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Susceptibility of the pistachio processionary mothThaumetopoea solitaria to threeBacillus thuringiensis products

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Abstract

The susceptibility of larvae ofThaumetopoea solitaria Freyer (Lepidoptera; Notodontidae, Thaumetopoeinae), fed on treated pistachio foliage, to three commercial control products derived fromBacillus thuringiensis (Bt), was evaluated in the laboratory. Both Dipel DF and Delfin WG were highly effective against 1st and 2nd instar larvae at relatively low concentrations (LC50: 0.01–0.04%), whereas mortality of the 3rd instar larvae reached 50% only at a Dipel DF concentration of 0.2%. The third formulation, Foray 48B, was significantly less toxic toward all tested larval instars. The susceptibility ofT. solitaria toBr decreased progressively between molts, and then increased steeply during the first days following each molt. Use of the film-forming polymer Nu-Film as a wetting agent and spreader-sticker for the commercial formulation of Dipel DF improvedBt adhesion to extremely hydrophobic youngPistacia foliage, and significantly increasedBt persistence under ambient conditions. Addition of Nu-Film improved the leaf surface coverage and extended the duration of rainproofing.

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Gindin, G., Kuznetsova, T., Protasov, A. et al. Susceptibility of the pistachio processionary mothThaumetopoea solitaria to threeBacillus thuringiensis products. Phytoparasitica 36, 472–482 (2008). https://doi.org/10.1007/BF03020293

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