Abstract
AbstractThe incidence of Phytophthora blight of pigeon pea (Cajanus cajan (L.) Millsp.) caused by Phytophthora drechsleri f. sp. cajani was observed in the whole area of an experimental field plot where the topography varied. There was a positive correlation between low level of the field and maximum disease incidence. The incidence of disease was lowest at high field levels. This may be due to high or low moisture contents in both the levels. Leaf blight developed more rapidly under conditions of night darkness in the field and this was confirmed under conditions of artificial darkness in the glasshouse.
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