论文部分内容阅读
1979年在大连市旅顺口区水师营公社沈家二队发现辣椒白粉病,面积约一亩;1980年后迅速扩大蔓延。现将初步观察结果报道如下:一、发生概况:首先发现在长龄苗辣椒上,品种为上海甜椒(茄门)、保加利亚和上海甜椒×保加利亚的杂交第一代。1981年6月发病,到10月20日左右叶背仍有白粉。露地的辣椒也同样发病。1981年9月下旬在小南四队调查(面积为1.5分)发病株率为100%,病情指数为64。二、症状:开始发生时在叶背支脉间产生一块块白色薄的霜状霉。以后在长霉处开始褪色,出现淡黄色斑块,白霉能够长满整个叶背。当病情发展,叶片变黄,容易脱落,严重时全株叶片落光,仅残留顶部嫩叶,果实不能正常膨大(图1)。
In 1979, Dalian Lushunkou District Naval Camp Commune Shen team found pepper powdery mildew, an area of about one acre; rapid expansion after 1980. Now the preliminary observations are reported as follows: First, the occurrence of the situation: First found in long-sown peppers, the varieties of Shanghai sweet pepper (solanum), Bulgaria and Shanghai sweet pepper × Bulgarian hybrid first generation. 1981 June onset, until October 20 leaves still have white powder around. Ground peppers also have the same disease. In late September 1981 in Xiaonan four teams survey (an area of 1.5 points) the incidence of strain was 100%, the disease index was 64. Second, the symptoms: At the beginning of the back of the branch vein to produce a piece of white creamy mildew. After the mold at the beginning of fading, yellowish patches appear, white mold can cover the entire leaf back. When the disease develops, the leaves turn yellow, easy to fall off, the whole plant leaves falling light, leaving only the top leaves, the fruit can not normal enlargement (Figure 1).