Abstract
Tests on the quantitative adsorption of polyhedra of nuclear polyhedrosis virus of Heliothis armigera to black and red soil showed an increase in the adsorption of polyhedra with an increase in the amount of soil. The increase was higher in the red soil than black soil, but the number of polyhedra adsorbed per unit weight of soil decreased as the amount of soil increased; the rate of decrease being faster in black soil than in red soil. The adsorption of polyhedra of nuclear polyhedrosis virus of Heliothis armigera is discussed based on certain physico-chemical properties of both red and black soils.
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