Control of Seedling Blast of Rice with Ultraviolet-Absorbing Vinyl Film. Yuichi Honda, Morioka Branch, Vegetable and Ornamental Crops Research Station, Shimokuriyagawa, Morioka 020-01, Japan. Masayasu Nemoto, Tohoku National Agricultural Experiment Station, Shimokuriyagawa, Morioka 020-01, Japan. Plant Dis. 69:596-598. Accepted for publication 16 January 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-596.

Almost 99% of 386 monoconidial isolates of Pyricularia oryzae were light-dependent for sporulation, whereas only 1% (four isolates) were light-independent. Without fungicides, rice (Oryza sativa) seedling blast incidence in the nursery at the four-leaf stage was reduced to less than 10% in an ultraviolet-absorbing vinyl film greenhouse compared with incidence levels in a common agricultural vinyl film greenhouse.