| Titles |
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English :
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Spatial distribution patterns of two cotton bollworms, Pectinophora gossypiella and Earias insulana in Fayoum, Egypt
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| Abstract |
Dispersion indices, including (k) negative binomial distribution, Green's coefficient of dispersion (Cx), mean crowding (m*), Lloyd's (Patchiness index) (m*/m) and variance mean ratio (V/m), were calculated for the populations of two cotton bollworms male moths, Pectinophora gossypiella (Saund.) and Earias insulana (Boisd.) using pheromone traps all-over 2 years (Dec. 91 to Nov. 93) at Sanoris district, Fayoum governorate. Comparison showed that: k, CX and m /m as well as slopes from regression, all indicated that under the conditions of this test (at densities test), the populations of the two pests were random. The variance/mean ratio fluctuated considerably more than other indices examined, which, when coupled with strongly dependent relationship with mean, suggested that this index may be less reliable than previously thought
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| Publication year |
1994
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| Pages |
805-813
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| Availability location |
معهد بحوث وقاية النباتات - ش نادى الصيد - الدقى
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| Availability number |
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| Organization Name |
Plant Protection Research Institute (PPRI)
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| City |
شبرا الخيمه-القاهرة
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| serial title |
حوليات العلوم الزراعية
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| ISSN |
0570-1783
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| Author(s) from ARC |
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| Agris Categories |
Pests of plants
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AGROVOC
TERMS |
Earias insulana.
Pectinophora gossypiella.
Pheromone traps.
Spatial distribution.
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| Publication Type |
Journal
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