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Efficacy of certain plant extracts on the biometrics'of the two-spotted spider mite,tetranychus urtcae (koch)h[electronic resource].

By:

Hegazy, H. Wafaa

Language: English Summary language: Arabic Description: p.675-690Other title:

تأثير بعض المستخلصات النباتية كمبيدات أكاروسية على بعض الخصائص البيولوجية للأكاروس تترانيكس اورتيكا [Added title page title]

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Journal of agricultural research Tanta University, 2006 v.32 (3) [electronic resource].

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In: Journal of Agricultural Research Tanta Univeristy 2006.v.32(3)Summary: The present study evaluated the residual effects of two plant extracts (black cumin and wormseed) on the two-spotted spider mite, Tetranyehus urtieae (Koch). The results indicated that black cumin was more toxic than wormseed to adult females of T. urtieae with LC50. (887 and 1861.3 ppm.) respectively. The obtained results concluded that the black cumin and wormseed (plant extracts) proved to be more toxic to older eggs than to younger ones with LC50. values of 6744, 8027, 5051,6011,3219 and 4949.91 ppm. respectively for the 1day, 2-days and 3-days old eggs of T. urtieae. Black cumin and wormseed highly reduced the number of eggs deposited compared to the control treatment. Black cumin had a moderate effect on egg hatchability, while wormseed extract was the least effective one. Black cumin also, had a moderate effect on sterility followed by wormseed. The tested plant extracts had the ability to elongate the duration needed for all immature stages and life cycle, while they were able to decrease ovipositiml period and the adult f~male longevity.

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The present study evaluated the residual effects of two plant extracts (black cumin and wormseed) on the two-spotted spider mite, Tetranyehus urtieae (Koch). The results indicated that black cumin was more toxic than wormseed to adult females of T. urtieae with LC50. (887 and 1861.3 ppm.) respectively. The obtained results concluded that the black cumin and wormseed (plant extracts) proved to be more toxic to older eggs than to younger ones with LC50. values of 6744, 8027, 5051,6011,3219 and 4949.91 ppm. respectively for the 1day, 2-days and 3-days old eggs of T. urtieae. Black cumin and wormseed highly reduced the number of eggs deposited compared to the control treatment. Black cumin had a moderate effect on egg hatchability, while wormseed extract was the least effective one. Black cumin also, had a moderate effect on sterility followed by wormseed. The tested plant extracts had the ability to elongate the duration needed for all immature stages and life cycle, while they were able to decrease ovipositiml period and the adult f~male longevity.

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