Symptoms and pathology of nuclear polyhedrosis of Amsaca albistrigo were studied.Caterpillars in advanced stage of infection lost all hair and gave a naked appearance and the colour turned brick red.Infected caterpillars were very restless.The incubation period increased and the mortality decreased as the age increased.Length of infected caterpillars was severaly affected by virus infection.The haemolymph turned milky white in caterpillars which were in advanced stage of the disease.
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