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白根病菌(Fomes lignosus)侵害胶树的途径是用它的菌丝体或根状菌索定殖在胶树地下根系的表面,再由菌丝侵入下面的组织。1930年爪哇提倡检查根系和讓其暴露的措施,由此认识到此菌在干燥情况下不能生长。此法的缺点是:在某些土壤上,至少植株的固定力被削弱了,从而以后有被风吹倒的危险。继而发现用物理方法防止白根病菌丝在树根表面蔓延(在一个观察坑每周将树根表面生出的菌丝括掉),也能防止树根内部腐烂的扩大。1958年,当我们寻找一种土壤消毒剂已告失败的时候,发现了这种情况,这使我们更细致地检验用一种合有五氯硝基苯(PCNB 或
Pathogen of Fomes lignosus against gum trees is the use of its mycelium or root-like colonization in the gum root surface of the underground system, and then invaded mycelium below the organization. In 1930, Java encouraged measures to check the root system and let it be exposed, thereby recognizing that it could not grow in dry conditions. The disadvantage of this method is that in some soils at least the fixing force of the plants is weakened and the danger of being blown down later on. It was then discovered that the physical approach to prevent the mycorrhizal fungus from spreading on the surface of the tree root (encircling the mycelium on the surface of the tree root weekly in a single observation pit) also prevented the decay of roots within the roots. This was discovered when we searched for a soil disinfectant in 1958, failing which led us to examine in more detail the use of a combination of pentachloronitrobenzene (PCNB or