AGRICULTURAL RESEARCH CENTER------
....... stings, Florida
Hastings ieesearh Report PR-1973-4
POTATO INSECT CONTROL IN THE HASTINGS AREA
R. B. Worliman, Assoc. Entomologist
FOLLOW ALL DIRECTIONS FORi )S-, SAFETY ON
THE PESTICIDE LABEL~ATT .A TIMES.
Aphids on potatoes are resistant
to DDT, Parathion, Phosdrin, anc
Spray up to 1 week of digging
for cutworms and tuberworms.
Hilling deeper protects tubers
Thiodan 2E 1-2 qts. None
Leaf-Footed Guthion 2E 1 at. 7 Guthion effective on tuberworms.
Plant Bug, Parathion 8E 4 pt. 5
Green Phosdrin 2E 1 pt. 1
Stinkbug Thiodan 2E 1-2 qts. None
Wireworm Diazinon 4E 1-2 qts. None Preplant soil treatment. See
Parathion 8E 1 qt. None "Hireworms" below.
Leafminer May be numerous at harvest but rarely cause damage.
* Adjust dosage for other formulations.
APHIDS: Aphid populations begin on the underside of the lower leaves,
usually, next to the soil surface. Use drop nozzles to get best coverage of
these leaves. Spray pressure of 200-300 psi will turn the leaves for complete
coverage. Some insecticides give only aphid control while others are also effec-
tive on worms and stinkbugs. Many aphids on potatoes come from cabbage. Disc
cabbage fields shortly after the last harvest to eliminate this source of aphids.
WIREWORMS: Wireworm damage is expected to be very low this season as it has
been for several years. Soil fumigation kills some wireworms, but those near the
soil surface usually escape.
TUBERWORMS: Tuberworms are still susceptible to most of the insecticides
used for worms and stinkbugs. Most damage occurs during dry seasons due to soil
cracking around the tubers. This allows egg laying on the exposed tubers. Regular
treatment during tuber formation will give good control. Tuberworm tunnels
usually have a "corky" lining.
STINKBUGS: Plant bugs are sometimes a minor problem on potatoes. Feeding is
usually confined to the upper stems and, most often, those with flowers. One
treatment will usually give control. Plant damage is probably very low.
CUTWORMS: Cutworms must be controlled by regular treatments before they get
to the tubers. Most damage is found on exposed tubers--those discolored or greene(
by sunlight. Deeper hilling and covering, if possible, after heavy rains will re-
duce most of the damage. Cutworm injury is worse near trees or weedy areas where
the adult moths hid- ri-ring the day. The moths fly and lay eggs mostly at night.
f f-[ .... "..,..