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Journal of Agricultural Science and Technology، جلد ۱۶، شماره ۶، صفحات ۱۲۴۱-۱۲۵۲
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عنوان انگلیسی Sampling Procedure and Temporal-Spatial Distribution of the Cabbage Aphid, Brevicoryne brassicae L. (Hemiptera: Aphididae), on Canola
چکیده انگلیسی مقاله To estimate population density of the cabbage aphid, Brevicoryne brassicae (L.), a stratified random sampling was conducted in two unsprayed canola fields in Isfahan (central Iran) during 2011-2012. Population density was determined for apterous, and alates, as well as the total population, at two plant growth phases (PGP1: From plant emergence to the end of rosette, and PGP2: From the beginning of stem elongation to ripening) on the whole plant as the sampling unit. Sources of variation in the sampling procedure were analyzed with a nested analysis of variance (NANOVA). In PGP2, aphid density in upper (10-15 cm upper part of stem) and lower (the rest of stem) parts were compared using Student’s t-test. Temporal changes in spatial pattern during the growth season were evaluated using 1/k (aggregation index) and Lloyd’s Patchiness Index. Results showed that differences among fields accounted for the majority of total variation observed in aphid densities and the aphids significantly preferred upper parts of canola plants. Among different indices used for analyzing spatial distribution of the aphid, Taylor’s Power Law (TPL) described well the relationship between variance and mean of the population. In both PGPs spatial patterns of apterous, alates, and total population were aggregated, random, and aggregated, respectively. Estimates of 1/k and changes in the value of patchiness index revealed that the aphid population was aggregated at the beginning of rosette stage and became more dispersed with time.
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نویسندگان مقاله محمدرضا نعمت اللهی | m r
department of entomology, faculty of agriculture, tarbiat modares university, p. o. box 14115-336, tehran, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه تربیت مدرس (Tarbiat modares university)

y فتحی پور |
department of entomology, faculty of agriculture, tarbiat modares university, p. o. box 14115-336, tehran, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه تربیت مدرس (Tarbiat modares university)

علی اکبر طالبی | a a
department of entomology, faculty of agriculture, tarbiat modares university, p. o. box 14115-336, tehran, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه تربیت مدرس (Tarbiat modares university)

j کریم زاده |
department of plant protection, isfahan research center for agriculture and natural resources, p. o. box 199-81785, isfahan, islamic republic of iran.

m zalucki |
school of biological sciences, the university of queensland, st. lucia, qld 4072, australia.

نشانی اینترنتی http://jast.modares.ac.ir/article_11642_faa6c86ceb4207fda66aff61178767c9.pdf
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