218 MOSQUITO ERADICATION 



POINTS THAT REQUIRE FURTHER INVESTIGATION 1 



As stated in an earlier part of this chapter, there are still 

 many points in connection with mosquitoes that require further 

 investigation. These investigations may result in improvements 

 in our present methods of dealing with mosquitoes or in the 

 development of entirely new measures of control. 



Among the points that may be profitably studied, the following 

 may be mentioned: 



1. Hibernation of adult mosquitoes of the various species. 

 What are the natural hibernation places? What relation have 

 shade, shelter, direction of prevailing winds, proximity of stand- 

 ing water, etc., to the hiberation places? Can any method be 

 devised whereby the mosquito may be successfully attacked 

 during the hibernation period? 



2. Survival of larvae over the winter. Can any method of 

 attack be devised that will be of value? 



3. Life of the egg. What conditions of dryness will eggs of 

 the various species and genera withstand? How long will eggs 

 of the various species and genera retain their vitality? What 

 circumstances result in depriving the eggs of vitality? 



4. Flight distances of the various species and genera, and local 

 conditions influencing flight, such as moisture, wind, etc. 



5. Aquatic plants influencing mosquito production. What are 

 they, in what manner do they influence production and how can 

 they be utilized in mosquito control work? 



6. Factory and chemical wastes which prevent • or favor 

 mosquito-breeding. What are they, and can they be utilized in 

 mosquito control work? 



7. How is it that some places, which apparently should, do not 

 produce mosquitoes? What is the connection between the 

 animal and plant life, chemical and physical properties of the 

 water in such pools and the absence of breeding therein? 



8. Some larvicide that does not require replacement as soon as 

 oil and the larvicides now in use. Some larvicide that will be 

 cheaper than those now in use. 



These are some of the maii3 r points about mosquitoes that 

 more light is desired on. Observation of field workers may result 

 in considerable progress being made. 



1 Adapted from circular of Office of Field Investigations of Malaria, U. S. 

 Public Health Service. 



