Blood feeding insects require the blood meal from their hosts as a prerequest for ovarian development.This behavior is not nescessary to be the absolute one but the plant may be considered for their first diet. This is good but this process don not seem to be easy and many factors found to play a role that more or less have an effect for the insects to target their host.Mainly these factors are expressed in terms of chemical ecology;insects have a chemoreceptors.Insect olfaction and taste are the major aspects of insect chemical ecology.Identification of these receptors made us go a head and pass the way to solve the gap of insects behavior although the wide range of insects hosts combining with their wide distribution may complicate the problem but we are optimistic to go forward and return with a good impact factor from research in such era.

The vector select their preferable host according to their feeding preference controlled by its own.

Here is a Cartoons image