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为有效防治云斑白条天牛(Batocera lineolata)对核桃的危害,在前人对其在不同树龄、树高、胸径树干上产卵刻槽分布的研究基础上,进一步研究云斑白条天牛幼虫排粪习性及成虫刻槽分布与海拔、地径、树干周长的关系。结果表明:孵化后的幼虫先在韧皮部、后在木质部取食危害并形成蛀道,蛀道方向朝上,排粪孔朝下,各蛀道前期不相通,后期相通;幼虫排粪高峰集中在17:00—19:00;核桃受害程度随海拔增高而降低,在海拔1 450~1 600 m范围内,受害株率50.0%~74.3%;云斑白条天牛喜在胸径5~15 cm、地径10~20 cm、周长30~50 cm的核桃树干上产卵为害,5年生树集中在树干高度100 cm以下,10年生树集中在树干高度200 cm以上。建议避开幼虫排粪高峰施药,并在5年生幼树期开始防治,避免刻槽随树龄增加而上移,从而增加防治难度。
In order to effectively control the damage of Walnut by Batocera lineolata, based on the previous studies on the distribution of spawning grooves on tree trunks of different ages, tree heights and DBHs, Defecation habits and groove distribution of adult and its relationship with altitude, diameter and trunk circumference. The results showed that larvae hatched first in the phloem, then fed on the xylem and endangered and formed tunnels with the direction of the tunnel facing upwards and the fecal hole facing downwards. The larvae did not communicate with each other at the early stage, 17: 00-19: 00. The damage degree of walnut decreased with the elevation increasing. The rate of damaged plants was 50.0% ~ 74.3% in the range of 1 450 ~ 1 600 m above sea level. At the diameter of 5 ~ 15 cm, The 5-year-old trees were concentrated in the height of trunk less than 100 cm, and the 10-year-old trees were concentrated in the trunk height of more than 200 cm. It is recommended to avoid larvae peak application of pesticides, and 5-year-old sapling start prevention and control to avoid the groove with the increase of age and increase, thereby increasing the degree of prevention and treatment.