3- 
Considerable toxicity of the fungicide zineb to the pickleworm and 
the melonworm was observed in Florida in 1949 by Genung (12) and in 
South Carolina in 1950 by Reid (18). Genung stated in correspondence 
that he obtained similar results in Florida in 1950. 
EARLY EXPERIMENTS 
Nine experiments, consisting of field-plot comparisons of several 
insecticides in the control of the pickleworm and the melonworm on 
summer squash, were conducted by the senior author near Charleston, 
S. C, during the fall-crop seasons of 1930 through 1934. Cucumbers 
and muskmelons were added in 1934, From three to eight, usually four, 
replications of each insecticide were made on plots from 5 to 16 feet in 
width (1, 3, or 4 rows) and from 120 to 262 feet in length. The plant 
varieties used were White Bush, Yellow Crookneck, and Cocozelle 
squash, Early Fortune cucumbers, and Hale's Best muskmelons. The 
insecticides were applied with a bellows-type knapsack duster early in 
the morning in 1930-33 and in the early part of the night in 1934. The 
number of applications ranged from 5 to 12, and the dosage from 12 to 
33 pounds per acre. An exception was a dosage of 54 pounds of a free- 
flowing lead arsenate-sulfur dust in one experiment. Applications usually 
were made every 3 or 4 days during the period of greatest insect abun- 
dance and every 7 to 10 days thereafter. Sometimes they were discon- 
tinued when fruiting began in order to avoid poisonous residues. 
The results of these early experiments were based chiefly on yields 
of sound and wormy (pickleworm-infested) fruits, supplemented by 
pickleworm and melonworm survival counts in 1934. 
The following insecticides were tested: 
Lead arsenate, calcium arsenate, and potassium hexafluo- 
aluminate, undiluted and diluted with 5 parts of sulfur, 
hydrated lime, or a copper-lime fungicide. 
Barium fluosilicate, diluted with 5 parts of hydrated lime in 
one test, and with 1 part of wheat flour and 4 parts of sulfur 
in another. 
Cryolite (natural, containing 89 percent of sodium fluoaluminate), 
diluted with 1 part talc and 3 parts of sulfur. 
Paris green, diluted with 4 l/2 parts each of hydrated lime and 
sulfur. 
Derris powder, diluted with sulfur and either talc or kaolin, 
sulfur composing one-third of the mixture, which contained 
various strengths of rotenone; in one test derris was diluted 
with tobacco dust to contain 1 percent of rotenone. 
Pyrethrum dust, two of unknown pyrethrin content and one 
diluted with tobacco dust to contain 0.1 percent of pyrethrin I. 
