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一、为害情况调查 1979年冬,马尾松球蚜在我县南山林场的7—8年生马尾松幼林内大量发生,为害情况调查记载如表1。
First, the investigation of the damage In 1979 winter, Masson pine aphid occurred in a large number of 7-8 years old masson pine forest in Nanshan Forest Farm in our county, the investigation of the damage situation is shown in Table 1.