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New Zealand Plant Protection 69 (2016): 213-220

Monitoring methods and spatial patterns of European canker disease in commercial orchards

R.E. Campbell, S. Roy, T. Curnow and M. Walter

ABSTRACT

European canker (Neonectria ditissima) kills trees and decreases production in apple orchards. To determine a level of disease control or the extent of its spread in commercial orchards, efficient monitoring methods are required. In this study, we investigated two monitoring methods, sampling a single row and systematic sampling of an orchard block. The spatial pattern of disease within blocks, and whether this changes over time, was also investigated. The accuracy of single-row monitoring depended on the level of canker in the orchard and the patchiness of the distribution of infected trees. However, single-row monitoring tracked changes over time in incidence, severity and type of canker sufficiently well and was efficient. The spatial patterns of disease incidence across the blocks were non-random, but showed hotspots which did not change significantly over time.

Keywords: apple, disease monitoring, Neonectria ditissima, spatial disease patterns.

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