论文部分内容阅读
定点定株系统调查发现，炭疽病主要集中在３层果枝下的第２果节以内，其发病率沿开花顺序递减；疫病则主要分布在７层果枝以下，棉铃离地越近，发病率越高。棉铃的成熟程度及气温决定了炭疽病的分布形式，上述两因子加上棉铃离地高度，决定了疫病的分布形式。６月底至７月初对早发移栽棉人工或化学去除基部３层果枝上部分早蕾，可抬高棉花开花结铃部位，优化结铃模式，提高棉花产量和品质，对烂铃的防效可达２５．５％～６８．９８％。
The results showed that anthracnose mainly concentrated in the second fruit section under the 3-layer fruiting branch and its incidence decreased along the flowering order. The disease mainly distributed below the 7-layer fruiting branch, and the closer the cotton boll was to the ground, the more incidence high. Cotton boll maturity and temperature determines the distribution of anthracnose, the above two factors plus cotton boll height, determines the distribution of the epidemic. Early June to early July, the early transplanting of cotton artificial or chemical removal of the base part of the first three fruit branches on the early buds can raise the flowering and boll opening parts of cotton, bolls and optimize the pattern to improve cotton yield and quality control of rotten bell Up to 25.5% ~ 68.98%.