Environmental Entomology (1983) 12, 595-598

J.T. Trumble, E.R. Oatman and V. Voth (1983)
Temporal variation in the spatial dispersion patterns of aphids (Homoptera: Aphididae) infesting strawberries
Environmental Entomology 12 (2), 595-598
Abstract: Temporal changes in spatial distribution patterns of aphids infesting winter strawberries in coastal California were determined using Green's Coefficient, C_x Iwao's regression of mean crowding on the mean, and Lloyd's 'Patchiness Index'. Both C, and the Patchiness Index indicated the aphids were initially overdispersed, but became random as populations increased. Distribution remained random following population collapse, suggesting that density-independent mortality factors suppressed populations. Iwao's regression method provided analogous results when populations were temporarily stratified.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): John T. Trumble

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Aphis gossypii	Strawberry (Fragaria)	U.S.A. (SW)
	Myzus persicae	Strawberry (Fragaria)	U.S.A. (SW)
	Macrosiphum euphorbiae	Strawberry (Fragaria)	U.S.A. (SW)
	Chaetosiphon fragaefolii	Strawberry (Fragaria)	U.S.A. (SW)