米兰叶片上出现灰白点,这是遭糠片介壳虫的侵袭而致。形成的主要原因是:盆栽米兰放置在环境闷热、四周不通风的条件下造成的。防治方法:①米兰在夏秋生长期,应放置在向阳、通风之处,花盆与花盆之间应有一定空隙,这样可减少糠片介壳虫的危害。一旦发现外来植株,要及 Gray spots appear on the leaves of Milan, which is caused by the invasion of bran flakes. The formation of the main reasons are: potted Milan placed in hot and humid environment, surrounded by non-ventilated conditions caused. Prevention and treatment methods: ① Milan in the summer and autumn growing season, should be placed in the sunny, ventilated place, flower pots and pots should have some space between, so as to reduce the damage of flake crusts. Once foreign plants are found, they should be covered