论文部分内容阅读
本调查研究分析表明杂交稻制种田母本稻粒黑粉病的发生与穗层及包颈有很大的关系,穗层越高,发病率越低。主茎高度低于分蘖,发病率则明显高于后者,在重病田中这一关系表现得更为明显;同一蘖位中,下层穗发病率为上层穗的2.34～4.69倍。包颈率与发病率呈正相关。6184/006。江农ⅡA/HR1004两组合株高(简称A.B组合株高)相当,其包颈率B/A=2.36,发病率B/A=3.59;同一穗层中,包颈株的病粒率明显高于不包颈株;如果包颈率较低,包颈对病粒率影响较小。
The investigation and analysis showed that the occurrence of maize powdery mildew in hybrid rice farming is closely related to the panicle and the neck of the ear. The higher the panicle, the lower the incidence. The main stem was lower than the tiller, the incidence was significantly higher than the latter, and the relationship was more obvious in the severe disease field. In the same tiller position, the incidence of lower panicle was 2.34 ~ 4.69 times higher than that of the upper panicle. Bag neck rate and the incidence was positively correlated. 6184/006. Jiangnong Ⅱ A / HR1004 had the same plant height (referred to as AB combined plant height), with a ratio of B / A = 2.36 and B / A = 3.59. Without neck package; if the package neck rate is low, the impact of the package neck on the disease rate is small.