赤松梢斑螟Dioryctria sylvestrella Ratzeburg为危害红松幼树嫩梢、球果及干部的重要害虫。中国只分布于黑龙江省。1年发生1代,以幼虫在被害后形成的松瘤包内越冬。翌年4月下旬幼虫开始活动,幼虫期长达330天,在韧皮部蛀食为害达110多天,引起主梢枯死,主干分叉。幼虫共5龄,5月下旬老熟化蛹,蛹期15天左右。6月中旬成虫羽化并交尾产卵。新幼虫6月下旬孵化,9月份越冬。栽针保阔,在透光抚育时,保持侧上方蔽荫0.3郁闭度,最后形成针阔混交林。它是避免红松幼树遭到害虫攻击的最好途径。化防以选择内吸剂并采取根部打孔注药为好。
DiorycLria sylveslella is an important insect of Korean pine. It damages cone、stem and new shoot. It distributes only in Heilongjiang province.
There is one generation a year in Heilongjiang province. The Larvae are borers and overwinter in the galls of pine. They begin to move in the last ten days of April. Duration of Larva is 330 days. Larva damages phloem and causes death of trunk. Harmful period of larva is more than 110 days. Larva stage has 5 instars. Larvae pupate in she last ten days of May. Duration of pupa is 15 days. The adalts emerge in the middle ten days of June, then mate and oviposit. New larvae incubate in the last ten days of June and overwinter in september.
Control measures: 1. Culturing conifer and reserving broadleaved trees and forming the mixed forest, which is the best way that avoids the trees to be infested by the insect; 2. Systemic insect ieide is poured into holes that are around roots.
Forestry Science & Technology