Himachal Journal of Agricultural Research

Nitika Negi ¹, P.C. Sharma ¹, P.K. Sharma ¹

Affiliations
1 Department of Entomology, College of Agriculture CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur-176 062,, IN

Abstract

The investigation was conducted to study the intrinsic toxicity of Agniastra, Brahmastra, azadirachtin, Bacillus thuringiensis, emamectin benzoate and spinosad against neonate larvae of Leucinodes orbonalis by residue film method of bioassay under laboratory conditions. The results revealed that LC value of the emamectin 50 benzoate was found to be minimum (0.0043 ppm), followed by spinosad (0.0303 ppm), Bt (3.989 ppm), azadirachtin (8.847 ppm), Brahmastra (24203.194 ppm) and Agniastra (29795.975 ppm). Almost similar trend in LC values was observed.

Keywords

Toxicity, Leucinodes orbonalis, insecticides, biopesticides and natural products.

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Shalika Kumari ¹, Ajay K. Sood ¹, P.K. Sharma ¹

Affiliations
1 Department of Entomology CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur-176062,, IN

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.

Keywords

Greenhouse whitefly, toxicity, natural products, organic insecticidal products.

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