The Spider Steatoda triangulosa Walckenaer as a Biocontrol Agent Against Tetranychus urticae Koch in Green Houses
Romeih, A., El- Erkousousy, M., Aiad, A. (2014). The Spider Steatoda triangulosa Walckenaer as a Biocontrol Agent Against Tetranychus urticae Koch in Green Houses. EKB Journal Management System, 8(1), 63-66. doi: 10.21608/ajesa.2014.4912
Aml Romeih; M. El- Erkousousy; A. Aiad. "The Spider Steatoda triangulosa Walckenaer as a Biocontrol Agent Against Tetranychus urticae Koch in Green Houses". EKB Journal Management System, 8, 1, 2014, 63-66. doi: 10.21608/ajesa.2014.4912
Romeih, A., El- Erkousousy, M., Aiad, A. (2014). 'The Spider Steatoda triangulosa Walckenaer as a Biocontrol Agent Against Tetranychus urticae Koch in Green Houses', EKB Journal Management System, 8(1), pp. 63-66. doi: 10.21608/ajesa.2014.4912
Romeih, A., El- Erkousousy, M., Aiad, A. The Spider Steatoda triangulosa Walckenaer as a Biocontrol Agent Against Tetranychus urticae Koch in Green Houses. EKB Journal Management System, 2014; 8(1): 63-66. doi: 10.21608/ajesa.2014.4912

The Spider Steatoda triangulosa Walckenaer as a Biocontrol Agent Against Tetranychus urticae Koch in Green Houses

Acarines: Journal of the Egyptian Society of Acarology
Article 13, Volume 8, Issue 1, July 2014, Page 63-66  XML PDF (86.16 K)
Document Type: Original research articles
DOI: 10.21608/ajesa.2014.4912
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Authors
Aml Romeih1; M. El- Erkousousy2; A. Aiad2
1Agric. Zool. Dept., Fac. Agric. Cairo University, Giza, Egypt
2Plant Protect. Res. Inst., Agri. Res. Center, Dokki, Giza, Egypt
Abstract
Two levels of Steatoda triangulosa (25 and 50 individuals/ replicate) were released (one time); on 29th September 2005 at rate 50 individuals and on 20th April 2006 at a rate 25 individuals. For the first level of release, the pre-count in the releasing area with T. urticae was 12.1 individuals / leaf; while it was 12.9 individuals / leaf in (check). The number of T. urticae in the 1st release/ plot decreased gradually from 12.1 on 29th September to 8.03, 5.9, 5.03, 6.36 and 5.8 individuals / leaf on 6, 13, 20, 27 October and 3 November, respectively. T. urticae populations per check plot changed from 12.9 individuals / leaf on 29th September to 15.0, 22.9, 25.1, 31.6 and 54.7 individuals / leaf in the same dates, respectively. Percent reduction of T. urticae in 1st release plot increased gradually to reach 20, 65, 62, 62 and 80% on the previously mentioned days of October and November, respectively. For the second level of release, the pre-count in the releasing area with T. urticae was 7.7 individuals / leaf; while it was 6.7 individuals / leaf in (check). The number of T. urticae in the 1st release plot decreased gradually from 7.7 on 20th April to 6.4, 3.9, 3.4, 1.4 and 0.6 individuals / leaf on 30 May, the 10th, 20th, 30th June and 10th July, respectively. Compared to check plot, T. urticae populations changed from 6.7 individuals / leaf on 20th April to 11.3, 11.2, 18.9, 25.7 and 30.2 individuals / leaf on the same dates, respectively. In addition, the percent reduction of T. urticae increased gradually to reach 51.0, 69.0, 85.0, 95.0 and 81.0%, respectively.
Keywords
Biocontrol; Steatoda triangulosa; Tetranychus urticae
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