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棉花根结线虫病在我国未见详细报道.1982年5月～1984年12月,作者对浙江金华地区发生的棉根结线虫病作了调查,并在大田和温室进行了该病原的生物学研究。调查表明,该病主要分布于金衢盆地的金华、兰溪、江山、龙游、开化、衢州等6县、市的部分棉田.此外,浙江省萧山棉区也有少量发现。根结线虫主要侵害棉花幼苗根系,同时还危害棉田多种杂草和其他作物.病原线虫经鉴定为南方根结线虫(meloidogyne incognita);鉴别寄主试验结果,确认为该种的4号生理小种.在金华地区,此虫一年发生五代,主要危害期在4月中旬～10月中、下旬.在自然条件下,每代历期25～30天,影响历期的主要因素是温度.在粗砂型土壤中,线虫幼虫的密度较大.
Cotton root-knot nematode disease has not been reported in detail in our country.From May 1982 to December 1984, the authors investigated the occurrence of cotton root-knot nematode in Jinhua, Zhejiang Province and carried out the biology of the pathogen in fields and greenhouses the study. Survey shows that the disease is mainly distributed in Jinhua, Lanxi, Jiangshan, Longyou, Kaihua, Quzhou and other 6 counties and cities in the Jinqu Basin. In addition, a small amount was found in Xiaoshan cotton area of Zhejiang Province. Root-knot nematodes mainly infest the root system of cotton seedlings, but also endangered the weeds and other crops in the cotton field.The pathogen nematodes were identified as meloidogyne incognita, and the host test results were identified to identify the species 4 In Jinhua, the pest occurs in five generations a year, with the main harms being in mid-April to mid-to-late October. Under natural conditions, each generation has a duration of 25-30 days, and the main factor affecting the duration is temperature. Coarse sand soil, nematode larva density.