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目前,对引起油菜龙头病发生的病菌侵入时期,说法不一,防治上也尚未找到较理想的办法,1978年,我们在这方面作了一些试验,现整理如下。一、油莱龙头病病菌最易侵入期观察。对此,我们作了两方面工作。(1)大田系统调查。选择生育期不同的油菜田8块,每块固定25株,从3月16日到4月27日,每两天调查一次新增病叶与病孢子破裂数(病孢子破裂后用漆涂去),并记载当日油菜的生育期。约到5月初,龙头病发病停止后,各种类型田调查1000株,统计龙头病发生情况,结果见表1。(2)室内接菌。将苔期、始花、盛花三种生
At present, there are different opinions on the stage of invasion of pathogens causing the leading problem of rape and we have not found an ideal solution yet. In 1978, we conducted some experiments in this regard and are summarized as follows. First, the most susceptible to inaudible observation. In this regard, we have done two things. (1) Daejeon system investigation. Select the different growth stages of rapeseed 8, each fixed 25, from March 16 to April 27, every two days to investigate the number of diseased leaves and spores rupture (the spores rupture with paint ), And record the date of rape’s growth period. About early May, after the onset of the leading disease was stopped, 1000 strains of various types of fields were investigated, and the incidence of the leading disease was counted. Table 1 shows the results. (2) indoor bacteria. The moss period, the beginning of flowers, flowers three kinds of students