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大灰象虫是福建省柑桔类果树的重要害虫之一,此虫在福州、閩侯地区,一年发生一代,少数二年完成一代。以成虫及幼虫在土中越冬。越冬成虫于3月底开始出土活动,取食新梢嫩叶及幼果。4月中旬为发生盛期并开始产卵,产卵期长达69—111天。卵期在4—6月間为7—12天,7—8月間为5—6天。4月下旬幼虫开始孵化,7月中旬以前孵出的幼虫,当年10月底开始羽化,羽化成虫在蛹室中越冬,翌年春暖出土;7月下旬以后孵出的幼虫,当年职幼虫在土室内越冬,幼虫期长372—400天,直到第二年9—10月間才化蛹、羽化,并以成虫越冬,第三年春暖出土。成虫食性复杂,不同食料植物对其寿命、产卵量、产卵期有很大影响。生活在桃树上成虫寿命最长,产卵数量也最多。防治方法,采取胶环捕杀或人工震落捕杀成虫收效很大。药剂方面,可噴射50％敌百虫400倍液或6％可湿性六六六及25％DDT乳剂混合液(1:1:200)效果甚好。
Large gray elephant insects, citrus fruit trees in Fujian Province is one of the important pests, the insects in Fuzhou, Minhou area, a generation a year, a few years to complete a generation. To adult and larvae overwintering in the soil. Overwintering adults began unearthed in late March, feeding young shoots and young fruit. In mid-April for the peak and began spawning, spawning period of 69-111 days. The egg period is 7-12 days in April-June and 5-6 days in July-August. In late April, the larvae begin to hatch. The larvae hatched before mid-July begin to emerge at the end of October of the same year. The feathered adults winter in the pupal chamber and are excavated in spring and spring the following year. The larvae hatched in late July, , Larvae period 372-400 days, until the second year from September to October pupation, eclosion, and adult wintering, the third year spring unearthed. Adult feeding complexity, different food plants have a great impact on their longevity, fecundity, spawning period. Adults living in peaches longest life expectancy, the largest number of eggs. Prevention methods, plastic ring to kill or kill artificial kill great success. Pharmacy, the injection of 50% trichlorfon 400 times or 6% WP six six six and 25% DDT emulsion mixture (1: 1: 200) works very well.