Toxicity of natural and organic insecticidal products to greenhouse whitefly, Trialeurodes vaporariorum (Westwood) (Aleyrodidae: Hemiptera)

Abstract

Abstract Lethal toxicity of six natural and organic insecticidal products namely, Darekastra, Dashparni, fermented buttermilk, fermented cow urine, Tamarlassi and vermiwash to second instar nymphs of greenhouse whitefly, Trialeurodes vaporariorum was evaluated using leaf dip method of bioassay. The insecticidal products evaluated at six concentrations ranging from 1.25 to 40.00% proved to be progressively more lethal to second instar nymphs with an increase in concentration resulting in mortality varying from 1.67 to 7.33% and 43.33 to 62.96 at concentrations of 1.25 and 40.00%, respectively. Tamarlassi proved most toxic against the nymphs. The order of toxicity was Tamarlassi = fermented buttermilk ≥ fermented cow urine ≥ Dashparni ≥ Darekastra ≥ vermiwash.