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莒县陵阳公社于店子大队,去年春在河滩砂土地里造杨树丰产林100亩。削高填洼、加深翻,活土层约1米。栽树时,苗根损毁严重。栽后虽普浇两遍水,但到春末夏初仍处干旱状态。据四月底以前检查,普遍发芽、展叶,树势却很弱。 自五月二日,树杆开始发现小病斑,能挤出褐色粘水,起初以为是机械损伤未愈,未加防治。至五月十日达发病高峰。
Juxian County Yang commune in shop sub brigade, last spring in the beach sand made of poplar rich forest 100 mus. Depression filled depression, deepen turn, live about 1 meter of soil. When planting trees, seedling root damage is serious. Although planted water after pouring twice, but still in early spring and early summer arid state. According to the inspection before the end of April, the general germination, leaf exhibition, the tree is weak. Since May 2, the tree stalk began to detect small lesions that could extrude the brown sticky water. At first thought it was a mechanical injury and healed without any prevention and treatment. Up to the peak on May 10.