六星吉丁虫在柑桔上的发生规律及其防治

通过对危害柑桔的吉丁虫进行发生规律和防治对策的研究，结果表明：在街州柑桔上为害的吉丁虫与山杜英上为害的吉丁虫为同一种。该虫在衙州1a发生1～2代，以老熟幼虫侵入木质部筑蛹室休眠越冬或以低龄幼虫在韧皮部越冬。木质部休眠越冬幼虫4月底至5月化蛹，1代成虫主要集中在6月上旬至中旬，是主高峰；8月底、9月出现2代成虫，是次高峰。7月是1代幼虫为害高峰，9月后多有生活史重叠。该虫危害柑桔枝干，蛀食其韧皮部，初为害时部分枝干会出现流胶，后期造成树皮爆裂，皮层缺损或枝枯。提出了采取营林措施、检疫措施、人工、生物、化学防治等防治措施。

Occurrence Rhythm and Control of Chrysobothris igai at Orange Stand

Study on occurrence rhythm and control of Chrysobothris igai at orange stand in Quzhou, Zhejiang province indicated that the insect was the same species damaged to Elaeocarpus decipiens, 1-2 generation a year, overwintered in xylem by adult or phloem by larva. Pupation of overwintered in xylem occurred in April and May, the first generation adult in June and the second generation in August and September. Damage of the first generation topped in July, and in September overlapping history cycle. C.igai damages to branch of orange by phloem. Control methods were offered such as silviculture, quarantine, biological and chemical control.