Abstract
Sixteen varieties of squash were tested for resistance to pickleworm, Diaphania nitidalis (Stoll). differences were very distinct between the more resistant and the more susceptible varieties. The more resistant varieties were Butternut 23, Summer Crookneek, Early Prolific Straight neck, and Early Yellow Summer Crookneek. The more susceptible varieties were Cozini, Black Zucchini, Caserta, Zucchini, Short Cocozelle, and Benning Green Tint Scallop. Tests with insecticides showed that better control could be obtained on resistant than on susceptible varieties. The peel and interior fruit portions of seven varieties were analyzed for amino acids and carbohydrate materials. There was no clear evidence of correlation between chemical composition and resistance. Galacturonic acid occurred only in the most resistant variety, Butternut 23, suggesting that further study should he made regarding the influence of this compound.
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