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Flowering, Fruit Set, and Yield Response of 'Bartlett' Pear to Leaf-Scorch Damage by Twospotted Spider Mite (Acari: Tetranychidae).

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The effect of leaf scorch and defoliation caused by twos potted spider mite, Tetranychus urticae Koch, was investigated on flower production, fruit set, fruit yield, and mean fruit weight of 'Bartlett' pear. The level of leaf scorch and defoliation was estimated in autumn, and the number of flowers per flower cluster, fruit set, and fruit yield were determined in the following season. The number of flowers per flower cluster was significantly reduced (P < 0.05) by leaf scorch and defoliation in the previous summer, but the response was only slight with flower clusters having approximately five flowers per flower cluster. Fruit set per flower cluster, gross fruit yield, and the yield of fruit suitable for canning were Significantly reduced (P < 0.01) by leaf scorch and defoliation in the previous year. On trees with 80% leaf scorch and defoliation in the previous summer, gross yield and the yield of fruit suitable for canning were reduced to approximately a third of the level determined for trees that experienced no leaf scorch and defoliation in the previous year. Mean fruit weight increased only marginally as fruit density per square meter of planted area decreased, indicating that leaf-scorch damage from twos potted mite may affect fruit growth of 'Bartlett' pear in the following year. Fruit set was not responsive to leaf-scorch damage in the second and third years after leaf damage had occurred. The effect of these results on a damage threshold is discussed.

Document Type: Research Article

Publication date: April 1, 1993

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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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