Molecular Identification of Podosphaera xanthii and the Susceptibility of Vigna Species Genotypes to Natural Infection of Powdery Mildew

Powdery mildew was observed on 20 genotypes of Vigna unguiculata subsp. sesquipedalis (yardlong beans) and 33 V. radiata (mungbean) in Los Baños, Laguna, Philippines. collected then subjected to molecular characterization identify the species associated with disease. Based combined microscopic observations identification, causing powdery yardlong bean mungbean Podosphaera xanthii (Castagne) U. Braun & S. Takam. 2000 (Bas.: Erysiphe 1845). None beans were resistant mildew, disease incidence reaching up 100% fungal colonies present plant vines both sides leaves. This is first report caused by P. country. Both legume are important food crops The information from this study will be valuable formulating other management approaches. lack plants warrants further screening germplasm collection sources resistance or tolerance.