【摘要】 该文报道紫薇毡蚧EriococcuslagerostroemiaeKuwana的种群生物学特性。该虫80年末传入贵州,在贵阳地区每年发生3～4代,世代重叠极重,越冬代是第3、4两代的混合群体,越冬虫态有卵、若虫和蛹。分别估测了卵、雄若虫、蛹、雌若虫和雌成虫的发育起点温度(T0)和有效积温(K)。周年虫口变动有两个高峰:6月中旬至7月上旬和8月上旬至9月上旬。11月至翌年4月,因寄主休眠和低温导致虫口缓慢下降。雌成虫产卵量与寄主生长势好坏有关。控制紫薇毡蚧虫口最有效的天敌是红点唇瓢虫ChilocoruskuwanaeSilverstri。药液涂干并辅之具内吸作用的杀虫药液灌根是目前较好的药剂防治方法。更多还原

【Abstract】 This paper deals with the natural dynamics of Eriococcus lagerostroemiae Kuwana population. This insect pest spread into Guiyang,Guizhou Province,in the late 1980s and occurred 3～4 generations during a year. A mixture of the third and fourth generations overwintered. It could survive the winter in egg,nymph and pupa. The threshold temperature of development ( T 0) was estimated to be -0 3℃ for egg,17 5℃ for male nymph,14 2℃ for pupa,18 8℃ for female nymph and 10 2 ℃ for female adult,with effective temperature summations( K ) of 540 8,88 4,73 0,98 0 and 79 1 day degree,respectively. There were two peaks in population fluctuation each year,which appeared at midde June to early July and early August to early September. The population density gradually decreased from November to early April as the host plant, Largerstroemia indica L.,entered dormant stage and the temperature got lower.The fecundity of the female adult depended on the growth state of the host,the better the tree grew,the more the egg was laid. The lady beetle, Chilocorus kuwanae Silverstri,was the most effective natural enemy controlling the pest. A better chemical control method is to smear pesticide on the tree truck,branches and twigs and watering with systemic insecticide as a supplementary means.更多还原