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杨干象虫是杨树的毁灭性害虫,严重为害3年生以上的幼树,近年来在东北已蔓延成灾。在东北只为害杨柳科植物,其中以中东杨和加拿大杨被害最重,但小青杨×加拿大杨的杂种场有强度抗性作用,可供选择树种参考。杨干象虫在辽宁一年一代,以初龄幼虫、卵和成虫越冬。成虫在无风和高湿高温条件下可以飞行。将卵产于寄主的木栓层内.每头雌虫平均产卵44粒,产卵期平均36.5日。卵期2—3周,蛹期平均10日。成虫寿命较长,雄虫平均63日,雌虫平均85.5日。 应用白僵菌防治幼虫试验表明,往杨干象虫幼虫坑道口喷射每毫升含孢子18—20亿或9—10亿的白僵菌液,均可收到良好的防治效果。
Yang dry elephants are poplar devastating pests, severely damaged saplings over 3 years old, in recent years has spread in the northeast disaster. In the northeast only to damage willow families plants, of which the poplar and Canada poplar Chongyang the most important, but Xiaoqing Yang × Canadian poplar field hybrids have an intensity resistance role, for the selection of species reference. Yang dry elephants in Liaoning a generation, to the first instar larvae, eggs and adults wintering. Adult fly in the absence of wind and humidity conditions. The eggs produced in the host of the cork stratum.Each females an average of 44 eggs, spawning period average of 36.5 days. Eggs 2-3 weeks, pupal average 10 days. Adults live longer, the average male 63 days, the average female 85.5 days. Application of Beauveria bassiana control larvae tests showed that the dry larvae of dry trunk larvae jet injection per ml of spore containing 1.8 billion 2.0-9.0 billion or Beauveria bassiana liquid can receive good control effect.