<正> We collected infection plants of rice bakanae desiease from 22 counties (cities) in Hubei Province in 1990-1992. Thirty five isolates of single spore were
<正> In recent years,it has been demonstrated that thelow-level jet streams(LLJs)developed in thesouth of the Meiyu(Baiu)front play a critical role inthe overse
Whitebacked planthopper (WBPH) is a kind of long-distance migrator- pest. Its occurring amount is closely related to the climate change of large sphere. In rece