Abstract
A description is provided for Erysiphe betae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Beta corolliflora, B. intermedia, B. maritima, B. trigyna, B. vulgaris and B. vulgaris var. cycla (Hirata, 1966). DISEASE: Powdery mildew of sugar beet. GEOGRAPHICAL DISTRIBUTION: Africa (Libya); Asia (Iran, Israel, Japan, Lebanon, Turkey); Europe (widely distributed). (Hirata, 1966). TRANSMISSION: Not known. However, seed treatment with 2, 4-D, heterosuxin, gibberellin and succinic acid has been reported to lower infection (44, 1315).