Insecticide-resistance threatens the control of mosquito-borne diseases like 
malaria or dengue fever. To ensure sustainable vector control we need a full 
understanding of the factors driving the evolution of resistance. We test the 
hypothesis that the expression of insecticide-resistance depends on the 
available resources by rearing genetically DDT-resistant and sensitive larvae of 
Anopheles mosquitoes at three diet regimes, which correspond to 40%, 70% and 
100% of the normal diet and exposing the adult females to DDT 5, 10 and 15 days 
after emergence. In both colonies post-exposure survival decreased with age at 
exposure. Additionally, the food levels and DDT-resistance were positively 
correlated in both colonies, although only in the DDT-resistant one was this 
relationship statistically significant. The impact of larval diet was smaller 
than the effect of age at exposure. We discuss our results and explain the 
implication of this study to resistance monitoring for public health and vector 
management.