Abstract
Experiments were conducted on the life history, feeding and reproductive potential of Colasposoma semicostatum on Impatiens thomsoni, a weed in Deodar forests and alternate host plants of this beetle were also found. The life-span (from hatching till death of adult) was found to be 58.98 days. A female laid 200-250 eggs. The maximum feeding activity was recorded for the adult stage, i.e., 37.56 cm2. The results showed that 595.42 insects can control 1 m2 of this weed in their life span, i.e., from first instar larvae till the death of adult. Only one alternate host plant of C. semicostatum, i.e., Populus ciliata was recorded out of 20 species.
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