Abstract
Aedes trivittatus (Coquillett) breeds in temporary pool situations. It passes the winter in the egg stage and the larvae often may be found during summer in the temporary pools formed by rains. It is observed that there is plenty of plant growth in these pools and the most common plants are Blue-grass (Poa sylvestris Gr.) and nodding Fescue-grass (Festuca nutans Willd.). As first instar larvae are usually observed in these pools immediately after a rain, it was thought that these grasses have something to do with the eggs hatching.