title: Effects of Seasonal and Site Factors on Xiphinema index Populations in Two California Vineyards.
abstract: Sampling of Xiphinema index for 2 years (1993-95) in two California vineyards indicated that a greater number of nematodes occurred during the winter months. The number of juveniles increased four-fold from December 1993 to January 1994, indicating a high reproductive rate during this time. Extremely high or low soil temperatures corresponded to low nematode numbers. Samples were taken from 0 to 31 cm and 31 to 62 cm deep both within and between the vine rows. Numbers of nematodes were greatest at the 0- to 31-cm depth in one vineyard with a loamy sand soil, and at a depth of 31 to 62 cm in the second vineyard, which had a silt loam soil. In both vineyards, X. index population densities were greater within the vine row.
authors.forename: H
authors.initials: H
authors.lastname: Feil
authors.forename: B B
authors.initials: BB
authors.lastname: Westerdahl
authors.forename: R J
authors.initials: RJ
authors.lastname: Smith
authors.forename: P
authors.initials: P
authors.lastname: Verdegaal