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The New Zealand onion industry is concerned that strains of the onion downy mildew fungus, Peronospora destructor, may be resistant to phenylamide fungicides. This experiment was a preliminary investigation to determine whether such fungicide resistance problems exist in onions at Pukekohe. Onions cv. Sweet Red (four true leaf stage) grown in polystyrene trays were sprayed with metalaxyl-M, metalaxyl, dimethomorph and water. The following day, fine mists of sporangiospore suspension (1 x 10/ml) were applied to the onion foliage. The inoculated plants were covered with polythene to create moist chambers and incubated at 13°C overnight. The polythene was removed and the plants were placed in a greenhouse. After 13 days, the onion plants were again covered with polythene and incubated at 13°C overnight. The following morning active P. destructor sporulation occurred on 79% of control plants. Both metalaxyl and metalaxyl-M treatments had 12% plants with sporulating lesions, and the dimethomorph treatment had just 1%, indicating that some strains of P. destructor may have some level of resistance to metalaxyl and metalaxyl-M. Further tests will be carried out to investigate the effectiveness of metalaxyl and metalaxyl-M when applied after, as well as before, inoculation of onion foliage with P. destructor.

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

Resistance of <i>Peronospora destructor</i> (onion downy mildew) to metalaxyl fungicides