Abstract
Histopathological studies were made in fourth instar larvae of Heliothis armigera (Hbn.) Inoculated with a dose of 10 polyhedra per larva, Histopathological changes were discernible 48 hours after virus treatment. The most susceptible tissues were fat body, hypodermis, tracheal matrix and blood cells. Muscles, nerve tissue toregut, oesophageal valve, connective tissue surrounding the midgut, silk glands and testicular epithelium were also found to be affected by the virus to a lesser extent, Polyhedra could not be observed in the imaginal buds, malpighian tubules and hind gut.
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