Winter is passed either as eggs or pupae. Feeding Habits Only female mosquitoes suck blood which is needed to lay eggs. Males feed on plant nectar. Most mosquitoes, but not all feed after dark or early morning hours. Daylight hours are spent in dark damp places.
Some species also feed in daylight hours and others day and night.
The blood sucking habit is what causes mosquitoes to become a vector for disease. If a female mosquito feeds for example on the blood of a malaria carrying person, the disease organisms survive and reproduce in the mosquitoes, ending up in her salivary glands. Next time she feeds on a new host, she inoculates her new host. Seasonal Abundance Mosquitoes may breed at any time from spring to the first frost. Populations are generally highest in summer and early fall.