AUGUSTO, L. P.; http://lattes.cnpq.br/9222718556653238; AUGUSTO, Letícia Pinheiro.
Resumo:
The melon (Cucumis melo L.) is one of the main cucurbits cultivated in
Brazil, especially in the Brazilian Northeast. Among the management strategies used
during melon cultivation are chemical pest control and the addition of the honey bee
Apis mellifera hives around the production areas. Thus, the challenge of carrying out
chemical control of pests and preserving bees in the field arises, being essential
studies related to the toxicity of insecticides on the pollinators of the crop. Therefore,
the objective was to evaluate the survival and flight capacity of the honey bee A.
mellifera after exposure to residues of the insecticide Sulfoxaflor on melon leaves. The
work was carried out at the Entomology Laboratory belonging to the CCTA/UFCG,
Campus Pombal/PB, in a completely randomized design, in a 3 X 6 factorial scheme,
with two doses of the insecticide Sulfoxaflor, 0.048 g i.a./L and 0.192 g i.a./L, a control
(distilled water) and six exposure times (Immediately after spraying, 1h, 2h, 3h, 24h
and 48h after spraying), with 10 repetitions. After exposure to residues on leaves,
mortality and behavior bee were evaluated at 1h, 2h, 3h, 4h, 5h, 6h, 12h and 24h.
100% mortality was observed in bees exposed to a dose of 0.048 g i.a./L after contact
with freshly sprayed leaves and at 1h, 2h and 3h after spraying. The mortality of bees
exposed to Sulfoxaflor residues after 24 h and 48 h of spraying this dose was 77.9%
and 76.8%, respectively. As for a dose of 0.192 g i.a./L, regardless of the exposure
time after spraying, 100% mortality was observed in the bees. The median lethal time
(TL50) provided by the Sulfoxaflor insecticide doses was 18.6 hours, the highest, and
3.0 hours, the lowest. Sulfoxaflor impaired the surviving bees' ability to fly. Regardless
of dose and exposure time after spraying, the insecticide was highly toxic to A.
mellifera.