A Study on the Climatic Adaptibility of the Lac Insect, Kerria sindica (Mahdihassan)

A study has been made on the climatic adaptibility of the introduced lac insect Kerria sindica (Mahdihassan) in China.It has been proved through pilot experiments of a term of 10 years that the optimum breeding areas of the insect are those of the annual average temperature over 23℃ where it can complete 2 generations in a year with regular life cycle,rich secretion of lac and high ability of reproduction and adaptability.It has also been established systematically that the breeding areas of the insect in China have the following temperatural features:(1) annual average temperature:22℃;(2) average temperature of the coldest month in a year:14℃;(3) the lowest temperature:5℃ (temperature decresing owing to cold current) or 1℃ (temperature decresing owing to radiation).