Efeito do ciantraniliprole na sobrevivência e capacidade de voo da abelha africanizada.

Abstract

The bees are insects responsible for the pollination and maintenance of hundreds of plant species used in human food, having a representative impact on income generation and socioeconomic development. The effects of bee intoxication by pesticides can cause several losses, such as honey contamination, behavioral changes, gene mutation and death. Therefore, this study aimed to evaluate the toxicity of the insecticide Cyantraniliprole on the survival and flight ability of adult workers of the Africanized honey bee A. mellifera, in its commercial doses recommended and used throughout Brazil. The work was carried out in the Entomology Laboratory of CCTA/UFCG, Pombal Campus/PB, being evaluated the toxicity levels through bioassays, corresponding to two forms of exposure: direct spraying on the bees and contaminated diet. To assess toxicity, five commercial doses of the insecticide Cyantraniliprole (0.015; 0.02; 0.04; 0.05; 0.1 g i.a. L -1) were tested and compared with the absolute witness (distilled water), and positive witness (Thiamenoxam), with each experimental unit consisting of 10 adult bees. For the mode of exposure ingestion of contaminated diet, there was no significant difference between the doses of the insecticide tested, which showed mortality between 6.0% and 15.4%, statistically differing from the positive control (thiamethoxam), which caused the death of 99 % of bees. Via direct spraying, the insecticide Cyantraniliprole, regardless of the dose used, was little harmful to bees, causing mortality between 9.1% and 41.6% in the 24 hours of observation, with a dose of 0.015 g i. The. L-1 which caused the lowest mortality. Regarding flight capacity, regardless of the mode of exposure, it was observed that bees exposed to Cyantraniliprole were able to reach all levels of flight height, as well as those exposed to absolute control. However, it is noteworthy that for the three highest doses evaluated and in the direct spray exposure mode, many bees remained at the base of the flight tower, with emphasis on those exposed to the highest dose, which showed mobility deficit. The insecticide evaluated was considered of low risk, but negatively affected the flight capacity of the honey bee A. mellifera at a dose of 0.1 g i. a.L-1 via direct spraying.