Shoot borer, Hypsipyla robusta Moore (Lepidoptera: Pyralidae) infestation on Chukrasia velutina Wight et Arn. in hilly areas of Bangladesh.
The nature and extent of damage of shoot borer, H. robusta, were studied in 2-8 years old C. velutina plantations in the hilly areas of Chittagong, Bangladesh. A single tree could have attacked several times in the season. Approximately 47% C. velutina trees were found to have attacked at least once in their lifetime. The infestation rate was more pronounced on the hill slopes (56%) than on the valleys (37%). A high number of trees (60%) exhibited recovery trend after the infestation while other trees had formation of fork, cork, knot, curve, twist, whorled branching from the point of infestation (mostly at a height of 2-3 m). Approximately 42% potential biomass production was lost due to the infestation. Some trees were found to show an encouraging 'resistance' against the infestation that referred an ample scope of propagation and plantation in the future for a better inheritance.