The advice body warns: "As growing media temperatures increase, so does the feeding activity of the larvae and in turn, crop damage. It is best to treat affected crops, where feasible, as quickly as possible. Where damage is severe, disposal to landfill is the best option."
The pathogenic nematode Steinernema kraussei (for instance Exhibitline SK, Nemasys L) may be used.
Meanwhile, downy mildew has been reported on Aquilegia, Digitalis and unusually, Alchemilla
ADAS says suitable products for growers include Folio Gold (ref. EAMU 0031/12 under protection), Pergado Uni (EAMU 1605/12), Amistar (ref. SOLA 0443/09) and Valbon (ref. SOLA 1529/10).
Fubol Gold (ref. SOLA0217/12) can also be used as an eradicant to control disease outbreaks.
Fortnightly applications of a suitable potassium phosphite product can help to boost plant resistance to infection, advises ADAS.