摘要
1997- 1 999年在三余镇棉田系统调查结果 ,棉花落叶型黄萎病在本区有 2个发病高峰 ,分别出现在 7月中、下旬和 8月下旬或 9月上旬 ,病害发生消长与气温、雨日、雨量及相对湿度密切相关 ,在适宜温度 ( 2 2～ 2 8℃ )范围内雨水多而均匀 ,则发病重。病害危害棉株后 ,对产量的影响主要表现为结铃数减少 ,铃重下降 ,病指与产量呈负相关。
The epidemy of defoliatin strain of verticillium dahliae was investigated during 1997-1999 in a diseased field at the cotton fixed field plots which was planted in Sangyu town,Tongzhou county.The results showed that there are two peaks of disease occurrence from middle to late July and from late August to early September.The spread of disease was closely related to temperature,relative humidity,rainfall and frequency of rain.The peak of diseased appeared after peaks of rainfall or relative humidity at suitable temperature(22-28℃).Cotton yield is decreased by the major reason that the total number of cotton bolls and weight of a single boll are decreased through defoliating strain of verticillirm dahliae.The disease index and the cotton yield is negative correlate.[HJ5:1]
出处
《南京农专学报》
2001年第2期40-44,共5页
Journal of Nanjing Agricultural Technology College
基金
棉花黄萎病(落叶型)防治关键技术与应用基础(BE-96376)
关键词
测定
棉花
落叶型黄萎病
发生规律
损失率
cotton
defoliating strain of verticillium dahliae
regular of disease
yield loss rate
