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The Research on Spatial Distribution Pattern of Myzus Persicae in Sanming

Author: HuangBenRong
Tutor: GongDaoXin；GuGang
School: Hunan Agricultural University
Course: Crop Science
Keywords: Tobacco Aphidius Spatial distribution pattern
CLC: S435.72
Type: Master's thesis
Year: 2009
Downloads: 12
Quote: 0
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Abstract


This paper, eight kinds of aggregate indices measured in different growth period at different growth stages in different parts of the same period different Tiankuai Aphidius spatial distribution pattern , the measurement results are aggregated distribution . At the same time , causing the aggregation factor made ??a preliminary analysis . Through the the aggregate indices screening and fuzzy clustering , screening reasonable diffusion indicators , ie the Kuno indicators C A , poly block index m * / m and diffusion the index I δ < / sub>. Iwao number of theoretical sampling formula calculated number of theoretical sampling , estimation tobacco aphid population density and the number of the number of sampling tobacco aphid population density and the sampling permissible error is closely related . Compared with the other five kinds of field sampling , double diagonal sampling method is the best . The paper also gives the the tobacco aphid population density Simple estimated empirical equation : λ = 5.3617 (-lnp 0 ) 1.4042 .

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CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Crop pests and diseases and their prevention > Economic crop pests and diseases > Tobacco pests and diseases
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