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Biological Control
Volume 7, Issue 3, December 1996, Pages 316-319
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Copyright © 1996 Academic Press, Inc. All rights reserved.

Regular Article

Biological Parameters for Four Coccinellid Species in Central Saudi Arabia


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El Tayeb A. ElHag and Ahmed A. Zaitoon

Department of Crop Protection, College of Agriculture, King Saud University, P.O. Box 1482, Buraydah, Saudi Arabia

Received 18 March 1996; 
accepted 10 June 1996. ;
Available online 19 April 2002.


Developmental and reproductive rates ofAdonia variegataGoeze,Coccinella novemnotataHerbst,C. septempunctataL., andC. undecimpunctataL. were studied in wheat and barley in Central Saudi Arabia. Beetles were reared in the laboratory at 25 ± 2°C onBrevicoryne brassicae(L.) andRhopalosiphum padiL.A. variegataandC. undecimpunctatahad significantly higher egg hatching (X = 81.8 and 74.5%), adult longevity (X = 71.8 and 70.0 days), and survival (X =  61.8 and 61.5%), respectively.Coccinella undecimpunctatahad the highest fecundity (X = 370.5 eggs/female) and longest oviposition period (X = 29.8 days).C. septempunctataexhibited the lowest values for these biological parameters. No differences were evident in the total developmental time or egg and pupal duration, although species differences occurred in the larval duration. Larvae ofA. variegatadeveloped faster (X = 11.8 days) than Larvae ofC. septempunctata(X = 12.0 days),C. undecimpunctata(X = 12.2 days), orC. novemnotata(X = 13.1 days). The intrinsic rate of increase (rm) and predicted population density were higher forC. undecimpunctata(X = 0.093 and 98553) after 60 days than forC. novemnotata(X = 0.088 and 59405),C. septempunctata(X = 0.086 and 35033), orA. variegata(X = 0.082 and 37991), respectively.

Author Keywords: coccinellidae; Triticum aestivum; developmental rates; biological control

Biological Control
Volume 7, Issue 3, December 1996, Pages 316-319
Result list | previous < 119 of 166 > next 
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