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Laboratory evaluation of neem formulations with and without additive against the two spotted spider mite, Tetranychus urticae Koch

Dimetry, N.Z.; Amer, S.A.A. and Saber, S.A.

2008 - Volume: 48 Issue: 3-4 pages: 171-176
Date accepted: 2008-10, Date published: 2009-05-29

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toxicological biological activity; Neem Azal T/S; T/S Fort; Tetranychus urticae
Neem Azal T/S (commercial formulation of Neem seed kernel extract) was tested for its efficacy as a deterrent, toxicant or growth inhibitor against the two spotted spider mite, Tetranychus urticae Koch. Addition of T/S Fort increased its effect on mite females and eggs. Neem Azal T/S with T/S Fort at the ratio of 1:2 showed the highest acaricidal activity compared with the other formulations tested. Newly emerged females sprayed with the median concentration (0.086%) of Neem Azal T/S induced a serious chronic effect on their biotic potential. A high significant reduction in the egg production with an increase in percent of female sterility and a significant decrease in longevity were recorded. However, egg hatchability was slightly reduced while durations of immature stages were significantly increased.

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Photos: Varroa destructor (Varroidae) on a honey bee. Low temperature -Scanning electron microscopy photograph. Material collected and fixed for LT-SEM: J. Pettis, USDA-ARS-Bee Lab. and R. Ochoa, USDA-ARS-SEL; LT-SEM photo: E. Erbe and C. Pooley, USDA-ARS-CEMU © USDA; Petrobia harti (Tetranychidae) © INRA - Alain Migeon; Dermanyssus gallinae (Dermanysssidae) © Ecole Nationale Vétérinaire de Lyon - Lise Roy; Adult Ixodes sp. (Ixodidae) engorging on an Atlantic puffin Fratercula arctica © Andy Darrington; Panonychus ulmi (Tetranychidae): hatching of a winter egg © Université de Lausanne - Centre de microscopie électronique - Cazelles

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