644 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



both of which we illustrate, are the House Mosquito (Culex 

 pipiens), and the Salt-Marsh Mosquito (Culex sollicitans). 



Mosquito control is based upon the breeding habits. Eggs, 



FIG. 562. The yellow-fever 

 mosquito: pupa. Much en- 

 larged. After Howard, U. 

 S. Dept. of Agr. 



FIG. 563. Culex pupa. After 

 L. O. Howard, U. S. Dept. 

 of Agr. 



larvae and pupae are found 1 in the water. If stagnant water is 

 removed from a locality the mosquitoes will go. If it is removed 

 in part, the mosquito plague will be lessened. If it is rendered 

 unfit for the mosquito in any way the effect will be the same. 

 Control measures, therefore, in- 

 clude drainage of swamps, ponds, 

 pools and other standing water 

 where possible ; the oiling of stand- 

 ing water that can not be drained 

 away^ since a film of oil on the 

 surface of the water destroys 

 all stages of the mosquitoes in 

 the water and effectively prevents 



breeding so long as it remains; 



FIG. 564. A mosquito egg-boat and 



treating water with chemicals to larvae just hatched (Cvlex). From 

 destroy young of the mosquito; Howard, U. S. Dept. of Agr 

 stocking sluggish streams and artificial lakes with species of fish 

 which feed on mosquito larvae and pupae. Of these the most 

 effective method is drainage. To be thoroughly effective it must 

 take into account not only large bodies of water but also the water 

 which may stand in sewers, old cans in a back yard, stopped-up 



