Sub-lethal effects of fenbutatin oxide on prey location by the predatory mite <Emphasis Type="Italic">Iphiseiodes zuluagai</Emphasis> (Acari: Phytoseiidae) |
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Authors: | Adenir V Teodoro Angelo Pallini Claudinei Oliveira |
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Institution: | 1.Animal Biology Department/Entomology,Federal University of Vi?osa,Vi?osa,Brazil;2.Graduate Programme in Agroecology,Maranh?o State University (UEMA),S?o Luís,Brazil |
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Abstract: | We used a Y-tube olfactometer to assess the sub-lethal effects of the acaricide fenbutatin oxide on the olfactory response
of the predatory mite Iphiseiodes zuluagai towards odours from: (1) air or undamaged coffee plants; (2) undamaged or red spider mite Oligonychus ilicis-infested coffee plants; (3) undamaged or false spider mite Brevipalpus phoenicis-infested coffee plants. Predatory mite adult females were exposed to residues of fenbutatin oxide or distilled water on leaf
discs during a period of 72 h prior experiments. When exposed to distilled water (control treatments), predatory mites significantly
preferred undamaged plants over air, O. ilicis-infested plants over undamaged plants, and they did not prefer B. phoenicis-infested plants over undamaged plants. However, predatory mites that had been exposed to residues of fenbutatin oxide were
neither attracted towards undamaged plants nor to O. ilicis-infested plants. Thus, fenbutatin oxide affected negatively the olfactory response of I. zuluagai. We conclude that sub-lethal-effect studies should be considered in pesticide selectivity programs since the ability of predatory
mites to locate their prey may be negatively affected by non-lethal concentrations of pesticides. |
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Keywords: | Olfactometry Phytophagous mite Predatory mite Biological control Sub-lethal effects Pesticide selectivity |
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