Nineteenth Report, State Entomologist of Minnesota to the Governor (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Nineteenth Report, State Entomologist of Minnesota to the Governor

In August and early September of 1922, the birch skeletonizer destroyed the leaves in practically all the birch woods in the northern part of the state. This defoliation came after the trees had completed the season's growth and did comparatively little permanent injury. In some cases, however, owing to the early loss of leaves and the late fall, the buds of the birches began to swell before cold weather set in. This will probably mean a considerable amount of winter injury. The larvae of this insect were so abundant that there was not sufficient green foliage to carry them all to maturity. A very large proportion of the caterpillars starved to death and many others spun cocoons in an under-nourished condition. As a result it is probable that the skeletonizer will not be very abundant in 1923.

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