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对河南省2005年以来新发生杨树黄叶病害的发生特性进行了研究。结果表明,2008年病害危害继续扩大,新发病地块出现50处,但老的发生区没有大面积扩散,枯死数量所占前年总病树的百分比从2007年的1%下降到了0.6%。黄叶病杨树存在侧芽萌发及顶芽小叶现象,但不属于植物病理学上的丛枝。病害在春秋两季发病明显,实验证明病害与越冬关系不大,7月份有隐症现象,该隐症为高温隐症。加强水肥管理及间伐对缓解症状有一定作用,但是不能彻底治愈,病因可能与苗木的来源有一定关系。病害的发生在立地条件上没有明显规律,养殖小区和菜地内的杨树明显发病较早、较重。未发现明显抗病的杨树品种,法桐等其它近10种树种亦有类似症状。
The occurrence characteristics of poplar yellow leaf disease in Henan Province since 2005 was studied. The results showed that the disease hazards continued to expand in 2008, with 50 newly emerged land plots, but no large-scale spread occurred in the old areas. The percentage of dead trees in total disease trees in previous years dropped from 1% in 2007 to 0.6%. There are lateral bud emergence and top bud leaf phenomenon in the poplar of yellow leaf disease, but not belonging to the phytopathological branches. Diseases in the spring and autumn obvious onset, experiments show that the disease has little to do with winter, there are signs of recessive disease in July, the hidden disease is a high-temperature hidden disease. Strengthening water and fertilizer management and thinning to relieve symptoms have a certain effect, but can not be completely cured, the etiology may have a certain relationship with the source of seedlings. Disease occurred in the site conditions there is no obvious rule, breeding areas and vegetable fields within the obvious onset of poplar, heavier. No obvious disease-resistant poplar varieties, Fatong and other nearly 10 species also have similar symptoms.