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ROMEILAH, M. (2000). MEASURING THE DISTRIBUTION OF PINK AND SPINY BOLLWORMS IN DIFFERENT GOVERNORATES IN EGYPT. Egyptian Journal of Agricultural Research, 78(3), 1091-1104. doi: 10.21608/ejar.2000.322669
MOHAMED A. ROMEILAH. "MEASURING THE DISTRIBUTION OF PINK AND SPINY BOLLWORMS IN DIFFERENT GOVERNORATES IN EGYPT". Egyptian Journal of Agricultural Research, 78, 3, 2000, 1091-1104. doi: 10.21608/ejar.2000.322669
ROMEILAH, M. (2000). 'MEASURING THE DISTRIBUTION OF PINK AND SPINY BOLLWORMS IN DIFFERENT GOVERNORATES IN EGYPT', Egyptian Journal of Agricultural Research, 78(3), pp. 1091-1104. doi: 10.21608/ejar.2000.322669
ROMEILAH, M. MEASURING THE DISTRIBUTION OF PINK AND SPINY BOLLWORMS IN DIFFERENT GOVERNORATES IN EGYPT. Egyptian Journal of Agricultural Research, 2000; 78(3): 1091-1104. doi: 10.21608/ejar.2000.322669

MEASURING THE DISTRIBUTION OF PINK AND SPINY BOLLWORMS IN DIFFERENT GOVERNORATES IN EGYPT

Article 10, Volume 78, Issue 3, September 2000, Page 1091-1104  XML PDF (4.15 MB)
Document Type: Original Article
DOI: 10.21608/ejar.2000.322669
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Author
MOHAMED A. ROMEILAH
Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt
Abstract
Dispersion indices, including (K) the negative binomial distribu­tion, Green's coefficient of dispersion (CO mean crowding (m"), Lioyd's (Patchiness index (m/m*) and variance mean ratio (v/m), were calculat­ed for the populations of two cotton bollworm moths, Pectinophora gos­sypiella and Earias insutana using light traps allover 2 years (January 1997 to December 1998) at five different Governorates, El-Minia, El­Sharkia, Kafr Et-Sheikh, Demeate and El-Kalubia. Comparison showed that: K, Cx and Wm' as well as slopes from regression, all indicated that under the conditions of this test (at densities tested), the popula­tions of the two pests were random. The variance/mean (v/m) ratio fluctuated considerably more than other indices examined, which by comparison, appears less reliable than previously thought.
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