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Effects of diflubenzuron and penfluron on workers of Apis cerana indica F and Apis mellifera L

1995; Springer Science+Business Media; Volume: 26; Issue: 1 Linguagem: Inglês

10.1051/apido

1297-9678

P. R. Gupta, Rajeshwar Singh Chandel,

Plant and animal studies

— Newly emerged adult workers of Apis mellifera and A cerana indica tolerated a topically applied dose of 100 μg diflubenzuron (DF) and penfluron (PF) in acetone but the treated bees weighed less than control bees at 2 and 6 d of age.Oral administration of 100 μg DF (as Dimilin 25% wettable powder) in 10 μl sugar syrup proved fatal to A c indica.After 6 d of feeding 50 μg DF, hypopharyngeal gland development, measured as size of acini, was significantly suppressed in both bee species.The suppressed gland development in the treated group could be a consequence of poor gain in weight.Fora- gers of both bee species readily accepted DF-contaminated sugar syrup and, with increasing doses, there was decrease in time required to consume the contaminated sugar syrup in a dose-dependent manner.The treated bees weighed significantly less than the control bees.Thus, at higher doses chi- tin synthesis inhibitors may also prove harmful to adult bees.Apis mellifera / Apis cerana indica / toxicity / insecticide / diflubenzuron / penfluron