Ecology, Environment and Conservation Paper

Vol.05, Issue 02, 1999; Page No.(Studies on rate)

STATUS OF LARVAL POPULATION AND DAMAGE TO TEA OF ANDRACA BIPUNCTATA WALKER (LAPIDOPTERA : NOTODON- TIDAE) AT DARJEELING HIMALAYAN REGION

A. Panigrahi

Abstract

Studies on rate of larval population of Andraca bipunctata Walker in tea gardens at Sukiapokhri, Lebong, Ghoom and Sonada and .her food consumption capacity on tea leaves in laboratory were made to assess the status of the pest in these respects at Darjeeling Himalayan Region. The larval population infestation and damage to tea varied in respect to instar, generation and area. On average, 85.24, 68.08, 70.16, 56.56, 41.68 larvae of first, second, third, fourth, fifth instars respectively of summer generation and 67.57, 54.56, 40.31, 31.50, 21.99 of the respective instars. of winter generation infested per tea plant. Rate of damage to tea leaves by the larvae gradually increased with instars, and on average, consumed 388.61 g and 178.01 g tea leaves per plant during feeding periods by a larval population of summer and winter generation respectively.

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