Proceedings of Sixth Annual Meeting . 2V 



During 1918, our night collections showed that the salt marsh 

 species were sixty-seven per cent of our mosquito annoyance. The 

 continuous broods of Aedes cantator that invaded our territory 

 from May to September of 1918, ruined the effects of our local 

 work, and put us beyond the paJe of public commendation and 

 thereby lessened their faith in mosquito extermination work. We 

 have not yet reached the point where the public has sufficient 

 knowledge of mosquito work that they can distinguish between 

 mosquito annoyance caused by either the salt marsh or fresh 

 water species. 



One of the great essentials back of success in mosquito exter- 

 mination, and the most important one to inland counties, is the 

 prevention of the migration of the salt marsh species. Real con- 

 fidence in the success of mosquito control in inland counties cannot 

 be assured until that is accomplished. 



Particular Difficulties Met and Overcome 



The ordinary problems met in mosquito extermination work in 

 inland counties can usually be solved by applying some method 

 of drainage, filling or spraying with oil, but when a problem in 

 mosquito control work is presented where none of the usual methods 

 can be applied, it is very difficult for one to solve. Such is the 

 problem that confronts us on that part of the Passaic River, north 

 of the Ackermann Avenue Bridge, Clifton to 33rd street, Paterson, 

 a distance of five miles, which is the dividing line between Bergen 

 and Passaic Counties. It consists of over three hundred acres of 

 the most grossly sewage polluted area in the United States. The 

 rich organic life in the raw sewage makes ideal food for mosquito 

 larvae. These conditions furnish the most perfect mosquito breeding 

 ground, and cause breeding to become so intensive at times that the 

 problem of extermination is a very difficult one. 



Up to the present time we have been unable to find a remedy 

 that will give maximum results. Spraying with fuel oil is only 

 fifty per cent effective on account of the oil film moving with the 

 light current. 



Cost of This Year's Work 



In 1918 the Passaic County Commission expended for mosquito 

 control work, fourteen thousand dollars, within a territory of thirty- 



