On a model pair Aedes aegypti--Plasmodium gallinaceum in has been shown that 
changes in the conditions of larvae development caused by the addition into the 
water medium of the live culture of Synochocystis sp. cyanobacteria or green 
seaweeds Chlorella vulgaris, acetone extracts from the live culture precipitate 
or Chlorella powder, as well as nitrogen-containing fertilizer--ammonium 
chloride did not lower the sensitivity of the imago flying to malaria parasites. 
The results of the experiments assessing the effect of biologically active 
compounds introduced into the larvae habitation medium on the ability to change 
sensitivity of the survived mosquito females to malaria agent have been summed 
up. The data obtained are indicative of the high level of mutual adaptation 
between mosquito-carriers and malaria parasites.