?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=R+P&rft.au=Thakur%2C+R+P&rft.aulast=Thakur&rft.atitle=Downy+mildews+of+India&rft.title=Crop+Protection&rft.date=2002&rft.volume=21&rft.pages=333-345&rft.issue=4&rft.genre=article