Influence of seasonal changes in climate on dispersal of released Culex pipiens fatigans: a study in villages in Delhi Union Territory, India.

Studies on Culex pipiens fatigans dispersal were conducted during the hot, cold, rainy, and post-rainy seasons in 2 villages in the Delhi area in order to improve techniques and to determine the optimum time of release. Releases from one central point and from a number of points were evaluated. No directional effect on dispersal was observed. Dispersal was most rapid and extensive in the hot season and slowest and most limited during the cold season, when the released mosquitos tended to remain near the release sites. No significant difference was noticed between male and female dispersal, and both sexes showed a uniform dispersal pattern 2 days after release.