Grape phylloxera (Daktulosphaira vitifoliae (Fitch)(Homoptera Phylloxeridae) vectors fungal pathogens which can kill roots. Vineyards affected by grape phylloxera may succumb rapidly or over a long period of time. We hypothesized that vine stress might mitigate rate of vine decline. In a preliminary 2002 test we inoculated water stressed and not stressed Teleki 5C rootstock with high and low virulence Fusarium oxysporum cultures. Water stressed vines had higher levels of fungal necrosis after 5 weeks than unstressed vines. We therefore set up a replicated test in 2003 using water, hedging and crop load stresses. Data on fungal infection and insect demography through harvest are reported. Results have implications for management of vines that normally includes stress conditions.
Species 1: Homoptera Phylloxeridae Daktulosphaira vitifoliae (grape phylloxera)
Keywords: grapes, Fusarium
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