Abstract
The morphology of a nuclear polyhedrosis virus of Ectropis crepuscularia Schiff., the histopathology of the disease, and deoxyribonucleic acid (DNA) synthesis during the disease process were studied. The polyhedral inclusions measure 1.4 μ in diameter with a range of 0.8–2.1 μ. The virus particles are rods measuring 319 mμ by 79 mμ with a range of 280–360 mμ by 70–110 mμ. DNA labelling and nuclear swelling follow the course of previously described polyhedrosis virus diseases.

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