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University of Flor da University of Florida
CENTRAL FLORIDA RESEARCH AND EDUCATION CENTER
Research Report SAN 86-07 September 1985
EVALUATION OF INSECTICIDAL SEED COATINGS FOR THE CONTROL OF FALL
ARMYWORM ON SWEET CORN AND FIELD CORN SEEDLINGS GROWN IN
SANDY AND ORGANIC SOIL, EXPERIMENT I, 1984
G. L. Leibee
Treated seed for this experiment was provided by Union Carbide.
The treatments consisted of 'Jubilee Fl' sweet corn treated with UC
80502 at 8 and 16 oz of ai/cwt, Orthene 80 seed protectant (the
standard) at 8 oz/cwt, and an untreated check; and 'AD 3995 R23' field
corn seed treated with UC 80502 at 4 and 8 oz of ai/cwt., Orthene 80
seed protectant (the standard) at 8 oz/cwt, and an untreated check.
Eighty 4-inch plastic pots of unsterilized soil were prepared; 40 pots
of Myakka fine sand from the Central Florida Research and Education
Center, and 40 pots of Lauderhill muck from Zellwood, FL. Each of the 8
treatments was planted in 5 pots of each soil type. Five seeds were
planted per pot 3/4-inch deep on July 6, 1984. On July 11, 1984, all
the pots were placed in a field of over mature sweet corn that was
heavily infested with fall armyworm. Eight pots were placed in each of
ten 30 X 20 X 5 inch wooden crates. A crate contained either all 4
sweet corn seed treatments in sand and muck or all 4 field corn seed
treatments in sand and muck. The sweet corn and field corn were not
mixed in the same crate to prevent the fall armyworms from choosing one
kind of corn over the other. The crates were distributed randomly
throughout the corn field. The potted corn plants were returned to the
greenhouse on July 20. The corn was spiking when placed into the field.
When retrieved from the field, the sweet corn was about 7 inches tall
and had 3-4 leaves and the field corn was about 11.5 inches tall and had
3-5 leaves. The plants were rated for damage on July 22 as follows:
0=no damage; 1=slight feeding on oldest leaves; 2=feeding on
intermediate aged leaves; and 3=feeding evident on all leaves.
There were no significant differences in the damage ratings in the
sweet corn and field corn grown in the muck soil. There was a
significant reduction in damage in the sandy soil with the sweet corn
treated with the Orthene standard and UC 80502 at 16 oz (see table).
All the field corn seed treatments grown in the sand showed a reduction
in damage over the untreated check, but the differences were not
significant. No phytotoxicity was observed.
Evaluation of seed coatings for the control of fall armyworm on
sweet corn and field corn seedlings grown in sandy soil.
Treatment- oz. of
Crop ai/cwt of seed Damage rating*
UC 80502, 8 oz.
UC 80502, 16 oz.
UC 80502, 4 oz.
UC 80502, 8 oz.
Means followed by the same letter are not
the 5% level by DMRT.
significantly different at