One hundred and four isolates of
Phytophthora infestans were collected during 1990–93 from different potato growing regions of India. They were paired with mating type A1 of
P. capsici to determine their mating type. All isolates from the Indo-Gangetic plains and Assam were the A1 mating type, whereas a mixed
population of A1 and A2 types occurred at Shillong, Darjeeling and Shimla hills. The frequency of A2 isolates was 5–30% in
the Shimla hills and 60% and 58% respectively in the Shillong and Darjeeling hills.
Additional keywords late blight - oospore - mating type - amphigynous antheridium