36 N. J. Mosquito Exte:rmination Association 



vince public sentiment that its cooperation is necessary to the 

 extent that people will cease to aid in creating artificial mosquito- 

 breeding places, and to lend their assistance and cooperation in 

 the elimination of the natural mosquito-breeding places, then 

 mosquito extermination will have reached a point where the work 

 will have some degree of success. 



Discovery of the cause and control of mosquito-breeding places 

 is a tremendous task, but the task of securing successful public 

 assistance is almost of equal difficulty. 



Purification of rivers and streams, after years of gross pollu- 

 tion, will not be a simple matter. Any effort on the part of the 

 public to bring back natural conditions to many of the grossly- 

 polluted rivers and streams is liable to be very disappointing, 

 owing to the fact that it can be accomplished only at a cost which 

 the public would refuse to pay. Temporary relief from unsani- 

 tary conditions caused by sewage and industrial wastes dis- 

 charged into rivers and streams, no doubt, will be attempted as 

 a health measure where conditions require it or public sentiment 

 compels a change in these conditions, and where this takes place 

 mosquito-extermination work will be benefited to some extent. 

 In large areas of water polluted with sewage or mill wastes it 

 is almost impossible, on account of the cost, for the mosquito 

 extermination commission to attempt to change the situation in 

 the interest of mosquito work. 



Leading to the present unsatisfactory conditions in our most 

 valuable streams, one of the perplexing problems confronting the 

 mosquito extermination commissions of some counties is the con- 

 trol of stream pollution. Not the least important of the many 

 serious problems connected with mosquito-control work is the 

 extensive breeding caused by the discharge of sewage and manu- 

 facturing wastes into ponds, pools and streams. Frequently the 

 natural enemies will be absent, either accidentally or through 

 artificial conditions, such as the discharging into pools of ma- 

 terials that are fatal to them. But not so to the mosquito larvae. 

 Under such circumstances the whole pool speedily becomes a 

 breeding place, and the presence of a greatly increased number 

 of mosquitoes in the territory is soon evident. The latter is a 



