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通过田间调查发现,5年生欧美107杨杨树溃疡病防治指标为1.5m以下40个病斑;6年生欧美107杨杨树溃疡病防治指标为1.5m以下60个病斑。
Field investigation found that 5-year-old Europe and the United States 107 poplar canker disease prevention and control indicators for less than 1.5m 40 lesions; 6-year-old Europe and the United States 107 poplar canker disease control indicators for less than 1.5m 60 lesions.