PEREIRA, R. L.; http://lattes.cnpq.br/2222840855995021; PEREIRA, Rute Lemos.
Resumo:
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.