Dispersion Statistics and Sample Size Estimates for Tetranychus kanzawai (Acari: Tetranychidae) on Mulberry

Chyi-Chen Ho

doi:10.1093/ee/22.1.21

Dispersion Statistics and Sample Size Estimates for Tetranychus kanzawai (Acari: Tetranychidae) on Mulberry

Journal

Environmental Entomology

Journal Volume

22

Journal Issue

1

Pages

21-25

Date Issued

1993-02

Date

1993-02

Author(s)

Chyi-Chen Ho

DOI

10.1093/ee/22.1.21

URI

https://scholars.tari.gov.tw/handle/123456789/5403

Abstract

Dispersion indices were calculated for Tetranychus kanzawai Kishida in groves of mulberry, Morns alba (L.), in Taiwan. These indices indicated a clumped distribution for the surveyed population range of T. kanzawai: 0.53–96.5 mites per leaf. However, the X2 goodness-of-fit test generally rejected the negative binomial model among trees, but accepted it within trees. The level of aggregation varied with the population density of T. kanzawai and among mulberry groves. The dispersal of spider mites is discussed as a factor affecting this parameter. Optimal sample size is estimated for various densities of T. kanzawai and error margins on the assumption of Taylor's power law and mean crowding-mean regression.

Subjects

Tetranychus kanzawai

mulberry

dispersion

Publisher

Entomological Society of America

Type

journal article

File(s)

Name

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Size

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Format

HTML

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