Role of Egg Parasitoid, <I>Trichogrammatoidea bactrae</I> Nagaraja alone and in Combination with Dicblorovos in the Management of <I>Plutella xylostella</I> (Linnaeus) on Cabbage

K. I. Singh; S. K. Jalali; R. J. Rabindra; N. S. Rao; Y. Lalitha

doi:10.18311/jbc/2004/4080

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Authors

K. I. Singh
Department of Entomology, College of Agriculture, Central Agricultural University, Imphal 795 004, Manipur ,IN
S. K. Jalali
Project Directorate of Biological Control (lCAR), Post Bag no. 2491, Bellary Road, Hebbal, Bangalore 560 024, Karnataka ,IN
R. J. Rabindra
Project Directorate of Biological Control (lCAR), Post Bag no. 2491, Bellary Road, Hebbal, Bangalore 560 024, Karnataka ,IN
N. S. Rao
Project Directorate of Biological Control (lCAR), Post Bag no. 2491, Bellary Road, Hebbal, Bangalore 560 024, Karnataka ,IN
Y. Lalitha
Project Directorate of Biological Control (lCAR), Post Bag no. 2491, Bellary Road, Hebbal, Bangalore 560 024, Karnataka ,IN

DOI:

https://doi.org/10.18311/jbc/2004/4080

Keywords:

Cabbage, Dichlorvos, Efficacy, Plutella xylostella, Trichogrammatoidea bactrae.

Abstract

The optimum release dosage of Trichogrammatoidea bactrae Nagaraja and its comparative efficacy alone and in combination with dichlorvos against diamondback moth (DBl\1), Plutella xylostella (Linnaeus) on cabbage was worked out. Results of the study on the percentage parasitization under different host-parasitoid ratios revealed that the maximum DBM egg parasitization (83.0%) was recorded in the ratio 100 (eggs): 5 (females), which was on par with other higher ratios of 100:10 to 100:20. The release of T. bactrae twice (2 and 5 days after DBM moth release) proved as the most effective treatment in significantly reducing the larval population (4.89 larvae per plant) in comparison to two sprays of dichlorvos (0.05%) (14.54 larvae per plant). The results indicated the efficacy of T. bactrae in suppressing DBM on cabbage and calls for further evaluation in field trials.