Resistance of Cucurbita to the Pickleworm1


Source: Journal of Economic Entomology, Volume 61, Number 5, October 1968 , pp. 1410-1413(4)

Publisher: Entomological Society of America

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Twenty-seven cultivars and 130 plant introductions of Cucurbita were evaluated in a series of field experiments for resistance to Diaphania nitidalis (Stoll). Distinct differences were detected in degree of pickleworm damage, and cultivars were grouped into 3 general categories resistant, susceptible, and highly susceptible. The cultivars of C. moschata and C. maxima were more resistant to the pickleworm than those of C. pepo.

Pickleworm damage to a resistant cultivar, Butternut, was greater in an isolated planting than in mixed plantings with more susceptible cultivars. However, when isolated plantings of Butternut and susceptible Summer Crookneck were compared, the magnitude of difference in degree of pickleworm damage was consistent with results for mixed plantings.

Based on results obtained with plant-introduction accessions, it appears that Cucurbita introductions of foreign origin may serve as a source of resistant material.

Pickleworm larvae made no significant distinction between a resistant and a susceptible cultivar in preference tests conducted in the laboratory.

Document Type: Research Article

Publication date: October 1, 1968

More about this publication?
  • 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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