Evidence for Random Local Spread of Aphid-borne Mild Yellow-edge Virus in Strawberries

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Abstract
The spread of aphid [Chaetosiphon fragaefolii]-borne strawberry mild yellow-edge virus was studied along short rows in a field in western Oregon [USA] during a 37-mo. period. The number of infected plants [Fragaria .times. ananassa] adjoining other infected plants (doublets) was compared with the total number of infected plants per plot. The methods of van der Plank and Freeman were used to predict doublet occurrence, but their methods were revised for computing variance. The pattern of doublet occurrence approximated the pattern predicted from a random distribution and is consistent with the assumption that mild yellow-edge virus infections occurred at random within plots.