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New Zealand Plant Protection 65 (2012): 256-261

Effect of partial defoliation on Cylindrocarpon destructans infection of grapevines

D. Brown, E.E. Jones, H.J. Ridgway and M.V. Jaspers

ABSTRACT

One-year-old grapevines of Sauvignon blanc grafted to rootstocks 101-14 or Schwarzmann were used to evaluate the effects of partial defoliation and inoculation with C. destructans on disease severity, incidence and dry weight accumulation. Assessment 8 months after treatments showed that disease incidence was not affected by the defoliation treatments. However, disease severity was significantly highest for the highly defoliated plants (P=0.043). Incidence and severity were similar for Schwarzmann (29.3 and 8.4%, respectively) and 101-14 (31.0 and 14.9%, respectively). Root dry weight was affected by the defoliation treatments (P=0.000), being significantly lower in the highly defoliated plants than the moderately defoliated and undefoliated plants (15.6, 18.5 and 19.9 g, respectively). The practice of leaf removal in young vines clearly needs to be managed when black foot is a recognised risk factor for newly planted vineyards.

Keywords: black foot, shoot trimming.

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