Relative toxicity of phenolics against apple woolly aphid Eriosoma lanigerum Naga K.C.*, Subramanian S., Sharma R.K. Division of Entomology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012 *Email: kailashnaga3j@gmail.com
Online published on 23 October, 2018. Abstract To test the relative toxicity of six phenolics a cut shoot bioassay was performed against the woolly apple aphid (WAA) Eriosoma lanigerum and to assess their role in resistance. The study revealed that none of the phenolics showed the toxicity compared to insecticide, imidacloprid against both adult and nymph. The LC50 values of the phenolics against WAA adult varied from 0.714 to 2.906%. Phenolic, quercetin exhibited the highest toxicity to WAA adult with the least LC50 value of 0.720 found at par with phloridzin dihydrate (LC50, 0.720), rutin hydrate (LC50, 1.361). The least toxicity was observed with ()-catechin (LC50, 2.906) and on par with epicatechin (LC50, 2.577) and chlorogenic acid (LC50, 1.581). The LC50 values of phenolics against nymph varied from 0.540 to 1.497%. Among phenolics the quercetin (LC50, 0.540) showed the highest toxicity against nymphs, found at par with phloridzin dihydrate (LC50, 0.592). The ()-catechin (LC50, 1.497) showed the minimum toxicity and found on par with epicatechin (LC50, 1.309), rutin hydrate (LC50, 1.322) and chlorogenic acid (LC50, 1.471). Top Keywords Apple Woolly Aphid, phenolics, bioassay, toxicity, adult, nymph, quercetin, catechin, LC50, host resistance. Top |