Larvicidal and ovipositional activity of Calotropis procera, neemazalt and Eucalyptus spp. against Culex pipiens

Document Type : Original Article

Authors

Plant Protection Department, College of Agriculture, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia

10.21608/jpces.2000.460571

Abstract

Neemazalt, a commercial formulation containing 5 % azadirachtin (AZ), a cardenolide extract isolated from Calotropis procera R.Br. (Asclepiadaceae), and a Calotropis procera extract purchased from Sigma were tested for their larvicidal activity against first and fourth instar larvae of Culex pipiens at 23 ± 2 ºC. The LC50 values for the three materials against the 1st instar larvae, after 96h, were 0.74, 4.8, and 4.1 mg /1, respectively. LT50 values for AZ against the fourth instar larvæ were 4.6, 3.4, 3.25, and 3.1 days at 5, 7.5, 10, and 12.5 mg/l, respectively. The LC50 value for the isolated extract against the 4 th instar larvae was 27 mg/l, after 72 h. The isolated extract and the volatile oils of Eucalyptus camaldeulensis Dehnh E. fideroxylon (Myrtaceae) inhibited oviposition at 50 mg/l, whereas AZ inhibited oviposition at 2.5 mg/l.

Keywords

Journal of Pest Control and Environmental Sciences
Volume 8, Issue 3
December 2000
Pages 15-26

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