHfMf W
R. B. Workman, Assoc. E o logfW B :1g9 81
DIRECTIONS FOR USE AND SAFETY ON THE F KIE BEL AT ALL TI S.
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Potato Insecticide Amount Cutoff -
insects (E-Emulsible) per acre* (days)
Azodrin 5E 13 oz. 7 Aphids on potatoes are resistant
Dimethoate 2.67E 1 1/2 pts. None to Parathion, Phosdrin, and
Aphids Lannate,Nudrin 90S 1/2-1 lb. 14 Thiodan. Pirimor has been with-
Meta-Systox-R 2E 1 1/2 pts. 7 drawn from the market due to
Monitor 4E 1 pt. 14 registration problems.
Systox 2E 1 1/2 pts. 21
Azodrin 5E 13-26 oz. 7 Hilling deeper protects tubers
Armyworms, Lannate,Nudrin 90S 1/2-1 lb. 14 from cutworms and greening. Only
Cutworms, Monitor 4E 1-1 1/2 pts. 14 Lannate or Nudrin will control
Tuberworm, Parathion 8E 1/2 pt. 5 beet armyworm (black dot over 2nd
Other Phosdrin 2E 1 at. 1 pair of legs). Monitor controls
Cater- Pydrin 2.4E** 2.7 oz. 7 Colorado potato beetle.
pillars Thiodan 2E 1-2 qts. None
Leaf-footed Guthion 2E 1 qt. 7 Feeding is, generally, on flower
SPlant Bug Parathion 8E 1/2 pt. 5 stems. Damage to plant is likely
Green Phosdrin 2E 1 pt. 1 very low. Guthion is effective
Stinkbug Thiodan 2E 1-2 qts. None on tuberworms.
Wireworm Diazinon 4E 1-2 qts. None Preplant soil treatment. Not a
Parathion 8E 1 qt. None problem for several years.
Leafminer May be numerous at harvest, but rarely cause damage.
Adjust dosage for other formulations (2E, 4E, 8E, WP, etc.)."
** Pydrin was recently registered on potatoes for potato aphid (Florida has, mainly,
green peach aphids), potato tuberworm, tarnished plant bug, and Colorado potato
beetle. It is a highly effective synthetic pyrethroid similar to Ambush and
Pounce. Control of insects occurring in cool-moist soils or dense leaf cover may
be erratic as it appears that exposure of poisoned insects to sunlight, dry soils,
and predators adds to the effectiveness of the material.
Aphids: Have not been a recent problem. Regular pesticide treatment is not needed
as formerly and may reduce numbers of parasites and predators. Low numbers of aphids
will not injure plants kept in good growing condition. Tiny 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 spray weekly until numbers decline. Use
good coverage. Spreader-stickers will help. If controls fail, doubled rates or
nonrecommended pesticides will not help. The infestation will decline in time.
Cutworms mole crickets: Cutworm damage usually occurs on greened tubers. Mole-
cricket damage is becoming common. It appears as tunnels which penetrate deeper into
the tubers and occurs at all soil depths. Control is not promising.
Beet armyworm: Feeds on potato leaves and exposed tubers. Numbers build up first on
pigweeds about fields. Color varies from light green to black.
n^/ Hastings AR