Permethrin-induced hormesis on the predator Supputius cincticeps (Stål, 1860) (Heteroptera: Pentatomidae)
2003
Zanuncio, Teresinha Vinha | Serrão, José Eduardo | Zanuncio, José Cola | Guedes, Raul Narciso C.
The effect of permethrin on development of Supputius cincticeps (Stål) (Heteroptera: Pentatomidae) was evaluated to determine if exposure to low doses of toxic agents can stimulate the performance of this predator, a phenomenon known as hormesis. Permethrin at intermediary doses (5.74×100(-3), 5.74×10(-2), 5.74×10(-1) and 5.74 ppb) shortened the duration of the third instar for female nymphs (F=4.15, p<0.05) and increased the duration of the fifth instar for male nymphs (F=5.18, p<0.05), the weight gain of females (F=3.87, p<0.05) and the survival (F=4.34, p<0.05) of S. cincticeps. The pre-oviposition period of this predator was reduced with doses of 5.74×10(-3) and 5.74×1(-2) ppb (F=4.15, p<0.05) which suggests the occurrence of hormesis. However, oviposition period, number of egg masses and eggs per female, number of nymphs, nymph viability and adult longevity were not affected by permethrin. Permethrin selectivity to S. cincticeps reported in other articles and the favorable effects with sub-lethal doses stimulating the predator development suggest the potential of the combined use of this insecticide and predatory species in integrated pest management programs.
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