Occurrence and distribution of recently introduced sunflower downy mildew in Maharashtra.
In 1984, severe downy mildew [Plasmopara halstedii] occurred on sunflower cultivars Morden and EC-68414 in Isthala, Beed district, Maharashtra, India. During 1984-89, the disease spread to other villages in Latur and Osmanabad districts forming an initial endemic pocket where the disease regularly occurs. By 1989-90 the disease had spread to Western Maharashtra and Vidharbha in Maharashtra, and Karnataka and Andhra Pradesh. It is concluded that quarantine measures need to be implemented to prevent spread of the disease.