Journal of Environmental Biology

Host instar susceptibility and stage specific predatory potential

of stink bug Eocanthecona furcellata on

tasar silkworm Antheraea mylitta

H. Gadad^*, A. Bhagat, A.H. Naqvi and S. Kutala

Central Tasar Research and Training Institute Ranchi-835 303, India

*Corresponding Author Email : hsgadad@gmail.com

Received: 02.11.2021                                                                                               Revised: 18.02.2022                                                                                        Accepted: 31.03.2022

Abstract

Aim: The study was conducted to find out the susceptible stage of tasar silkworm larvae to predation by stink bug and stage dependent feeding potential of stink bug over different instars of tasar silkworm.

Methodology: Susceptibility of silkworms was studied by recording the daily larval mortality of all silkworm stages (1^st to 5^th instar) due to predation by E. furcellata. Stage specific predatory potential was estimated by recording the number of larvae required to complete each developmental stages (2-5^th Nymphal instars and adult male and female).

Results: Experimental results revealed that 1^st and 2^nd instar silkworms were most susceptible towards the attack of both nymphal and adult stages of stink bug whereas 3^rd instar silkworms were moderately susceptible, however, third instar onwards susceptibility of tasar silkworm towards E. furcellata was negligible. Further stage specific cumulative predatory potential revealed that adult females of predatory bug were significantly more damaging to first instar silkworms (F= 125.20; df=5, 24; P= ≤ 0.0001) as compared to other stages by recording more larval consumption. Observations were also made on the second instar silkworms and it was observed that female adults were again superior over other stages of predatory stink bug (F= 135.30; df=5, 24; P= ≤ 0.0001). Similar trend of feeding potential was also recorded on 3rd instar silkworms; however, the rate of feeding was comparatively lesser than the first and second instar silkworms.

Interpretation: Early instar silkworms were less defensive to predators attack, and were highly vulnerable to stink bug, however, as silkworm reached third instar, larvae started depending themselves by rapid head/thoracic movement to ward off the stink bugs. Significant difference in the feeding potential between different developmental stages was observed and adults being superior in feeding indicates their higher nutritional requirements as they need to be fit for reproductive performance to continue their progeny.

Key words: Eocanthecona furcellata, Larval susceptibility, Predatory potential, Tasar silkworm

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