AGRICULTURAL RESEARCH CENTER
_- Hastings, Florida
Hastings ARC Research Report PP77-2
L IN THE HASTINGS AREA
.F.A.S. UvBof e Assoc. Entomologist
J.- R. Sahuia, Assoc. Horticulturist
FOLLOW ALL DIRECTIONS FOR USE AND SAFETY ON THE PESTICIDE LABEL AT ALL TIMES.
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.
Meta-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 1/2-1 lb. 14 from insects and greening.
Cutworms, Monitor 4E 1-1 1/2 pts. 14
Tuberworm, Parathion 8E 1/2 pt. 5
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.
Wireworm Diazinon 4E 1-2 qts. None Preplant soil treatment.
Parathion 8E 1 qt. None See "Wireworms" below.
Leafminer May be numerous at harvest, but rarely cause damage.
dosage for other formulations.
APHD-'S: Have not been a problem for several years. Regular pesticide treatment
has not b:en needed as formerly. Inspect plants weekly. Low numbers of aphids
will not injure plants kept in good growing condition (water, fertilizer, etc.).
Minute wasps (light-colored, swollen aphids), lady beetles, and certain flies help
hold in check. 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 treatment?
until aphids decline. Do not use old or untried pesticides or double dosages.
Obtain good coverage. Spreader-stickers will help.
CUTWORMS-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: Those insects are becoming severe pests as effective control is not
available on some crops. Holes in tubers appear as cutworm damage but are larger
and deeper. Feeding occurs on tubers at any soil depth. Control is difficult
because the molecrickets often tunnel deep in the soil.
TUBERWORMS: 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.
WIREWORM: Not a problem for several seasons. Holes in tubers are often called
wireworm injury but may be cutworm, nutgrass, etc. injury.
PICKOUTS: Most tuber injury at graders last season was from enlarged lenticels and
rot caused by poor drainage. Very large tubers are often cut or bruised in
BEET ARMYWORMS: Varies from light green to black. Has lighter stripe on side with
a dark spot above middle pair of legs. Large numbers developed on pigweed and other
weeds last season before moving to potatoes where extensive damage occurred. Only
Lannate or Nudrin will control this worm. The adult is a 5/8 in. grayish moth.
ONION PRODUCTION NOTES
ONIONS: A considerable acreage was commercially grown in S. Florida last year. An
increase has been reported this season. The crop can be grown at Hastings with
harvest in May. Competition is, mainly, from Texas. Yields should be from 200-400
cwt/a when planted about 4 in. apart in double rows. Insect injury has been low in
tests. Blast disease (white spots) has occurred in some plantings. Available
fungicides give excellent control. Fall, winter, and spring weeds are a problem
with the long growing season. Grano 502 has performed best in our tests. Curing
is a problem that is being investigated. The onions can be stored for home use for
several months if rotted bulbs are removed weekly. In tests last season, about 1/2
of the bulbs broke down in about 4 months under shaded and dry storage conditions.
Before producing onions for sale, growers are advised to arrange for sale of the
crop. Items to be investigated are amount, size, quality, condition, packaging,