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利用杨树梢头制做安装整株树防鸟围网,适宜定量调查鸟类对杨树害虫的捕食作用。该法就地取材,简便易行,每个围网约184元。
The use of poplar tiptoe installation of the whole tree bird fence, suitable for quantitative investigation of bird prey on poplar pests. The law on the ground, easy, each fence about 184 yuan.