Sub-lethal effects of fenbutatin oxide on prey location by the predatory mite Iphiseiodes zuluagai (Acari: Phytoseiidae).
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.
Teodoro
Adenir V
AV
Animal Biology Department/Entomology, Federal University of Viçosa, Viçosa, MG, 36571-000, Brazil. ad.teodoro@yahoo.com
Pallini
Angelo
A
Oliveira
Claudinei
C
D000818:Animals; D040503:Coffea; D005260:Female; D008925:Mites / Q000187:drug effects* / Q000502:physiology; D009812:Odorants; D009947:Organotin Compounds / Q000494:pharmacology*; D010575:Pesticides / Q000494:pharmacology*; D011235:Predatory Behavior / Q000187:drug effects; D012903:Smell / Q000187:drug effects*; D040102:Tetranychidae
D009947:Organotin Compounds; D010575:Pesticides; C022071:vendex