Winegrowers Supplies - Diseases and Spraying
Fungal diseases which affect vines:-
Powdery mildew (Oidium)
Downy mildew (Peronospora)
and early in the season Phomopsis and Roter Brenner.
On pure vinifera varieties it is necessary to spray fungicides 'protectively' every 12 days (or
less), from soon after bud
burst until 6 weeks before harvest. There are no 'curative' sprays available, so once damage occurs it is too late.
The most important sprays are the first ones, to keep the population of mildew spores at a low level, before they multiply. My spraying schedule.
Control of pesticides has become a very serious matter in recent years, in particular legal regulations dictate which chemicals are permitted to be sprayed on vines (or any other crop). To see what spray chemicals are approved or have off-label approval for vines you can refer to www.pesticides.gov.uk or www.plantprotection.co.uk.
Different chemicals are needed at different times. Look for wettable sulphur (e.g. SOLFA), Karamate DF, Teldor, Unikat, Scala etc.
Only certain businesses are allowed to sell spray chemicals, and they are qualified to advise about the use of them; I buy from H L Hutchinsons www.hlhltd.co.uk, they arrange to deliver.
Anyone born after 1965 has to go on a course and obtain a certificate before they are allowed legally to do any spraying.
Trunk Diseases: trunk diseases
Insects which affect vines:-
Leaf blister mite:
is very rare but if found is best dealt with by picking off infected leaves and destroying them.