OBSERVATIONS ON THE DEVELOPMENT CYCLE OF AEDES (F.) TOGOI UNDER LABORATORY AND NATURAL CONDITIONS
ARMY BIOLOGICAL LABS FREDERICK MD
Pagination or Media Count:
Conclusions Ae. F. togoi in the southern regions of Primorskoy Kray may yield the emergence of four generations, the last of which is incomplete. Out of some of the eggs laid by females of generation 4 larvae develop, but their development does not reach the stage of emergence, and with the freezing of the reservoirs they die. Mosquitoes of generations 3 and 4 have the greatest epidemiological importance. Under constant temperatures, the development of the water stages of Ae. F. togoi is possible to some degree within the limits of from 5 to 35-37 degrees. The optimum temperature for development is found within the limits of 24--27 degrees. With fluctuations in temperature the development is speeded up by 20 and the limit of the temperature optimum is expanded in the direction of a higher temperature fluctuations reach an upper limit of 30--32 degrees. Under all conditions of observation a characteristic peculiarity is noted for Ae. F. togoi -- a great scattering in the periods of emergence of larvae from eggs of the same laying. This explains the lengthiness of the generations. In the first two generations a predominance of males is noted, but with generation 3 the females clearly predominate. The wintering of Ae. F. togoi in Primorskoy Kray takes place in the egg stage. Wintering is carried out mainly by the egg mases of mosquitoes from generations 3 and 4.
- Anatomy and Physiology