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Transgenerational sublethal effects of abamectin and pyridaben on demographic traits of Phytonemus pallidus (Banks) (Acari: Tarsonemidae)

Hedayati, Mozhgan, Sadeghi, Amin, Maroufpoor, Mostafa, Ghobari, Hamed, Güncan, Ali
Ecotoxicology 2019 v.28 no.4 pp. 467-477
Phytonemus pallidus, abamectin, eggs, fecundity, females, integrated pest management, life tables, longevity, males, mites, parents, pests, progeny, pyridaben, strawberries, sublethal effects
In addition to determining the lethal effects, identifying sublethal effects of a pesticide is crucial to understanding the total impact a pesticide may have on a pest population. We determined the sublethal effects the two pesticides, abamectin and pyridaben, have on the cyclamen mite, Phytonemus pallidus (Banks) (Acari: Tarsonemidae)—a major pest of strawberry. Demographic traits of the P. pallidus progeny (F1 generation) produced by parents (F0 generation) treated with a low lethal concentration (LC₁₅) of abamectin and pyridaben were assessed using the age-stage, two-sex life table theory. The total longevity of the F1 generation (males = 10.78 days; female = 14.35 days) was the shortest in the progeny of the abamectin treated parents, differing significantly from the progeny of mites treated with pyridaben (males = 11.50 days, females = 15.63 days), and the control population (males = 13.50 days, females = 17.81 days). The intrinsic rates of increase (r) and the finite rates of increase (λ) of the progeny of abamectin (r = 0.0854 day⁻¹, λ = 1.0891 day⁻¹) and pyridaben (r = 0.0951 day⁻¹, λ = 1.0997 day⁻¹) treated parents were significantly lower than in the control mites (r = 0.1455 day⁻¹, λ = 1.1567 day⁻¹). The lowest fecundity (5.35 eggs/female), occurred in F1 female offspring of parents treated with LC₁₅ concentrations of abamectin, which was significantly lower than in the pyridaben (6.11 eggs/female) and control treatments (11.45 eggs/female). Transgenerational sublethal effects of abamectin and pyridaben in P. pallidus can be effectively used to for optimizing IPM programs against this pest on strawberries.