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柳杉长卷蛾是一种猖獗性的柳杉食叶害虫。在福建一年发生二代,以2～3龄幼虫在被害的针叶内越冬。幼虫共6龄,2龄前幼虫在针叶内取食叶肉,为害状似叶部病害,3龄后钻出叶外吐丝缀叶形成虫苞,取食针叶和嫩枝皮。为害期长达230多天,一年有4月中、下旬,8月上旬二个为害烈期。化学防治该虫关键要抓住越冬代3～4龄幼虫,选用2.5%澳氰菊酯乳油,或50%甲胺磷,或90%敌百虫晶体弥雾防治,效果可达90%以上。
Cryptomeria crassipes is a rampant Cryptomeria fortunei insects. In Fujian second generation occurs a year, 2 to 3 instar larvae wintering in the victim’s needles. A total of 6 larvae of larvae, 2 instar larvae feed on the leaf in the leaves, the damage like leaves disease, after 3 years of age out of leaves outside the leaves of sprouting leaves form insects, feeding needles and twigs. Damage period of up to 230 days, a year in mid-April, late August, early August two damaging period. Chemical control of the insect to capture the 3rd to 4th instar larvae overwintering generation, the choice of 2.5% of fenpropathrin EC, or 50% methamidophos, or 90% trichlorfon crystal Mist prevention and treatment, the effect of up to 90%.