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1 December 2015 Resistance Management for San Jose Scale (Hemiptera: Diaspididae)
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The San Jose scale Diaspidiotus perniciosus Comstock is one of the most important pests of deciduous fruit trees. The major cause of recent outbreaks in apple orchards is thought to be the development of insecticide resistance, specifically organophosphates. The first report was given in North America, and now, in Chile. In the present study, San Jose scale populations collected from two central regions of Chile were checked for their susceptibility to different mode of action insecticides in order to establish alternatives to manage this pest. No evidence of cross resistance between organophosphates insecticides and acetamiprid, buprofezin, pyriproxyfen, spirotetramat, sulfoxaflor, or thiacloprid was found. Baselines of LC50–LC95 for different life stages of San Jose scale are given, as reference to future studies of resistance monitoring. The systemic activity of acetamiprid, spirotetramat, and thiacloprid was higher than the contact residue effect of these compounds. For sulfoxaflor, both values were similar. Program treatments including one or more of these compounds are compared in efficacy and impact on resistance ratio values. In order to preserve new insecticides as an important tool to control San Jose scale, resistance management programs should be implemented, considering insecticide mode of action classes alternated or mixed.

© The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America.All rights reserved. For Permissions, please email:
K. Buzzetti, R. A. Chorbadjian, and R. Nauen "Resistance Management for San Jose Scale (Hemiptera: Diaspididae)," Journal of Economic Entomology 108(6), 2743-2752, (1 December 2015).
Received: 7 April 2015; Accepted: 17 July 2015; Published: 1 December 2015

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