author(s)
Manasee Hazarika and SK Dutta

abstract
Aiceona robustiseta G&R infestation started in the middle of February and continued till the end of September. Incidence, intensity of attack and population density of A. robustiseta varied during different months. It increased gradually during the warmer months and reached a peak during the end of July. No aphid population were found from October to February. Distribution of A. robustiseta followed contagious or aggregated pattern during the period of investigation. Clumping was due to micro-environmental variation and active behaviour of colony formation.