It is discussed the occurrence and harmfulness of valsa sordida of poplar in 4 aspects.
2
结合水肥管理，加强树木的养护与化学防治相结合，以测报和防治指标为依据是杨树烂皮病综合治理重要手段。
So we should on the basis of prediction and index, considering the fertilization, trying to conserve the trees and doing some chemical cure, implement integrative management.
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