Larvicidal and ovipositional activity of Calotropis procera, neemazalt and Eucalyptus spp. against Culex pipiens | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 8, Issue 3, December 2000, Pages 15-26 PDF (328.62 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2000.460571 | ||
| Authors | ||
| D. Al-Rajhy* ; Hamdy I. Hussein; M. S. El-Osta; A. G. Ali | ||
| Plant Protection Department, College of Agriculture, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia | ||
| 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 | ||
| Azadirachtin; Calotropis procera; Culex pipiens; Eucalyptus; larvicides; mosquito; neem; ovinosition | ||
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