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The nature and extent of damage of shoot borer, Hypsipyla robusta
(Moore) Lepidoptera: Pyralidae was studied in 2-8 years old Chukrasia velutina
Wight et Arn. plantations in hilly areas of Chittagong, Bangladesh.
A single tree could have attacked several times in the season. About 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 good number of trees (60%) were found to exhibit recovery trend
after the infestation while other trees were with the formation of fork, cork,
knot, curve, twist, whorled branching from the point of infestation (Mostly
at a height of 2-3 m). It was estimated that about 42% potential biomass production
was lost due to the infestation. Apart from that, some trees were found to show
an encouraging `resistance` character keeping intact themselves against the
infestation that referred an ample scope of propagation and plantation in future
for a better inheritance.
