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油茶受到綿介壳虫为害后,又往往引起煤病为害,严重的影响油茶产量,甚至造成整片的油茶林死亡。目前对油茶綿介壳虫防治方法很多,但最經济最彻底的方法是利用天敌——赤星瓢虫。1960年5月初,我們在青田樟村公社黄山头調查,有150多亩油茶林(大部是1959年发生綿介壳虫和煤病的)密布着綿介壳虫的卵块,每20厘米长的枝条上平均有6-7个卵块(每个卵块500-800粒卵),如果用石灰硫磺合剂防治,要化600多元,150多个劳动力,并且不能彻底。但由于1960年大量繁殖赤星瓢虫,不到一个月的时間,150多亩密布綿介壳虫卵块的油茶林,99％的卵块被赤星瓢虫吃掉。所以,利用赤星瓢虫是防治綿介壳虫和煤病的重要途径。
Camellia insects destroyed by insects, they often cause coal damage, a serious impact on the yield of tea, or even cause the entire piece of Camellia death. At present, there are many ways to prevent and cure Camellia esculenta, but the most economical and thorough way is to use natural enemies, ladybird ladybird. At the beginning of May 1960, we surveyed Huangshantou in Zhangcun Commune, Qingtian. There are over 150mu oil-tea forests (most of which are scabies and coal-borne diseases in 1959) On an average of 6-7 eggs (500-800 eggs per egg), if lime sulfur mixture control, to 600 yuan, more than 150 labor, and can not be completely. However, due to the large population of ladybugs in 2009, less than a month, more than 150 acres of Camellia oleifera larvae, 99% of the egg masses were eaten by the ladybug. Therefore, the use of ladybird ladybug is an important way to control Smectite and coal disease.