[1] Downy mildew plant pathogens are often host specific and cause problems in cloudberries, blackberries, boysenberries, strawberries, and arctic bramble.

The most common symptoms include red lesions in the veins of leaves, with dry and deformed berries.

A few examples are downy mildew on the Arctic Bramble issue in Finland and Colombian greenhouse rose production.

However the irregular yield and “dryberry” effect from downy mildew has restricted the expansion of the industry.

"The products ALIETTE (fungicide), PHOSFIK (leaf fertiliser) and BION (pathogen defence elicitor) were effective in downy mildew control, Aliette and Phosfik being more effective than Bion especially in preventing yield losses.

A few rose and blackberries have been found to be more resistant but breeding and other control methods need to be put in place.

Constant use of fungicides can cause pathogen mutations and no longer control the downy mildew.