Vol. 71 No: 6

Title:
The Relationship between Early-Season Leaf Feeding by Apple Rust Mite, Aculus Schlechtendali (Nal.), and Fruit Set and Photosynthesis of Apple

Authors:
M.A. EASTERBROOK and J.W. PALMER

pp: 939-944

Abstract:
Comparisons were made of numbers of fruit set on individual blossom clusters or whole trees of apple cvs Bramley's Seedling and Cox's Orange Pippin infested with large numbers of apple rust mite, Aculus schlechtendali, and on those infested with small numbers of mites following the use of a pre-blossom acaricide or glue barrier. There was no clear evidence that mite feeding on the leaves of the blossom clusters reduced the initial fruit set, even when numbers of rust mites reached several hundred per primary spur leaf. Photosynthetic rate was not reduced on primary spur leaves over a range of 3–160 rust mites per leaf in May.

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