水稻新病害——水稻褐变穗

The new rice disease-Browning ear of grain

依据柯赫氏法则,对水稻的一种新病害—水稻褐变穗进行分离培养及病原菌鉴定,按照Ainsworth分类系统进行鉴定,确定分离得到的菌种是链格孢(Alternariaalternata(Fr.)Keissl),通过回接证明了水稻褐变穗确实是由链格孢引起的。其水稻褐变穗的症状是水稻出穗后不久遇强风易发生,粒上出现褐色斑点,严重时变浓褐或黑褐色,病斑不规则形,但水稻叶鞘几乎没有褐变。

Based on Koch＇ postulates, use the isolated culture and identification of pathogenic bacteria to research rice Browning ear of grain. According taxonomy system of Ainswortb to identify. It determine the gainable was Ahernaria alternata （Fr.）Keissl and through test to inspect and verify its authenticity. Its symptom showed that it can happen after heading stage with gale, the grain can appear brown spotting or tabacine, the shape of lesion was irregular, but the vagina had Browning scarcely.