Control of the Pear Rust Mite, Epitrimerus pyri

Abstract

The effectiveness of registered and experimental materials was evaluated as to the ability to control the pear rust mite, Epitrimerus pyri (Nalepa). Materials chosen for testing were selected as to prior knowledge of their ability to give control of 1 or more of the “major pests” of pear. Timing of materials for effectiveness was evaluated in applications made at prebloom, early summer, and midsummer timings. The results indicated prebloom application more effective than foliar application. In all applications excellent initial kill of motile stages was obtained with the exception of Guthion,® ( O, O -dimethyl S -(4-oxo-1,2,3-benzotriazin-3 (4 H )-ylmethyl) phosphorodithioate), but residual control was quite variable.