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Western flower thrips, Frankliniella occidentalis (Pergande), performance on intact chrysanthemums, Dendranthema grandiflora Tzvelev, was compared with that on the sap of squeezed chrysanthemums to examine the importance of plant chemical characteristics. Seventy-six percent of the variation in resistance of intact chrysanthemum cultivars could be explained by the variation in resistance of leaf sap. Thus, the chemical composition of chrysanthemum leaves was a significant factor in resistance to F. occidentalis. Because similarities in resistance were found between Rower sap, leaf sap, and intact, nonflowering chrysanthemums, we suggest there is a chemical resemblance among Rowers and leaves causing thrips resistance in chrysanthemum. Grafts were made between a resistant and susceptible cultivar (cultivars 2 and 15, respectively). A resistance factor was transported from the resistant scion to the susceptible stock, further indicating that chemical compounds play a major role in chrysanthemum resistance to thrips. Relative growth and survival of F. occidentalis larvae was correlated with larval longevity and the resulting feeding damage on intact chrysanthemum cultivars. Thus, growth and survival during the 1st few days can be used as a quick measure of thrips resistance in chrysanthemum.
Document Type: Research Article
Publication date: December 1, 1995
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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.