Susceptibility of Phlebotomus argentipes against DDT in endemic Districts of North Bihar, India
Kishore, K.; Kumar, V.; Kesari, S.; Bhattacharya, S.K.; Das, P.
Journal of Communicable Diseases 36(1): 41-44
2004
ISSN/ISBN: 0019-5138 PMID: 16295685 Document Number: 573687
Susceptibility status of Indian kala-azar vector Phlebotomus argentipes after DDT spray from endemic areas of Muzaffarpur and Vaishali district and unsprayed non-endemic area of Patna district, Bihar, India were compared. Higher Lc50 viz. 2.6% and 3.2% and LT50, values 51.0 and 69.0 minutes to 4% DDT were observed for P. argentipes of Muzaffarpur and Vaishali district, whereas P. argentipes of Patna district was 100% susceptible to same concentration, indicating increased tolerance in P. argentipes. It is concluded DDT resistant P. argentipes, particularly in endemic zone growing. The possible explanation could be long-term insecticidal pressure.