Studies in the Resistance of Tomatoes to Mites1

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Abstract:

Selected plant introduction lines of tomato species were Screened for resistance to the twospotted spider mite Tetranychus urticae Koch, by mite-injury ratings and by counting mites and eggs found on disks 12.5-mm diam cut from randomly selected leaves of greenhouse-grown plants.

Highly resistant PI 251303 and moderately resistant 'Floralou' were tested further by confining 10 teneral fe- males in areas 12.5-mm diam circled with Tanglefoot® and by counting progeny after 24, 48, and 72 hr. The effect of leaf surface and leaf age was tested.

After 72 hr Floralou had fewer mites dead or entrapped in Tanglefoot on both leaf surfaces than did PI 251303, indicating more resistance and nonpreference in the latter line. In both lines, the lower leaf surface appeared to have a more detrimental effect on mite survival. Differences in leaf age were not apparent in Flo- ralou, but in PI 251303, fewer mites survived on the upper new leaves than on the upper old leaves. Data indicate that the nature of resistance PI 251303 is more complex than mere non preference.

Document Type: Research Article

Publication date: February 1, 1972

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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