Insecticidal effects of azadirachtin on the cotton leafworm, Spodoptera littoralis (Boisd)
Hussein, H., Al-Rajhy, D., Abou-Tarboush, F., El-Ashmaoui, H., Al-Assiry, M. (2003). Insecticidal effects of azadirachtin on the cotton leafworm, Spodoptera littoralis (Boisd). EKB Journal Management System, 11(1), 77-86. doi: 10.21608/jpces.2003.459429
Hamdy Hussein; DiefAlla Al-Rajhy; Faisl Abou-Tarboush; Hassan M. El-Ashmaoui; Mohamed Al-Assiry. "Insecticidal effects of azadirachtin on the cotton leafworm, Spodoptera littoralis (Boisd)". EKB Journal Management System, 11, 1, 2003, 77-86. doi: 10.21608/jpces.2003.459429
Hussein, H., Al-Rajhy, D., Abou-Tarboush, F., El-Ashmaoui, H., Al-Assiry, M. (2003). 'Insecticidal effects of azadirachtin on the cotton leafworm, Spodoptera littoralis (Boisd)', EKB Journal Management System, 11(1), pp. 77-86. doi: 10.21608/jpces.2003.459429
Hussein, H., Al-Rajhy, D., Abou-Tarboush, F., El-Ashmaoui, H., Al-Assiry, M. Insecticidal effects of azadirachtin on the cotton leafworm, Spodoptera littoralis (Boisd). EKB Journal Management System, 2003; 11(1): 77-86. doi: 10.21608/jpces.2003.459429

Insecticidal effects of azadirachtin on the cotton leafworm, Spodoptera littoralis (Boisd)

Journal of Pest Control and Environmental Sciences
Volume 11, Issue 1, June 2003, Pages 77-86    PDF (223.42 K)
Document Type: Original Article
DOI: 10.21608/jpces.2003.459429
Authors
Hamdy Hussein* 1; DiefAlla Al-Rajhy1; Faisl Abou-Tarboush2; Hassan M. El-Ashmaoui2; Mohamed Al-Assiry1
1king Saud University, College of Agriculture, Plant Protection Department, Riyadh 1 1451 P. O. Pox 2460
2King Saud University, College of Science, Zoology Department. Riyadh 11451 P. O. Pox 2455
Abstract
The effects of Neemix 4.5 % (4.5 % azadirachtin) on different larval instars of the cotton leafworm, Spodoptera littoralis, were studied by feeding the larvae on castor bean leaves treated with different concentrations of azadirachtin. The second instar larvae were the most sensitive amongst the three larval instars exposed to various treatments. The concentrations that caused 50 % reduction in pupation of the second, third and fourth larval instars were 3.67, 10.75 and 10.92 ppm, respectively. Azadirachtin caused different effects including stop of feeding, inhibition of pupation, formation of intermediates and malformed pupae and adults. The compound showed contact toxicity when it was applied topically to the larvae and contact toxicity much less the feeding toxicity. Topical application treatment caused same effects of feeding toxicity. The treatments caused reduction of egg mass production in a concentration-dependent manner. However, azadirachtin did not prevent S. littoralis females from oviposition on treated plant leaves. The results generally indicate that azadirachtin is a successful insecticide, which may be used in integrated pest management programs to prevent or delay appearance of resistance to conventional pesticides
Keywords
Insecticidal effects; azadirachtin; cotton leafworm; Spodoptera littoralis (Boisd)
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