14 BULLETIX 1080, V. S. DEPARTMEXT OF AGPJCULTUEE. 
Island, the southern and eastern parts of Massachusetts, and the 
coastal section of Xew Hampshire derive very little, if any, benefit, 
for even after the coldest winters nearly all eggs hatch. 
Xonhatch is of a periodic nature, as occasionally Xew England is 
visited by a mild winter, after which ])i^ctically all eggs hatch. 
The benefit derived from nonhatch is offset to some extent by the 
injury cold weather works upon the parasites of the moth. 
. As temperature is entirely uncontrollable, there is no way that man 
ma}' direct its action against the gipsy moth. 
Finally, too much reliance must not be placed on nonhatch as a 
means of control, for it occurs only after the egg clusters have been 
exposed to the proper degree of cold. 
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