Environmental Entomology (1987) 16, 839-846

C. Inayatullah, W.S. Fargo and J.A. Webster (1987)
Use of multivariate models in differentiating greenbug (Homoptera: Aphididae) biotypes and morphs
Environmental Entomology 16 (4), 839-846
Abstract: Studies were conducted to determine nature and amount of morphometric variability within the greenbug, Schizaphis graminum (Rondani), in an effort to further understand biotypes of this species. Data on morphometrics of the four morphs (males, apterous/viviparous, apterous/oviparous, and alate/viviparous females) were pooled for three biotypes (B, C, and E) and various multivariate statistical analyses were performed. The data suggested that the three biotypes formed significantly different groups. The four morphs were also significantly different from each other. When morphs and biotypes were considered simultaneously, the canonical discriminant analysis grouped greenbugs of different morphs into four different, well-isolated clusters. Within each cluster, individuals of each biotype were further grouped into small subclusters. The Mahalanobis distance analysis suggested that biotype E is closely related to biotype C. The distance analysis also indicated that biotype C is closely related to biotype B. Similar Mahalanobis distance analysis also suggested a close association between apterous females and alate females, as stated in the literature.
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Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Schizaphis graminum