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On 13 January 2006, the MAF Investigation and Diagnostic Centre (IDC) was alerted by a corn seed-crop manager to a possible new to New Zealand corn disease in Gisborne. Samples were immediately collected by IDC and identified as the Basidiomycete fungus Ustilago maydis Corda, which was later validated by Landcare Research. A survey of the field showed that symptomatic plants were concentrated to five rows in the field’s south-east corner. Symptomatic plants observed in the field were immediately removed and destroyed. A delimiting survey of associated Zea mays crops showed no further infection in the region. Remaining plants in the original field were cut and processed into silage to kill any spores. The field was then cross-sown with ryegrass to minimise disease spread. Machinery used on the property was traced for cleaning and disinfection. The likely pathway of entry to New Zealand was considered to be contaminated seed. Library seeds of all seed-lines of interest were tested by IDC, and spores of the correct dimensions and morphology for U. maydis were detected in all samples. However, the majority of spores were considered non-viable due to heavy loading of fungicide on the seeds. Further organism management and surveillance actions are planned for spring 2006.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

New to New Zealand detection of common smut of corn (<i>Ustilago maydis</i>) from a single cornfield in Gisborne