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采穗圃杨树母株极易发生黄叶病,致使植株停滞生长,渐渐死亡,严重制约苗木生产。1、成因由于采穗圃连年大量采集插穗或杨树重茬连作,再加上长
Spruce poplar mother plant extremely susceptible to yellow leaf disease, resulting in stagnant growth of plants, gradually death, seriously restricting the production of seedlings. 1, the reason As a result of mining sprouts year after year a large number of harvest cuttings or continuous cropping of poplar, plus long