Abstract
Laboratory studies on parasitizing efficiency of Trichogmmmatoidea bactrae Nagaraja and bioassay of Bacillus thuringiensis Berliner, and field evaluation of these bioagaents alone and in combination were carried out against diamondback moth, Plutella xylostella (Linnaeus) on cabbage. The results indicated that the parasitism of T. bactrae was higher in the eggs of Corcyra cephalonica Stainton (91.36%) than P. xylostella (82.46%) while the adult emergence was more from parasitized eggs of P. xylostella (92.16%) than C. cephalonica (91.40%). The estimated LC 50 value of B. thuringiensis formulation Dipel 8L was 0.043 per cent. Field studies revealed that inundative releases of T. bactrae @50,000 adults/ha/release five times at weekly interval with two intermittent sprays of B. thuringiensis @ 1 litre/ha at 10 days interval commencing from 30 days after transplanting of cabbage resulted in minimum of 0.45 mean surviving larvae of DBM with 84.16 per cent reduction in larval number and maximum yield of 380.2 q/ha marketable cabbage heads, and proved to be the most effective.
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