Carbohydrate Concentration as a Factor in the Resistance of Squash Varieties to the Pickleworm

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D-glucose concentrations were higher in the fruit of squash varieties which were known to be resistant to the pickleworm, Diaphania nitidalis (Stoll), than in varieties known to be susceptible. Concentrations were higher in the interior of fruits than in the rind, and were higher in fruits 10 days old than in fruits 2 days old. Resistance of fruits in the field appears to increase as D-glucose concentrations increase above 1% and susceptibility increases as concentrations decrease below 1%. Total soluble solids concentrations were highest in young fruits when the content of D-glucose was low. As fruits aged, the amount of D-glucose increased and other soluble solids decreased probably through conversion. Preference tests in the laboratory showed that response of pickleworms to D-glucose could differentiate between concentrations above and below 3%. Their response to squash pulp with 1% galacturonic acid added was decreased. This carbohydrate has been found only in Butternut squash, the most resistant variety tested. Flower nectaries contained 0.5% D-glucose or less with the lower concentrations in susceptible squash varieties. Individual F2 squash plant segregants selected in the field showed that fruits from uninfested plants had a concentration of D-glucose in the fruit rind of nearly twice that in the rind of heavily infested fruits from susceptible F2 selections.

Document Type: Research Article

Publication date: October 1, 1965

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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