Environmental Entomology (1993) 22, 21-25

Chyi-Chen Ho (1993)
Dispersion statistics and sample size estimates for Tetranychus kanzawai (Acari: Tetranychidae) on mulberry
Environmental Entomology 22 (1), 21-25
Abstract: Dispersion indices were calculated for Tetranychus kanzawai Kishida in groves of mulberry, Morus 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 Chi² 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Chyi-Chen Ho

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranychus kanzawai	Mulberry (Morus)	Taiwan