论文部分内容阅读
1981年以来,福建省许多地区在水土流失区大面积种植杨梅(Myrica rubra)。但1987年以后,泉州、漳州、宁德、建阳、三明等地区相继发生一种黄叶病,症状表现为:地上部叶片黄化、脱落、梢枯,最后整株枯死;地下部的侧根和须根发现有大小不一的根结,小如米粒,大如核桃,呈圆形,或椭圆形,或串珠形。发病后期根结发黑腐烂,腐生菌大量繁殖,根系溃烂。剖开根结可见乳白色囊状雌虫及棕色卵囊。1992年,南安县水土保持试验站和南安县植保植检站等单位对南安县七个点进行重点调查,地上部梢枯明显的达81.8％,病情指数为36.7％;根结发生率平均为61.0％,根结指数为37.0,两者呈极显著相关[R=0.3987>r_(0.01)(238)]。初步鉴定该病是由根结线虫(Meloidogyne spp.)等引起的侵染性病害。对该病的研究及防治工作还在进行中。
Since 1981, Myrica rubra has been planted extensively in many areas of Fujian Province in soil erosion areas. However, after 1987, a yellow leaf disease occurred one after another in Quanzhou, Zhangzhou, Ningde, Jianyang, Sanming and other areas. The symptoms were as follows: the aboveground leaves were yellowed, shedding and withered, and finally the whole plant died; Stems of different sizes are found in the root knot, as small as rice, as large as walnut, was round, or oval, or beaded. After the onset of black rot roots, saprophytes multiply, root ulceration. Cut open the root knot visible milk white cystic females and brown oocysts. In 1992, Nan’an County Soil and Water Conservation Experimental Station and Nan’an Plant Protection and Phytosanitary Station carried out a key survey of seven spots in Nanan County. The shoots on the ground were significantly up to 81.8% and the disease index was 36.7%. The average incidence of root knot was 61.0% and the root knot index was 37.0. There was a significant correlation between them (R = 0.3987> r 0.01 (238)]. Preliminary identification of the disease is caused by the root-knot nematode (Meloidogyne spp.) And other infectious diseases. The disease research and prevention work is still underway.