New Zealand Plant Protection 69 (2016): 207-212
The fungus Neonectria ditissima can cause European canker in apple nursery trees. In this study, ten treatments of 'EMLA 9' rootstocks budded with 'Royal Gala' were examined, 5 Treatments included combinations of five budding tapes, two budding methods and three fungicidal treatments. Fifteen months after inoculation, all T-budded trees had died. Chipbudded trees inoculated after tying with either Flexiband type C or plastic pre-cut strips displayed significantly more canker (21% and 22%, respectively) than those tied with Buddy tape (11%, P<0.001). Of the uninoculated trees, 9% displayed canker symptoms, because either the budding wounds were infected by natural inoculum, or the infection was present in the scion or rootstock before budding. Treating buds with tebuconazole/carbendazim reduced canker symptoms significantly (2%, P<0.001). Calcium hydroxide also reduced canker symptoms (5%). Pyraclostrobin/boscalid did not reduce canker incidence.
Keywords: Neonectria ditissima, apple, propagation, nursery tree, budding, budding tapes, wound protection.
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Copyright © 2016 New Zealand Plant Protection Society (Inc.).