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 BUDITORM CONTROL ON STREET CORN

 Experiment I Parathion, DDT, Toxaphene, Sevin and Two-Insecticide
 Combinations for Budworm Control. Florigold 107 sweet corn was planted
 on September 10, 1963. Plots were treated equally with a DDT-Toxaphene
 mixture twice weekly from September 13 to September 19 for corn stem
 weevil control. No more insecticide treatments were made before experimental
 applications were begun on October 9. Experimental applications were
 made at 100 gallons per acre on October 9 and 16, and at 150 gallons per
 acre on October 21 and 24. Nearly all of the budworms encountered were
 fall armyworms, Laphygma frugiperda (J. E. Smith). Coth earworms, Heliothis
 zea (Boddie), were infrequent.

 Pints Percent Budworm
 /100 Damaged Plants
 Insecticide Formulation Gals.. Oct. 17 Oct.25

 Parathion 4 lb/gal Flowable 0.5 37 39
 DDT 2 lb/gal EC 4.0 40 50
 Toxaphene 8 lb/gal EC 1.5 45 50
 Sevin 4 Ib/gal Flowable 2.0 45 59
 Parathion-DDT 0.25 2.0 36 36
 Parathion-Toxaphene 0.25 0.75 42 47
 Parathion-Sevin 0.25 1.0 54 55
 DDT-Toxaphene 2.0 0.75 32 31
 DDT-Sevin 2.0 1.0 40 55
 Toxaphene-Sevin 0.75 1.0 41 64
 Untreated-------- 49 68


 Under the conditions of the experiment, none of the treatments were
 satisfactory. After budworms have become established in the whorl, as in
 this experiment, control is more difficult. Also, better control may
 have been obtained had one of the insecticides in each combination been
 used at recommended strength, or if sprays had been applied twice weekly.
 Parathion was the most promising insecticide when used alone. Among
 mixtures, parathion-DDT and DDT-toxaphene showed the greatest promise.


 Experiment II DDT, Sevin, and DDT-Sevin Combinations for Budworm Control.
 Florigold 107 sweet corn was planted on February 7, 1964. All plots were
 treated equally with a DDT-toxaphene mixture twice weekly until February 24.
 Experimental applications were made twice weekly from February 24 to March 9
 and then weekly until April 7. Each spray was applied at 100 gallons per
acre. Only fall armyworms were observed in the whorls. DDT was used as
a 2 pound per gallon emulsifiable concentrate, Sevin as an 80 percent
Sprayable powder.