Abstract

Alcterogystia cadambae [Cossus cadambae] (Moore) is an important pest of teak (Tectona grandis) in some parts of Kerala, Tamil Nadu and Karnataka States in India, attacking standing teak trees. It causes extensive bark injury and riddling of the bole with numerous holes. The infested tree subsequently gets attacked by various pathogenic/saprophytic fungi which results in die-back as well as decay of wood. A sample survey in Kerala indicated the prevalence of the pest in nine Forest Divisions. The highest percent incidence was recorded in the Kothamangalam Division (20) followed by Trichur (19) and Nemmara (19) . Based on the intensity of damage, the affected trees were grouped into four score classes, the 3rd class representing very seriously damaged trees and the 4th class representing trees which were dead due to infestation. Trees which fall under the 3rd and 4th categories constituted 30 percent in some plantations in Trichur, 19. 4 percent and 20. 2 percent in Kothamangalam