250 Forestry Quarterly. 



money that any owner can afford to expend in preventing injury 

 to his woodlands." 



"Experiments have shown that coniferous trees are not injured 

 by the gipsy moth if grown in isolated pure stands, and if the 

 growth is such that the trees can be thinned to a stand of coni- 

 fers no hand suppressive measures are necessary in order to pre- 

 vent injury by this insect. (See fig. 10.) Such lots will also be 

 immune from attack by the brown-tail moth, as the larvae of this 

 insect do not feed on conifers. 



"If mixtures containing a large percentage of deciduous trees 

 are to be protected from moth injury, it is very necessary that the 

 species involved should be carefully considered before a decision 

 is reached as to the best methods of treatment. Sometimes prac- 

 tical methods of thinning can be adopted so that species will be 

 left that are only slightly subject to injury by these insects. A 

 limited number 01 experiments have shown that mixtures of 

 chestnut, pine, red maple, ash, and hickory, regardless of the pro- 

 portion of each species, are seldom injured by the gipsy moth. 



"In woodlands the oaks are the most favored food plant of 

 this insect, and unfortunately the infested region abounds in large 

 areas where these species predominate. At present there seems 

 to be no means aside from hand treatment which will prevent 

 serious injury to oak woodland. . . . 



"This problem is being given special study and consideration 

 in the hope that some economical method may be devised for pro- 

 tecting and improving wood lots of this character at moderate 

 expense. . . . 



"The damage caused by the brown-tail moth is ordinarily not 

 so severe as is that resulting from gipsy-moth infestation because 

 the former species does not have so wide a range of food plants 

 and, further, because the bulk of the feeding is done early in the 

 season so that the trees have an opportunity to recover before 

 midsummer. In the territory where both insects exist the cater- 

 pillars of the gipsy moth supplement the work which is done by 

 those of the brown-tail moth and the injury^ is therefore greatly 

 increased. The large acreas of oak-sprout growth furnish abun- 

 dant food for brown-tail moth caterpillars. . . . 



"Elimination of oak, scrub apple, and wild-cherry trees would 

 assist greatly in reducing the numbers of this pest." 



At the present time both the New England States and the 



