Periods of low light intensity occur frequently during the reproductive growth of cotton in humid and sub-humid tropics. This paper reports the effects of a 4-days and an 8-days exposure of plants to low light intensity on the survival rate of fruiting forms according to their age and position. Age of fruits was a major determinant of survival rates after the stress. Consequences of excessive abscission on boll distribution and final yield are discussed according to the duration and timing of the stress