Evaluation of the effect of different concentrations of diflovidazine on biological parameters of the Amblyseius swirskii Athias-Henriot (Acari: Phytoseiidae)
Paper ID : 1928-24IPPC (R7)
Authors
1Department of Plant Protection, Faculty of Agriculture, University of Tabriz
2University of Tabriz
Abstract
Evaluations of the lethal and sublethal effects of pesticides on natural enemies are necessary for integrated pest management (IPM) programs. In the present study the sublethal effect of Diflovidazin (Flumite®) in three concentrations LC10, LC20, and LC30 were evaluated on life table parameters of Amblyseius swirskii (Athias-Henriot), an efficient predator of Tetranychus urticae (Koch; 1836). The experiments were carried out in laboratory conditions at 25±2 ºC, 65±5% RH, and a photoperiod of 16:8 ( L: D ) hours. The data were analyzed based on a two-sex life table analysis. Exposure to the sublethal concentrations of diflovidazin showed that in the highest concentration (LC30) (25.20 day), we saw a significant decrease to compare with control (30.17 day). Diflovidazin treatments reduced the longevity and total life span of both sexes. The results showed that sublethal concentrations of diflovidazin significantly affected the fecundity of the treated females of A. swiriskii. The intrinsic rate of increase (r) ranged from 0.1441 up to 0.1251 day-1 for the mites treated with distilled water and LC30 treatments, respectively. The finite rate of increase (λ) was not affected by enhancing of concentration, the values were 1.155 day-1 for the mites treated with distilled water and 1.132 day-1 in LC30 concentration. The gross reproductive rate (GRR), was 10.10 (offspring/individual) at LC10 and 7.73 (offspring/individual) in LC30 treatment. The recorded period for the mean generation time (T), was variable from 16.98 days at control up to 14.76 days at LC30 concentration. The results revealed that the sublethal effects of diflovidazin on some biological parameters of the A. swiriskii were significant, and the results of this study could be used in designing management programs for this pest.
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