Journal of Economic Entomology (1997) 90, 566-573

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E.H. Beers, A. Andersen and R.D. Brown (1997)
Absorption and translaminar activity of abamectin in apple and pear foliage as determined by spider mite (Acari: Tetranychidae) mortality
Journal of Economic Entomology 90 (2), 566-573
Abstract: Translaminar activity of abamectin was studied during ;1992-1994 on apple, Malus x domestica Borkhauser; and pear, Pyrus communis L. Field-aged residues were bioassayed from the top or bottom leaf surface of apple and pear after atomizer application to the top or bottom surface, or handgun application to both surfaces. Tetranychus urticae Koch was used as the test organism with the exception of 1 experiment, which included, Panonychus ulmi (Koch). Abamectin showed little translaminar activity, on apple regardless of the leaf surface to which it was applied. There was preferential absorption by the bottom leaf surface, which resulted in higher levels of mortality for mites feeding on the bottom surface when this was also the treated surface (bottom/bottom [surface treated/surface assayed]). Mortality caused by other combinations (bottom/top, top/bottom, top/top) was minimal. Mortality from assays conducted on the bottom surface was also higher in the apple/handgun experiments. Translaminar activity was greater on pear, but primarily through the bottom leaf surface. The degree of translaminar movement was sufficient to cause comparable levels of mortality on both the top and bottom surfaces when applied solely to the bottom surface. There was no difference in mortality between the 2 mite species when assayed on the same leaf surface. However, based on control mortality and runoff, the bottom leaf surface of apple and pear is a more favorable habitat for T. urticae than the top surface, whereas the opposite is true for P. ulmi. The implications of mite host preference, feeding behavior, and differential absorption of abamectin are discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Elizabeth H. Beers

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Panonychus ulmi Apple (Malus)
Tetranychus urticae Pear (Pyrus)