Biological and toxicological studies of predatory mite Phytoseiulus persimili athias-henriot s (Host preference) on Tetranychus urticae koch and Tetranychus cucurbitacearum on soybean plants

Abd El- Rahman HA; Abd El–Salam A Farag; Nesma E Mohamed

Biological and toxicological studies of predatory mite Phytoseiulus persimili athias-henriot s (Host preference) on Tetranychus urticae koch and Tetranychus cucurbitacearum on soybean plants

Authors
Abd El- Rahman HA, Abd El–Salam A Farag, Nesma E Mohamed

Abstract
Three compounds were evaluated for their toxicity to the adult stage of the two-spotted spider mite T. urticae and T. Cucurbitacearum in this study, which included laboratory and field tests. The predatory mite Phytoseiulus persimilis was studied during in the life span of the predatory mite Phytoseiulus persimilis four compounds, abamectin, biofly, and two extract oils (moringa oil and garlic oil) on mites using the leaf disc technique. Moreover, to evaluate all stages of development of P. persimilis, which feeds on T. urticae and T. Cucurbitacearum, following exposure to different concentrations of these compounds on soybean plants in the field to adult females of T. urticae and T. Cucurbitacearum, the most toxic compound was abamectin, whereas biofly had a moderate toxicity to adult females of T. urticae and T. Cucurbitacearum, moringa oil and garlic oil were the least toxic. Also, abamectin had the highest toxicity index to adult females of T. urticae and T. Cucurbitacearum, whereas biofly had a moderate toxicity to adult females of T. urticae and T. Cucurbitacearum. Moringa oil and garlic oil were the most toxic to adult females. according the toxicity index. T. urticae and T. Cucurbitacearum adult females are not toxic to garlic oil. The effects of various concentrations of four compounds on T. urticae and T. Cucurbitacearum in evaluating the stages of development of P.persimilis, which feeds on T. urticae and T. Cucurbitacearum. When we applied abamectin on T. urticae and T. Cucurbitacearum, the immature stages of P.persimilis were 5.34 and 4.40 days, respectively, compared to the control of 6.4 and 6.05 days, and the adult longevity was 4.80 and 4.20 days, respectively, compared to the control of 12.4 and 12.00 days. The proportion of hatching eggs in abamectin was 30.23 % and 31.21%, respectively, as compared to the control, which had a ratio of 98.48% when a predator ate T. urticae and T. Cucurbitacearum, and 95.61 % when a predator consumed T. urticae and T. Cucurbitacearum abamectin. In the second season in the field on soybean plants, the results were similar.

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