Pests + Diseases

Question 1

What are the major trunk diseases?

Answer 1

Esca
Eutypa - Dieback
Phomopsis
Botryosphaeria
Petri (young vines)
Black Foot (young vines)

Question 2

Treatments for trunk diseases

Answer 2

• At nursery, hot water treatment = ** for ** minutes
• At nursery, better sanitation for bench grafts
• Painting the wound - borid acid (anti-fungal), latex paint (just a seal), ** (organic treatment)
• Sanitize pruners between wounds (at Dujac they sanitize clippers between each vine)

Question 3

Treatment for Nematodes

Answer 3

(Can be vector for fanleaf virus via X. Index bacteria)

• Plant on resistant rootstock (039-16 = very vigorous, vinifera in parentage; almost of To Kalon)
• cover crop: brassicas (mustard, daikon) as a fumigant
• Fallow (**Dominus)

Question 4

Pierce’s Disease

Answer 4

Blue-Green (** California)
Glassy-Wing (** California)

Treatment:
- restoration of riparian corridors, removal of

Question 5

Mildew

Answer 5

Powdery (hot, dry climate)- Oidium -
Downy (cool, wet climate) - Bordeaux mixture (copper sulfate + lime)
Botrytis -

Question 6

Virus

Answer 6

Leaf Roll - (vector = mealybug) can spread leaf roll - predator is wasp
Red Blotch - (vector = alfafa hopper) affects pyrazines
Fan Leaf - (vector = nematode)

Question 7

Flavescence Doree

Answer 7

(vector = American grapevine leaf hopper), mostly in the south of Europe.
no treatment except prevention
2013 mandatory non-organic spray - Giboulot fought and threatened with jail time, big fine)