Study on “the Three Reds and Three Blacks” Phenomenon of White Wax Scales in the Production of Its Brood Insects

There has existed “the three reds and three blacks” phenomenon in white wax scales brood insects production for hundreds of years,which brought about an up-and-down of white wax production.After an investigation over 20 years,the authors considered that the reasons were not the results of dry hot wind,drizzle,frog,unreasonable use of host tree,but the result of enemy insect harm-mainly the parasitic wasps’ growth and decline.5 families about 14 species of parasitic wasps of white wax scale can be parasitized in female and male white wax insect.At the peak period of destruction between September and October,a lot of female insects die and become black.When the harm is not serious,brood insects are red and the farmer can get a good harvest.