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落叶松毛虫Dendrolimus superatls(Butler)越冬幼虫在地面上主要分布在距树干1米的圆区内;在树干周围直径为1米的圆区内,选择西侧1/4扇形区内的虫口数(x)来估计全株虫口密度(y),准确率可达92.30％以上。其数学模型为y=1.2075+3.9122X。
Dendrolimus superatls (Butler) Overwintering larvae are mainly distributed on the ground in a circular area 1m away from the trunk; in the circular area 1m in diameter around the trunk, the number of insects in the 1/4 sector on the west side x) to estimate the whole plant population density (y), the accuracy rate of up to 92.30%. Its mathematical model is y = 1.2075 + 3.9122X.