Abstract
A significant loss in the weight of larvae was observed due to virus infection, which was, more pronounced in III, IV and V instars. Yield of occlusion bodieS (OB) was low in II instar (59.6×10 7 /larva) and high in IV (187.1×10 7 ) and V (182.7×10 7 /larva) instars. Positive correlation existed between larval weight and virus recovery and 10 5 OB was the optimum dose for virus production. Different instars of field collected larvae with virus symptoms yielded 71.6 to 202.1×10 7 OB/larva. The yield of OB from male pupa was significantly low (74.7×10 7 pupa) compared to female pupa (192.0×10 7 /pupa).
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