Was a stimulus, the conifer twig blight and pine spittlebugs were activation factors.
治理应坚持生物措施为主、化学防治措施为辅的原则,并逐步将樟子松纯林改造成混交林。
f twig blight:枝烧病;枝炫
小枝 twig | 枝烧病;枝炫f twig blight | 双生子;孪生;双胎 twin