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Leaf disks from field grown strawberry cultivars 'Dixieland,' 'Surecrop,' and 'Citation' and clones of Ky 22-61-9 and Ky 17-61-15 were utilized in laboratory studies to observe the influence of season on the acceptability of foliage to Tetranychus urticae Koch. Preference and non preference responses were measured by number of female mites active and trapped in a sticky barrier ringing the leaf disk. Fecundity also was measured to observe possible manifestation of antibiosis. Foliage was generally attractive to the mites in spring and early summer but not during July and August. Foliage was again attractive to the mites in September but reverted to a relatively unattractive condition in October and Novemher. Cultivars Dixieland, Surecrop, and Citation were significantly preferred over Kentucky clones 22-61-9 and 17-61-15. The basis for resistance of these selections to mites a pparently precluded antibiosis as a factor. A lack of tolerance was apparent in Citation; this cultivar appeared to be suffering from a deficiency of water when injured by mites. Generally, resistance was manifested as a hehavioral response of the mites to some component of the leaf disk that either attracted or repelled them; the \'ariablcs were strawberry selection and seasonal influcnce on the plant.
Document Type: Research Article
Publication date: August 1, 1971
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.