88 REPORT OF THE FOREST COMMISSION. 



replace. The ravages of the beetle and its larvae may be 

 absolutely prevented by spraying the trees soon after the leaves 

 unfold with a solution of arsenate of lead. The effect of tnis 

 treatment can be seen almost anywhere in the northern part of 

 the State, where sprayed trees in perfect health stand side by 

 side with dead or dying trees which have not been sprayed. 

 The insect attacks elm trees only. Specific instructions for 

 spraying will be given by the Forest Commission, or by the State 

 Entomologist, though tree owners are recommended to turn first 

 to their local shade tree commission, or if one is not organized 

 to get it established. Through such concerted action as a shade 

 tree commission offers the spraying O'f the trees, and every other 

 thing needful for the welfare of ornamental trees, can be best 

 and most cheaply accomplished. The cost of spraying a single 

 large elm may be anywhere from, $5 to $20. If the owners of 

 fifty or more trees unite the cost may be $2 or less. 



BROWN-TAIL MOTH AND GYPSY MOTH. 



The danger that threatens from these two insects 'is made evi- 

 dent on pp. 85 and 86. Neither has yet objtained a foothold in 

 New Jersey, and the State Entomologist believes that his inspec- 

 tions will serve to keep them from establishing themselves unless 

 the influx of infested plant material from abroad shall become 

 too great. A strict National and State quarantine is our only 

 safeguard. A reference to the bills that New England is now 

 paying will justify any reasonable expenditure. 



WHITE PINE BUSTER RUST. 



One case of this most dangerous disease (see p. 85) was 

 discovered last spring in a plantation made in 1909. Fortunately 

 the owners recognized the danger and promptly pulled up and 

 burned the whole 10,000 trees, those that were still apparently 

 clean as well as those that were diseased. This source of infec- 

 tion is therefore removed, but constant watchfulness will be 

 necessary, as many young white pines are being planted in this 



