Department of Entomology, College of Agriculture, Central Agricultural University, Imphal, India, 795004
*Corresponding author E-mail: lakshmidung12@gmail.com
Online published on 27 December, 2023.
The experiments conducted at Bio-control laboratory and Shade net house of Entomology department, College of Agriculture, CAU, Imphal during November- March, 2021-22 revealed that the optimum release dosage of T. chilonis on diamond/back moth (DBM) eggs in 100:5 host parasitoid ratio accounted for highest per cent parasitization (83.6%) as against lowest per cent parasitization (40.6%) at 100:1 host parasitoid ratio. The results also revealed that parasitoid emergence increased with the increase in parasitoid number and maximum adult emergence (98.6%) was observed from 100:20 ratio indicating emergence of more than one adult from a single egg. Two release of T. chilonis @ 5 adults plant−1 twice (2 and 5 days after DBM moth release) was found to be most effective treatment followed by combined application with malathion i.e. T. chilonis @ 5 adults plant−1 once + one spray of malathion (1 ml l−1) against the pest recording lowest larval population of 4.6 and 6.55 per plant, respectively. The results indicated that T. chilonis is a very efficient parasitoid in suppression of cabbage DBM (Plutella xylostella) under Manipur condition and can be explored as a potential bio control agent against lepidopterous insect pests of agricultural importance.
Trichogramma chilonis, Corcyra cephalonica, Plutella xylostella, Developmental period, Adult longevity, Parasitism, Emergence, Temperature, Malathion
