樟子松梢斑螟发生规律及防治技术

为了有效防治樟子松梢斑螟(Dioryctria mongolicella)的危害,分析了樟子松梢斑螟与树种、树龄、林龄、树木在林分中位置、林种、林分密度及郁闭度等林分因子的关系。结果表明:该虫喜光照充足、温暖的环境;在林缘南侧被害株率和受害程度一般重于林缘北侧,东西两侧的林缘受害程度次之;密度小的林分被害株率和受害程度一般高于密度大的林分,郁闭度高的林分受害程度明显较轻;单虫坑道的平均营养面积为7.87 cm²;防治试验发现,应用质量分数22.5%的敌敌畏油剂原液点涂凝脂团后梢斑螟幼虫死亡率达100%;采用氧化乐果、吡虫啉、氯氰菊酯等药剂和“柔脂通”或“激健”等渗透助剂以一定比例混合后涂抹凝脂团,杀虫率多为35%~70%,最高可达84%。同种稀释倍数且加入相同剂量渗透剂后,氧化乐果的防治效果显著高于吡虫啉和氯氰菊酯;采用氧化乐果、阿维菌素、氟氯氰菊酯、吡虫啉、啶虫脒、氯胺磷等药剂进行树干打孔注药,均无防治效果。

Occurrence Regularity and Control Technology of Dioryctria mongolica Wang et Sung

In order to effectively controlling Pinus sylvestris var.mongolica harm from Dioryctria mongolicella,by investigating the relationship between the D.mongolica and host tree species,tree-age,stand age,position of trees in the stand,forest category,stand density and canopy density,the pest preferred a warm and sunny environment.The attacked trees rate and degree of damage in the south side of the forest edge were generally heavier than those in the north side of the forest edge,followed by the damage degree of the forest edge on the east and west sides.The attacked trees rate and damage degree of the lower density stands were usually larger than that of higher density stands.The damage degree of stand with high canopy was usually lighter.The results showed that the average trophic area of single larva was 7.87 cm².The mortality rate of larvae was 100% after spreading 22.5%dichlorvos oil miscible liquid on the resin condensation package formed by larvae damage.The killing rate was 35%-70%,and the highest was more than 84%.After spreading omethoate,imidacloprid,cypermethrin mixed with some dosage of auxiliary penetrant such as“Rouzhitong”or“Jijian”.The control effect of omethoate was significantly higher than that of imidacloprid and cypermethrin when they were under the same dilution ratio and added the same penetration agent.However,it is not effective,by drilling holes on the trunk and injecting omethoate,avermectin,fluralinate,imidacloprid,acetamiprid,and chloramine phosphorus.