Susceptibility of Leafrollers (Lepidoptera: Tortricidae) from Organic and Conventional Orchards to Azinphosmethyl, Spinosad, and Bacillus thuringiensis
| Autor: | D. Thomas Lowery, Michael J. Smirle, Cheryl L. Zurowski |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Tortricidae
Insecticides Pesticide resistance Pandemis limitata Choristoneura rosaceana Bacillus thuringiensis Spinosad Azinphosmethyl Trees Insecticide Resistance Botany medicine Animals Ecology biology General Medicine biology.organism_classification Lepidoptera Drug Combinations Biopesticide Horticulture Insect Science Macrolides medicine.drug |
| Zdroj: | Journal of Economic Entomology. 96:879-884 |
| ISSN: | 1938-291X 0022-0493 |
| DOI: | 10.1093/jee/96.3.879 |
| Popis: | Populations of obliquebanded leafroller, Choristoneura rosaceana Harris, and three-lined leafroller, Pandemis limitata Robinson, were obtained from seven sites in the Okanagan and Similkameen Valleys of British Columbia and assayed for their responses to three insecticides using a leaf disk bioassay. Lethal concentration ratios (LCRs) were calculated for all populations compared with a susceptible laboratory colony of C. rosaceana; significant variation was detected in response to all three insecticides. LCRs were 0.86-15.52 for azinphosmethyl, 0.38-2.37 for spinosad (Success), and 0.58-4.89 for Bacillus thuringiensis (Foray). Correlation analysis indicated no cross-resistance among the three insecticides. Leafroller populations obtained from apple orchards managed with organic production practices were more susceptible to azinphosmethyl than leafrollers obtained from conventionally managed sites. Conversely, the highest levels of tolerance to B. thuringiensis were observed in the populations from organic sites, possibly reflecting usage patterns; B. thuringiensis is one of the few insecticides allowed under organic production guidelines. All populations were highly susceptible to spinosad, which may be a useful tool for resistance management programs if used judiciously. |
| Databáze: | OpenAIRE |
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