Developments in rice seed health testing policy.
The state of rice seed health testing and certification in South-East Asia is reported. Rice seed health is introduced as a factor which is essential to sustainable crop production, followed by an account of activity of the International Rice Research Institute (IRRI) to test seeds and ensure quarantine regulations, in conjunction with other authorities. Criteria for determining the need for quarantine of rice are outlined. Reports are given of the detection frequency of seedborne pathogens and seed infection levels taken from 26 755 seedlots which entered any South East Asian country in 1991-95. Frequency of detection of Alternaria padwickii, Curvularia spp., Sarocladium oryzae, Fusarium moniliforme [Gibberella fujikuroi], Bipolaris oryzae, Tilletia barclayana and Pyricularia grisea [Magnaporthe grisea] in rice are graphically represented. Risk analysis of seedborne pathogens is discussed.