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桃象虫在福建闽侯一年发生一代,以成虫和幼虫在土中越冬。越冬成虫于2月间开始出土活动;以幼虫越冬者,其成虫出土约迟两个月左右;4月份为成虫出现的高峰期。成虫于3月下旬开始产卵,4月下旬为产卵盛期,6月上旬为产卵终期。成虫也在6月上旬绝迹。4月上旬果中幼虫始见,6月上旬发生最多。2月至6月是桃象虫一年中主要的为害时期。成虫为害花、叶及果实,以蛀害果实为主,因此引致相当数量的幼果脱落。4月上旬幼果期,成虫盛发之后落果最甚,虫害落果数占总落果数80%。3月下旬至4月中旬连续喷药2—3次除治成虫,对于保果有很大作用。6月上旬为幼虫脱果始期,老熟幼虫从树上蛀果或地面落果中脱出而入土。8月下旬以前大都潜居土下3寸之内,此后逐渐钻入土层深处,部分幼虫当年化蛹并羽化为成虫越冬。故5月下旬检拾落果和摘毁树上虫蛀果,以及在8月中、下旬结合桃树中耕除草,都是消灭幼虫的有效方法。0.1%敌百虫液剂,25%DDT 乳剂200—400倍液,可湿性6%γ666200—300倍液,或25%DDT 乳剂、可湿性6%γ666 1∶1∶400—600倍液,喷射防治成虫,药效达92.7—100%。
Peach-like pests occur in Fujian Minhou a generation a year, with adults and larvae in the soil overwintering. Overwintering adults began unearthed in February; the larvae wintering, the adults unearthed about two months later; April is the peak of adult emergence. Adult worms began to lay eggs in late March, late April is the peak of spawning, and early June is the final spawning period. Adults are also extinct in early June. In early April fruit larvae saw the first occurrence in early June. February to June is peach insects the main period of damage during the year. Adult damage flowers, leaves and fruits, mainly to moss fruit, resulting in a considerable number of young fruit off. In early April, when the young fruit stage is completed, the fruit drop is the worst after the adult vigorous growth, and the number of falling pests is 80% of the total falling fruit number. In late March to mid-April continuous spraying 2-3 times in addition to adult worms, for the protection of fruit has a significant role. In early June, larvae begin their decolouration, and mature larvae emerge from the decaying fruit or the fallen ground fruit. Most of them lived within 3 inches of the earth before the end of August, and then gradually got into the deep soil layer. Some of the larvae became pupae and became adult overwinters. Therefore, it is an effective way to eliminate larvae by picking up fallen fruits and destroying moth-eaten fruit trees in late May and cultivating weeds in combination with peach trees in mid-to-late August. 0.1% trichlorfon liquid, 200-400 times 25% DDT emulsion, 6% γ666200-300 wettable, or 25% DDT emulsion, wettable 6% γ666 1:1:400-600 times, spraying Control adults, the efficacy of up to 92.7-100%.