The Mosquitoes of New Jersey 171 



5. Balance when all bills are paid. 



6. Balance of appropriation not yet in hand. 



The controlling agency should scrutinize carefully the expendi- 

 tures of the preceding unit-period in comparison with the budget esti- 

 mates for that period. 



Temporary Work 



The purpose of temporary work is to afford immediate protection 

 to the population of the protected area. This involves a knowledge 

 of the breeding in all temporary breeding places as well as in the 

 permanent ones before the larvae have a chance to transform to 

 adult mosquitoes and, indeed, in time to permit the completion of 

 temporary treatment before emergence can take place. 



When salt marsh, woodland-pool or fresh-water swamp species 

 are to be met, this knowledge should be in hand not later than the 

 middle of April in New Jersey, for between that time and emergence 

 there is usually a period of a little over two weeks and rainy weather 

 may interfere with the application of control measures. 



Up to May first the number of men engaged in the finding of 

 breeding may be small because the period during which they have to 

 cover the area is long. But after that date the force should be 

 sufficient to cover the entire upland area thoroughly once every 

 two weeks and the salt-marsh once every week. Salt-marsh in- 

 spection needs will vary tremendously with the weather and it is 

 practicable to reduce the amount of inspection given to it under dry 

 weather conditions far below the point to which upland inspection 

 can be reduced under similar weather conditions. This is true be- 

 cause the salt marsh is open and easily seen while the upland is more 

 or less wooded and covered with homes and other buildings. As a 

 rule, the New Jersey inspection practice now operating falls consid- 

 erably below this requirement and the mosquito trouble to which 

 some of the protected areas are subject is largely traceable to this 

 fault in operation. 



In areas where neither salt marsh, fresh-water swamp, nor wood- 

 land-pool species are found inspection may be delayed until May i 

 or possibly even until May 15. 



When breeding is found it should be destroyed by filling to grade, 

 draining, stocking with fish (which must almost invariably be ac- 

 companied by cleaning and sharp edging), or treating with larvicide 

 or covering with oil. 



