晚稻矮缩病和暂黄病预测模式的验证

 本文叙述了晚稻矮缩病和暂黄(黄矮)病预测模式(Y=(n·d·p·t)/x)的验证方法及结果。预测模式经6个单位在浙、皖两省6个不同病区进行联合试验结果,证明它能在发病株率为0~33.74%的不同发病条件下比较准确地预测双季晚稻矮缩病和暂黄病的发病程度,并说明第二代黑尾叶蝉(Nepho-tettix cincticeps)带毒率的及时检测是该模式能付之实用的一个技术关键。

VERIFICATION OF AN EQUATION FOR PREDICTING RICE TRANSITORY YELLOWING AND RICE DWARF DISEASES

The rice transitory yellowing and rice dwarf are two important virus diseases of rice in South China.An equation for the prediction of transitory yellowing and dwarf diseases was verified by results from cooperative research in 6 different disease-prone areases of Zhejiang and Anhui provinces during 1978-1980.The percentages of diseased plants calculated with this equation from the experimental resultsin 12 years all approximated to those observed in the late rice fields.It shows that this equation was able to predict fairly accurately both diseases when their incidences were with in the range of 0~33.74% in late rice fields.Simultaneously,it was also indicated that the detection of viruliferous rate of vector insects is a key technique for foreccasting the incidence of these diseases.