Hastings ARC Researc
f',1L ~ i.
R. B. Workman, Assoc. Entomologist
FOLLOW ALL DIRECTIONS FOR USE AND SAFETY ON THE PESTICIDE LABEL AT ALL TIMES.
Cabbage Insecticide Amount/ Cutoff
insects (E-Emulsible) acre* (days)
Dibrom 8E 1 qt. 1 One application of a systemic aphicide
Dimethoate 2.67E 1-1 1/2 pts. 3 applied when the leaves begin to cup
Cabbage Meta-Systox-R 2E 1 1/2 pts. 7 usually gives season long control.
aphid Monitor 4E 1 pt. 35 Good coverage is important. Curled and
Parathion 8E 1/2 pt. 10 yellowed heads cannot be cleaned up.
Phosdrin 2E 1 pt. 1 Aphids are not attracted to headed
Systox 2E 1 1/2 pts. 21 cabbage--sprays are not needed.
Bacillus Cpds: Bactur, Dipel, Thuricide, Etc. Follow label directions.
Cabbage Lannate,Nudrin90S 1/2-1 lb. 1 1/2 lb. effective on a weekly program.
looper Monitor 4E 1 pt. 35 Broccoli-1, days,cauliflower-28 days.
Dibrom 8E 1 qt. 1
Parathion 8E 1/2 pt. 10
Pbosdrin 2E 1 qt. 1
Diazinon 4E 1 pt. 7
Parathion 8E 1/2 pt. 10
* adjust dosage for different formulations
Compounds for loopers will control
most species. Cutworm control is best
applied prior to transplanting.
Drench or spray. Do not increase
dosage. Burning may result.
Apply during late afternoon.
(2E, hE, 8E, WP, Etc.).
Sep.-Nov: 10-12 insect species present--vary with field and year. Mole crickets
are attracted to cabbage seedbeds. They uproot small plants and cut off transplants.
Cutworms, from cover crop, damage transplants. They remain in the soil during the
day, feed at night, cutting plants off near the soil level. Drenches or sprays
will control. Worms from corn and sorghum feed in young plants, bore into heads
where pesticides do not penetrate. Cabbage near corn-sorghum fields is damaged most.
Bacillus compounds do not control. Imported cabbageworms and cabbage loopers feed
on leaves and head.
Dec.-Jan: Cold weather limits insect feeding to warm periods. Insecticide use can
be reduced or eliminated. Inspect fields for insects to see if treatment is
Feb.-Jun: Aphids become numerous early. Diamondback larvae, 1/3 in. long, yellowish
green, feed in buds making many small holes which enlarge as plants mature. Cabbage
webworms feed in buds, webbing leaves together. Plants often fail to make a head.
Imported cabbageworm, velvety-green, was numerous 4 of the last 5 seasons. Cabbage
looper numbers peak in Apr.-May. Regular pesticide applications are needed when
populations begin to increase. Large loopers are very difficult to control.
AGRICULTURAL RESEARCH CENTER
Hastings, Florida JAN 18 1978
h Report PR7T-3 i cA ~v mber 1977
1 .F.A.S. Univ. of IFlonda
CABBAGE INSECT CONTROL IN THE HASTINGS AREA
Biological Control: A minute wasp attacks aphids at Hastings (aphids become
swollen and light colored). It does not give adequate control of cabbage aphids
but is effective on aphids on potatoes. A virus disease (black larvae) destroys
most cabbage loopers in May with low numbers reappearing later.
Insecticides: Most treatments did not give adequate cabbage protection last season
with the high numbers of worms. Few new insecticides are being developed. Costs
are high and registration is very difficult. Many insecticides are being removed
from the market or are under investigation for removal. Effective insect control is
difficult and may become worse. Lack of pesticides must be countered by the best
use of available products and methods.
Insecticide Use: Inspect fields weekly for insects. During periods of high insect
activity, regular insecticide application will be better than waiting until damage
occurs. Worm damage reduces yield, quality, and crop return. If insects or numbers
become large control is difficult, often requiring more pesticide use than if
regular treatments had been made. Use fresh pesticides each season. Opened
insecticides may deteriorate rapidly. Do not use ineffective pesticides, skimp on
dosage, or treat during unfavorable weather. Conduct control tests occasionally on
an area at your farm to see how materials perform under your conditions. Keep
records of materials used, dates, and results.
Insecticide Application: Use proper material and dosage with thorough coverage at
the right time. Doubled dosages will not give increased control and may leave high
residues. Best coverage = best control. Good weed control is necessary for
penetration. Use good agitation. Do not leave spray mixtures overnight in the
tank. Spreader-stickers aid plant penetration and contact of small insects. Too
much will cause insecticide runoff. 50 gals/A with 3 nozzles, 2 on drops, will
give effective control. Use adequate pressure to contact all leaf surfaces. If
you do not get good control, find out why before applying another treatment.
Assessment of Insect Control: Most insecticides remain toxic for several days aftel
application. Control may be by direct contact of the insect, contact by the insect
walking or crawling over the insecticide deposit, or by ingestion of the pesticide
by feeding on the plant. Cold weather may delay control. Wait several days before
checking insect control. Examine the plants to see how many insects remain and what
kind they are. Check plant damage to see if it is new or old. Fresh insect frass
indicates insect presence. Old frass indicates that the insect is dead, pupating,
or has moved to another location. Large, mature insects are most difficult to
control but will usually cease feeding and pupate within a week or so.
Harvest: Fewer wrapper leaves will reduce insecticide residues and insect damage.
Do not treat a field prior to harvest just to clean it up. Inspect first. Treat-
ment may be unnecessary. After final cutting, chop and disc field to reduce
disease and insect buildup and movement to nearby fields.
Pesticide Safety: Follow label precautions. Keep pesticides and containers
locked up when not using or until disposal to prevent accidents or misuse. Do not
breathe pesticide fumes or dusts. Do not get pesticides on clothes or person with-
out immediate removal. Keep records of all pesticide use including kind, amount,
method, date used, etc.