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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Research Unit » Research » Publications at this Location » Publication #174595
Title: THE INTERACTIONS OF IRRIGATION, FERTILIZATION AND SOIL ON THE EXPRESSION OF SYMPTOMS AND DAMAGE IN WINEGRAPE INFESTED WITH GRAPE PHYLLOXERA [DAKTULOSPHAIRA VITIFOLIAE (FITCH)]

Author
item Fisher, James
item CHITKOWSKI, REBECCA - OREGON STATE UNIVERSITY

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 10/13/2004
Publication Date: 12/4/2004
Citation: Fisher, J.R., Chitkowski, R. 2004. The interactions of irrigation, fertilization and soil on the expression of symptoms and damage in winegrape infested with grape phylloxera [daktulosphaira vitifoliae (fitch)][abstract]. Northwest Center for Small Fruits Annual Conference.

Interpretive Summary:

Technical Abstract: The overall objective for this three-year study (2003 - 2005) is to determine if increased plant vigor and irrigation affect grape phylloxera (GP) establishment, delay the outward appearance of symptoms of GP, and maintain plant health when infested with GP. This study includes field and greenhouse research designed to achieve this objective. The objective for year two was to continue vineyard management, set up greenhouse studies, and collect second year phylloxera. There are two studies, a greenhouse study and a field plot study. For the greenhouse study, grapes were placed under a line drip irrigation system that kept pots with self-rooted grapes at one of 4 moisture levels (0.1, 0.8, 2, and 15 bars). Pots were either infested with 200 grape phylloxera eggs or were not infested. Moisture did not have a significant effect on populations (P = .06), but those at 2 bars produced a higher number of phylloxera than drier or wetter regimes. In the field study, vigor was regulated with fertilizer (none vs added) and the drip irrigation system. Phylloxera were found on the infested plants, but no significant differences in the number of phylloxera per gram were found among treatments. The data are inconclusive at this time as to whether the treatments have an effect on phylloxera populations. In addition to the logistic problems in the greenhouse maintenance that affected plant health and moisture regimes, many aspects of the methodology will be improved. The experimental procedure has been modified for the 2005 study to consider the previous pitfalls.