Abstract

MUNIZ-REYES, Erica; RAMOS BARRETO, Carlos Armando; RODRIGUEZ-HERNANDEZ, Cesáreo  and  ORTEGA-ARENAS, Laura Delia. Nim biological activity on adult whitefly Trialeurodes vaporariorum (Aleyrodidae) West. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.6, pp.1283-1295. ISSN 2007-0934.

Chemical insecticides to control Trialeurodes vaporariorum West. have been virtually the only tool used, however the global problem of environmental pollution and insecticides selective pressure, has fostered a change in the way of handling pest to more environmentally friendly and efficient. Nim of Neem Azadirachta indica is an option as botanical insecticides, as its metabolites have already been marketed in different formulations; however it is necessary to evaluate its insecticide and insectistatic action. The objective of this research was to compare the effect on mortality, repellency and oviposition of formulated products of A. indica. In this study four formulations based on neem oil in adults of T. vaporariorum were tested. The products that showed the highest mortality were Neem Oil Spray and PHC Neeem, at a concentration of 0.6 mg mL-1. The best repellent effect was Neem Oil Spray (82.6%), PHC Neeem (72.3%), Biosave Neem (70.8%), and Neemix 4.5 (59.9%); the first two show greater persistence with similar effect the 3 days of evaluation. The best inhibitor of oviposition was Neem Oil Spray (99.6% using 1 mg mL-1), Biosave Neem (92.8%), PHC Neeem (82.6%), and Neemix 4.5 (57%). In contrast, Biosave Neem and Neemix 4.5 stimulated oviposition at concentrations of 0.01 to 0.3 mg mL-1 and PHC Neeem 0.035 mg mL-1. The oil concentration in the formulation is crucial in effect, as to larger proportion, the formulation becomes more persistent, otherwise makes it more polar and its systemic capacity increases.

Keywords : Trialeurodes; Azadirachta; mortality; oviposition; repellency.