ABUNDANCE AND DISTRIBUTION OF THE GRAPE PHYLLOXERA, PHYLLOXERA VITIFOLIAE, IN THE NIAGARA PENINSULA, ONTARIO
Open Access
- 1 January 1963
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Plant Science
- Vol. 43 (1) , 38-43
- https://doi.org/10.4141/cjps63-006
Abstract
A survey was made in vineyards in the Niagara Peninsula, Ontario, in 1959–1961 to determine the distribution and abundance of the root form of the grape phylloxera [Phylloxera vitifoliae (Fitch)]. The insect was found on roots in 72 of 73 vineyards surveyed, and in 33 others that were not sampled in detail. All vines sampled were infested in 28 of the 73 vineyards. There were only 6 vineyards in which the infestation never exceeded 25 per cent. Phylloxera root injury, as expressed by a gall index, was moderate or lighter in most vineyards. Infestations were lightest on loam and sandy loam soils, such as Vineland fine sandy loam. The variety Delaware was the most heavily infested. The effect of the observed root injury on the vines was not determined.Keywords
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