Technical Abstract: Several fungal species cause powdery mildew of lentil. Erysiphe pisi is the most commonly reported species on lentil. Leveillula taurica also occurs on lentil. E. trifolii is also a species that recently confirmed to be the pathogen of lentil. Infections by Eryisphe species result in small white spots on leaf surfaces. Lesions expand to cover the entire leaf surfaces and pods. Infection can be especially extensive at flowering, and under heavy infection leaves become chlorotic, then curled and necrotic prior to abscission. The powdery mildew pathogens have broad host ranges and both ascospore and conidia may verse as primary inoculum. Moderate temperatures and shady conditions are generally favorable for powdery mildew growth. The use of cultivars resistant to powdery mildew is currently the most practical method, and in general, small-seeded varieties exhibit more resistance. Fungicide sprays are also available for managing the disease.