Incidence of stem borer, Celosterna scabrator Fab. (Cerambycidae: Coleoptera) on three grape varieties

Abstract

Grapevine encounters group of pests. Among them, the stem borer Celosterna scabrator Fab. (Cerambycidae: Coleoptera) causes severe damage to grape. A fixed plot and roving survey were conducted during 2017-18 in three districts of Karnataka (India) to study the variations in the level of incidence of C. scabrator on three varieties of grapes namely Thompson seedless, Manikchaman and Sonaka. Non-significant difference was recorded between three varieties of grape with respect to the population of adults and twig damage per vine. Significant difference was recorded during fixed plot surveys between three varieties with respect to mean percent exit holes and live holes and total mean percent incidence. Highest total mean percent incidence was recorded in Thompson seedless (86.30) followed by Manik chaman (64.40) and Sonaka (56.60). Similarly, during roving surveys, Thompson seedless recorded maximum total mean percent incidence (38.70) followed by Manikchaman (28.20) and Sonaka (24.90).