. Bulletin. Agriculture -- New Hampshire. 134 THE BROWN-TAIL MoTII. Observations made during January and February, 1907. showed that where the temperature falls to below 25° below zero Fahrenheit, that large numbers of the caterpillars in the average size nests are killed and that where it drops to -35° Fahr. nearly all may be killed in average size nests, but that those in the large nests on the oaks of 700 to 900 cat- erpillars are not materially i in- jured by these 1 o w tempera- tures. E x p e riments have proven that there is almost no possi- bility of the cat- erpillars being caused to
. Bulletin. Agriculture -- New Hampshire. 134 THE BROWN-TAIL MoTII. Observations made during January and February, 1907. showed that where the temperature falls to below 25° below zero Fahrenheit, that large numbers of the caterpillars in the average size nests are killed and that where it drops to -35° Fahr. nearly all may be killed in average size nests, but that those in the large nests on the oaks of 700 to 900 cat- erpillars are not materially i in- jured by these 1 o w tempera- tures. E x p e riments have proven that there is almost no possi- bility of the cat- erpillars being caused to emerge in midwinter by several unusual- ly warm days such as occurred January 21-23, 1906, at which time the news- papers surmised that the cater- pillars would emerge and be killed by subsequent cold. When they first emerge from the winter nest the young caterpillars are of a blackish color, covered with warm brown or reddish-brown hairs. The head is jet black, while the body is marked with yellow when seen under a lens. Projecting from the back of the fourth and fifth segments is a large tuft of reddish-brown hairs, looking. Fig. 20.—Small Brown-Tail Moth caterpillars emerging from the winter web and feeding on the leaves of its Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New Hampshire Agricultural Experiment Station. [Hanover, N. H. ] : New Hampshire Agricultural Experiment Station
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