-8-


 There is a strong indication that our earworm control measures
should be greatly improved or that we should quit planting sweet corn
to be harvested as late as May. Even daily sprays did not adequately
control earworms.. Gallonages per acre of 25 and 50 were about equally
effective but decidedly superior to 12.5.


Experiment II Parathion, DDT, Toxaphene, Sevin and Two-Insecticide
Combinations for Earworm Control. Experimental applications were made
twice weekly from October 28, 1963, to November 14, and were applied
at 50 gallons per acre. The-Florigold 107 sweet corn was harvested
on November 18 and 19.


Insecticide


Formulation


Pints/
50 gals.
/Acre


Percent Percent Percent
Worm-free Corn Fall
Ears Earworm Armyworm


Parathion
DDT
Toxaphene
Sevin
Parathion-DDT
Parathion-Toxaphene
Parathion-Sevin
DDT-Toxaphene
DDT-Sevin
Toxaphene-Sevin
Untreated


 With the exception
more effective than the
by itself. However, it
of both insecticides in
treatments in which one
are used at the regular


4 lb/gal Flowable
2 lb/gal EC
8 Ib/gal EC
4 lb/gal Flowable


1
8
3
4
0.5 8
0.5 1.5
0.5 2
4.0 -1.5
4.0 -2.0
1.5 -2.0
------me,


.of DDT-Sevin, no insecticide combination was
most effective of the insecticides when applied
was probably a mistake to half the concentration
the combination. Future experiments will contain
or both of the insecticides in a combination
rate.


EES64-19
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