论文部分内容阅读
1990～1992年的3～5月间,笔者连续3年在江苏南京、镇江地区,以松材线虫病先年病死木的伐桩、枯枝及健康木上的枯枝作为对象,就其存在的松褐天牛幼虫和松材线虫进行了调查、研究。结果表明,上述材料均可以成为次年病害的侵染来源。越年的枯死木在枯死季节,其主干上未见松褐天牛幼虫,因此,枯死的当年应无传病作用。通过对先年病死木干基剥皮试验,发现树皮下与木质部内有一定数量的松褐天牛幼虫,且虫口数量随着干基高度增加而明显增加。这说明了降低伐桩高度和适时采用剥皮措施,将有利于提高该病的防治效果。
From 1990 to 1992, from March to May, for three years in succession, I studied the existence of diseased wood in the early years of pine wood nematode disease, dead branches and dead branches on healthy wood in Nanjing and Zhenjiang of Jiangsu Province The Monochamus alternatus larvae and pine wood nematode were investigated and studied. The results show that the above materials can become the source of disease in the following year. The more dead wood in the dead season, the trunk did not see Monochamus alternatus larvae, so the year should not be deadly disease-causing effect. According to the pest-dry skin peel test of the previous year, it was found that there was a certain amount of C. septentris larvae in the bark and xylem, and the number of pests increased significantly with the increase of the dry basis. This shows that reducing the pile height and the timely use of skinning measures will help to improve the prevention and treatment of the disease.