Biology of a predatory bug Eocanthecona furcellata Wolff (Hemiptera : Pentatomidae) on Vapourer tussock moth larvae: a major pest of tasar silkworm food plants

Abstract

Tropical Tasar culture is forest and agro-based activity that covers agricultural and industrial activity. Tasar silk is produced by the silkworm, Antheraea mylitta which is polyphagous in nature. A large number of pests are reported to attack both the host plant as well as silkworm. As the rearing is conducted outdoor silkworms are exposed to attack of various pests during their life cycle. Eocanthecona furcellata (Hemiptera: Pentatomidae) is the major predator of tasar silkworm during young age rearing. Both nymphs and adults of the stink bug suck the heamolymph of silkworm leading to death. The present work was undertaken to study the life cycle of E. furcellata on larvae of vapourer tussock moth which is a major pest of tasar host plants. The incubation period, nymphal duration and total developmental period from egg to adult was <TEX>$8.0{\pm}0.45d$</TEX>, <TEX>$16.0{\pm}3.24$</TEX> and <TEX>$22.0{\pm}4.20d$</TEX>, respectively. Pre-oviposition, oviposition and longevity of male and female stink bug was <TEX>$3.20{\pm}0.38$</TEX>, <TEX>$17.60{\pm}1.86$</TEX>, <TEX>$42.40{\pm}1.94$</TEX>, <TEX>$37.00{\pm}3.18d$</TEX>, respectively. Analysis of the data revealed no significant difference in life cycle of the predator when provided silkworm and vapourer tussock moth larvae as hosts. Which clearly indicates that E. furcellata can multiply on vapourer tussock moth larvae during non rearing periods. Adoption of recommended pest control measures for defoliators of tasar host plants during non-rearing periods will help in reducing the incidence of host plant pests and also in reducing the incidence of stink bug during rearing season. During the study it was also observed that larvae semilooper, boll headed caterpillar and nymphs of leaf hopper serve as alternate/secondary hosts to E. furcellata during non rearing seasons.