AGRICULTURAL RESEARCH CENTER
< HASTINGS, FLORIDA
Hastings ARC Research Report PR-1975-8 October 1975
CORN AND SORGHUM INSECT CONTROL IN THE HASTINGS AREA
R. B. Workman, Assoc. Entomologist
FOLLOW USE AND SAFETY DIRECTIONS ON THE PESTICIDE LABEL AT ALL TIMES.
Insect Insecticide Amount/ Notes
Armyworm, Parathion 8E+ 1/4 pt. + Apply to run into bud whorls.
Corn Toxaphene 8E 1 1/2 pts. Spreaders help. Small larvae
earworm Parathion 6-3E 1/2 pt. are easiest to kill. Plant early
Sevin 80W 1 1/4-2 1/2 lbs. for fewer insects.
Lesser corn- Dansanit 15G 6.7 lbs. Apply in 12-in. band in front
stalk borer Furadan 10G 10 lbs. of press wheel at planting. No
effective control after plants
Armyworm, Parathion 8E 1/2 pt.
Corn Parathion 8E+ 1/4 pt. +
earworm, Toxaphene 8E 1 1/2 pts.
Sorghum 5oxaphene 8E 1 qt.
Webworm Sevin 80W 1 1/4-2 1/2 lbs.
Sorghum Diazinon hE 1/2 pt. Apply when 90 he eads
Midge Ethion hE 1/2-1 pt. have emer the ot and
Parathion 8E 1/4 pt. before o Repeat 'n 3-5
Sevin 80W 2 1/2 lbs. days fa s are still tive.
Restrictions and Limitations
Diazinon-7 days for sorghum grain. No time limit T r sorgin forage.
Ethion-30 days of harvest or feeding forage. No more ehan 3ame s per se n/
Parathion 8E-12 days of harvest or forage cutting for corn al sorghum.0 "
Parathion 6-3E-12 days of harvest or forage for corn. ,Not labeled ta' ghum.
Sevin-NTL for corn. 21 days for sorghum grain. NTL for sorghum for ~og"
Toxaphene-Do not feed corn forage to dairy animals or anfial, ihg'finished for
slaughter. Sorghum-28 days of harvest. Do not apply more gnoce after heads
start to form. Do not graze dairy animals brtagimals being'Pflnished for slaughter.
on treated fields. Do not ensile treated forage.
SORGHUM MIDGE:Adult midges are orange flies about 1/12 in. long. Unless numerous,
they are difficult to detect. They fly about the newly emerged heads to lay eggs.
Depending on variety, the spikelets are receptive to egglaying up to 10 days follow-
ing head emergence. The larval maggots feed on the developing seeds causing blight-
ed heads. Two sprays, 3-5 days apart as above, will give protection.
LESSER CORNSTALK BORER: Green worms about 5/8 in. long with brown stripes and head
bore in the base of the plant, often, killing it. Dirt-covered silk tunnels are
constructed near the plant in the soil. Crops including sorghum, grasses, and cow-
peas on the sandier soils are damaged most.
STINKBUGS: Species of stinkbugs often cause damage to corn kernels by sucking
juices out through the husk. Damaged kernels are shriveled and black or missing
at harvest. Sorghum heads sustain damage also. Sprays for other insects will
PLANT EARLY: Early plantings often escape the heavy insect damage common later in
S the season.
10-1-75 300 copies