During March-April, 1989 a sample survey was conducted on the attack
by stcmborcr in the kcora (Sonneraiia apctala) plantations of Chittagong,
Noakhali, Barisal and Patuakhali Coastal Afforestation Divisions. The survey
was made in the plantations established from 1967 to 1985 covering 76,624 ha
land. The purpose of the survey was to estimate the overall intensity of
infestation in different Coastal Afforestation Divisions as well as to establish
relationships of the infestation will) some other parameters.