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湖北江汉平原引种的欧美杨树,桑天牛发生严重。在嘉鱼县有二年一代和三年一代。由于成虫与幼虫的食性不一致,成虫白天集聚在桑、构枝条上取食树皮,晚间飞往杨树上产卵。根据这一特点,于杨树林四周栽植桑、构丛,在成虫羽化期间进行诱捕防治,简单、经济、安全,并可收到良好的防治效果。秋季结合营林措施,修剪虫枝,第二年春季采用药棉签防治遗漏的幼虫,经过3—5年的努力,就能控制它,使损失在经济允许限度以下。特别是可保证6m以内的主干材上没有蛀孔,而每年防治费为0.40— 0.50元/亩。
Hubei Jianghan Plain introduced Europe and the United States poplar, mulberry days serious. In Jiayu County there are two generations and three generations. Due to inconsistent feeding habits of adults and larvae, adults gather in the mulberry leaves during daytime and bark feed on the bark and fly to the poplars at night to lay eggs. According to this feature, mulberry and coniferous trees are planted around the poplar forest. Trapping control during the emergence of adult insects is simple, economical and safe, and good control effects can be obtained. Combining with the measures of forest management in the autumn, it is possible to control the insect larvae by using the cotton swabs to prevent missing larvae in the spring of next year. After 3-5 years of hard work, the larva can be controlled so that the loss is below the economic allowable limit. In particular, it can guarantee that there is no wormhole on the trunk material within 6m, and the annual prevention and control fee is 0.40- 0.50 yuan / mu.