14 BULLEXIX 1080, v. S. DEPARTMENT OF AGRICULTUEE. 



Island, the southern and eastern parts of Massachusetts, and the 

 coastal section of New 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 practically all eggs hatch. 



The benefit derived from nonhatch is offset to some extent by the 

 injur}^ cold weather works upon the parasites of the moth. 



As temperature is entirely uncontrollable, there is no way that man 

 may 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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