Pathogenic fungi intercepted in exotic oil-seeds, there significance and control

摘要

Introduced germplasm of oil-seed crops in one of the key factors in doubling the oil-seed production from 10.83 milion tonnes in 1985-86 to 22.50 million tonnes in 1994-95. During last two decades, more than 37,000 oil-seed germplasm accessions were introduced in Brassica spp., sesamum safflower, sunflower, soybean, castor and groundnut etc. A number of pathogenic fungi of quarantine significance were intercepted. These include Peronospora manshurica (downy mildew) in soybean, Puccinia carthami (rusts) in safflower and P. helianthi in sunflower, Phoma lingam (black leg) in Brassica spp., Alternaria sesami (leaf blight) and Cerocospora sesamicola (leaf spot) in sesamum and Phomopsis sp. (Phomopsis blight) in castor. The significant of intercepted fungi is discussed and the methods employed for salvaging are elaborated.