HDC releases latest findings of study into chemical control of downy mildew on Impatiens

The Horticultural Development Company (HDC) has sent its members the latest results of a trial that is looking at whether a range of fungicides are safe to use on Impatiens.

Project PC 230 has been set up to inform growers how to prevent attacks by Impatiens downy mildew, which caused devastation to busy lizzies in nurseries, garden centres and parks last year.

As part of the project, a team at Stockbridge Technology Centre have undertaken a crop safety trial using a range of available fungicides and a few experimental mixes. They found that none of the fungicides produced any adverse side effects on young Impatiens plants.

Fubol Gold and Karamate Dry Flo Newtec did leave spray deposit on the leaves.

Authors Martin McPherson and Cathryn Lambourne concluded: "Early results appear quite promising and suggest that the various products tested here are relatively crop safe on Impatiens (including New Guinea types). However, due to differences in cultivars and types being grown, and changes to the climatic and other conditions on different nurseries, it is always advisable to test treat a few plants when using a particular product for the first time on a crop."

HDC members can get further information at the organisation's website. It  will be mailing the updated Impatiens downy mildew fact sheet to the industry shortly.


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