Morphological and Cultural variability in Phytophthora drechsleri f. sp. cajani causing Blight of Pigeon pea

Thirty nine isolates of Phytophthora drechsleri f.sp. cajani from different locations of Uttar Pradesh were collected and categorized on the basis of morphological and cultural variability. On the basis of morphology, radial growth, colony colour and mycelium characters, the isolates were categorized into six groups i.e. fast growing cottony white (6 isolates), fast growing creamy white (10 isolates), moderate growing cottony white (6 isolates), moderate growing creamy white (12 isolates), slow growing cottony white (3 isolates) and slow growing creamy white (2 isolates).