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The Effect of Citrus Rust Mite Damage on Citrus Fruit Drop

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Transpiration rates for on-tree citrus fruit were found to be higher for fruit damaged by Phyllocoptruta oleivora (Ashmead) than for undamaged fruit. Pull-testing indicated that bonding force (force necessary to remove fruit from the tree) was negatively correlated with % surface damage by the citrus rust mite (r = −0.287***). Fruit drop rates were increased by citrus rust mite damage in 4 different tests with ‘Valencia’ and ‘Pineapple’ orange and ‘Duncan’ grapefruit. The 3 most important variables in predicting drop were temperature, time, and citrus rust mite damage. The final model for predicting % fruit drop (p) was

p = 0.003911 exp (0.01327D)

where D is % surface damage by rust mite and  is degree-days above 10°C.

Document Type: Research Article

Publication date: October 15, 1978

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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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