为了减轻真菌Microcylus ulei引起南美叶疫病造成的损失,首先在南美洲开始了三叶橡胶的树冠芽接试验。众所周知,马来西亚推广的高产无性系大多数易感该病。此外,其中一些无性系也易受风害和感染叶病、绯腐病以及回枯病等病害。为了克服这些缺陷,马来西亚橡胶研究院进行了一系列树冠芽接试验,自1948年开始第一个试验以来,已经得到大量试验资料。 In order to reduce the loss caused by the fungus Microcylus ulei caused by the leaf blight of South America, the clover crown sprouting test was first started in South America. It is well-known that the majority of high-yielding clones promoted in Malaysia are predisposed to the disease. In addition, some of these clones are also susceptible to wind damage and infections such as leaf disease, scrapie and back wilt. In order to overcome these shortcomings, the Malaysian Rubber Institute conducted a series of crown splicing tests, which have yielded a large amount of experimental data since the first test was started in 1948.