During March-April, 1989 a sample survey was conducted on the attack by stcmborcr in the kcora (Sonneratia apetala) 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.

A point sampling method was followed for the survey. The results showed that stocking of kcora trees per hectare was 1645 of which 851 were
infested by stcmborcr. The overall infestation was estimated to be 52% with an average of 61%, 59%, 45% and 44%. in Barisal, Patuakhali, Noakhali and Chittagong Coastal Afforestation Divisions respectively. Intensity of infestation was graded into three groups, viz., slight, moderate and severe. Severely attacked portion showed the highest infestation (22%) compared to tiic slightly (13%) and moderately attacked trees (17%).

A number of qualitative characters, such as plantation composition, plantation age, canopy density and total inundation duration were studied
towards their degree of association with the infestation. Age of die plantations did not show any correlation with the intensity of infestation while inundation duration and plantation composition had significant effects on it.