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New Zealand Plant Protection 68 (2015): 241-249

Control of Neonectria ditissima with copper based products in New Zealand

M. Walter, O.D. Stevenson, N.T. Amponsah, R.W.A. Scheper, D.G. Rainham, C.G. Hornblow, U. Kerer, G.H. Dryden, I. Latter and R.C. Butler

ABSTRACT

New Zealand pipfruit crops require postharvest fungicides for control of European canker, caused by Neonectria ditissima. Fungicide efficacy trials to protect leaf scars from N. ditissima infections were conducted during autumn 2013 and 2014. Disease control of artificially inoculated leaf scars was achieved by single applications of copper oxychloride and copper oxide, but not copper hydroxide, applied at 4.3, 1.1 and 0.6 kg elemental copper/ ha respectively. Control of leaf scar infections by copper oxide (0.65 and 0.95 kg elemental copper/ha) was similar to control by captan. Leaf scars (0-10 days old) remained susceptible to infections up to 10 days after leaf fall; disease control was achieved by re-distribution of copper and captan fungicides onto new leaf scars. Disease control using copper oxide was consistent and similar to control using captan. The copper product, and concentration of elemental copper, are important for successful control of leaf scar infections by N. ditissima.

Keywords: European canker, Neonectria galligena, Nectria galligena, copper oxychloride, copper hydroxide, copper oxide, fungicide.

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