Field evaluation of Bacillus thuringiensis for cotrol of Plutella xylostella (l.) on Cauliflower
2010
Mir ud din, Mehraj | Gaurav, S.S. | Prasad, C.S. | Tyagi, Ashish
The field efficacy of Bacillus thuringiensis in comparison of chemical insecticides were carried out against diamondback moth, Plutella xylostella, in cauliflower field. Different formulations of B. thuringiensis (viz., Halt WP, Bioasp WP, Delfin WG and Delfin of @ 0.5 kg/ha) and chemical insecticides (triozophos and malthion @ 800 ml/ha.) were applied with the help of knapsack sprayer in 25 m! plots in evening hours. The spraying was done two times at an interval of 15 days starting from pest occurrence. The result clearly revealed that third day of first spray, all the treatment, increased their efficacy for larval mortality. Trizophos resulted in maximum mortality (91%) followed by malathion (64%) and Halt WP (45%). The data of mortality generated after 5 days of first spray revealed that Halt WP had minimum (63%) larval mortality which was at par with Malathion (63%). Although, Trizophos had maximum of 91% larval mortality followed by Delfin WG (79%) and Bioasp WP (78%) being at par with each other. After seven days of first spray, absolute mortality was observed with treatment Trizaphos, Halt WP (87%), Delfin WG (95%), Delfin OF (94%) and Bioasp WP (94%) mortality, respectively. Similar trend was observed in the second spray after 1, 3, 5 and 7 days after treatment.
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