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利用澳洲瓢虫防治吹绵蚧,在国外已有70多年的历史,防治效果显著,我国引入澳洲瓢虫后,在防治上亦取得很好的效果。据我们室内饲养结果,一年发生8代,完成一世代的历期19—229天,平均56.26天。每雌虫产卵5—612粒,平均产卵173.82粒,卵孵化率为30.55—99.42％。过冬的成虫于3月上旬大量产卵,3月中旬出现产卵高峰,第一代成虫于4月下旬出现。澳洲瓢虫在重庆地区防治吹绵蚧的有效期为3—11月。成虫抗药力最强,卵次之,幼虫最差。在生物防治区,当澳洲瓢虫与吹绵蚧的虫口比例为1:15左右时,经14—20天后,吹绵蚧便被消灭。从放虫的日期起,约经55—69天,可将全国内的吹绵蚧消灭。
The use of ladybugs in Australia to control blowing cottonseed Kuwaitis has been in foreign countries for more than 70 years. The prevention and treatment effect is remarkable. After the introduction of ladybugs in Australia, the control also achieved good results. According to our indoor rearing results, eight generations occur a year, completing 19-229 days of a generation with an average of 56.26 days. There were 5-612 eggs per female, with an average of 173.82 eggs and an egg hatching rate of 30.55-99.42%. The overwintering adults spawn in large numbers in early March, while the spawning peak appears in mid-March. The first generation of adults appeared in late April. Ladybug Australia in the prevention and control of blowing cotton Kuwana is valid from March to November. Adults resistant to strongest, eggs times, larvae the worst. In the biological control area, when the ratio of ladybugs to poplar in Australia is about 1:15, after 14-20 days, cotton bollworm is eliminated. From the date of the release of insects, about 55-69 days, the blowing of cotton wool within the country can be eliminated.