CONTROL OF GIPSY MOTH BY POTEST MANAGEMENT. 



45 



Stand and cutting table, North Berwick, Me. Northern hardwoods stand with no 



white oak. 





Original stand. 



Number 

 per acre 

 left after 

 cutting 

 described 

 on p. 44. 



Trees which control if in sufficient numbers. 1 



Trees which 



control on 



this lot. 



Other species 

 present. 



Number 

 per 

 acre. 



Class I: 





Red oak 



7 

 2 

 182 

 7 

 5 



. 16 



33 



56 

 11 

 16 



( 2 ) 

 66 



5 



( 2 ) 









Large-tooth aspen. 









77 







Paper birch 



3 







2 



Class II: 



Hemlock 





14 



Class III: 







19 





Sugar maple 





29 





Yellow birch 



Black birch 



Elm 



7 







9 







( 2 ) 



29 









Class IV: 



White ash 







5 





















406 



194 



1 A list of controlling trees for the northern hardwoods region would differ from this one, prepared for 

 the white-pine region. See hornbeam above. 

 2 Less than one tree per acre. 



For effective gipsy-moth control cleanings will be necessary for at 

 least five years (see p. 29) , but the expense may be greatly reduced by 

 confining these to the sprouts of all Class I trees cut, excepting the 

 beech, on which, as already stated, the gipsy moth is not likely to 

 reproduce normally, unless beech is in mixture with other favored 

 species. 



Another method of controlling sprouts is to turn cattle into a lot 

 to pasture. The practice of pasturing cattle in woodlots is followed 

 by some owners wholly apart from any silvicultural considerations. 

 It had been done on the lot now under discussion, with the result 

 that it was almost entirely free of undergrowth of all kinds. Forest- 

 ers condemn the practice, for cattle do not always discriminate be- 

 tween sprouts and seedlings or between valuable and worthless 

 species, and the result is a loss of young growth desirable in any form 

 of management and essential to the success of stands managed under 

 the selection system. In stands containing a very large percentage of 

 trees which are favored food of the gipsy-moth caterpillars, which it 

 is desired to replace by planting, carefully regulated pasturing by 

 cattle or by goats might control the hardwood sprouts, if done for 

 several successive seasons after clear cutting and before planting, 

 but there is danger of exposing the ground so much that it would dry 

 out and entail a large loss among the trees when planted. It is not 

 recommended. If done it should be on a small scale, experimentally. 



