Polyhedra were extracted from the cadavers of Heliothis armigera infect-ed with VHA-273 strain of Heliothis armigera NPV. Observation under electromicoscope showed that the. polyhedra consisted of MNPV(90%) and SNPV(10%). The purity of polyhedrin purified by serial procedures was confirmed by immunological and electrophoresis methods. When the iso-electric point of the polyhedrin was determined by isoelectric focusing electrophoresis, 7 bands appeared, with the major band at pl 5.78±0.02 and minor bands at ...
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