Grape/Vine diseases Flashcards
(70 cards)
What’s powdery meldew, where does it come from, what’s the trigger, what’s affected are what are the consequences?
- fungual disease
- native to North America
- affects all green parts of the plant > dusty white mildew growth
- consequences: inhibits bunch development and ripening
> prior to flowering: yields reduced
> after fruit set: berries struggle to reach veraison/ to get ripe
> if fruit affected: off-flavours
Consequences of powdery meldew?
Inhibits bunch development and ripening
> prior to flowering: yields reduced
> after fruit set: berries struggle to reach veraison/ to get ripe
> if fruit affected: off-flavours
Synonym of powdery meldew?
Oidium
or Oidium tuckerii
What’s affected by powdery meldew?
All green parts of the plant
Where does powdery meldew comes from and when was it first recorded in Europe?
North America
1847 in England
What’s the trigger for powdery meldew?
Uncinula necator fungus
What’s Oidium tuckerii?
The Uncinula necatorfungus for Oidium at it’s anamorph stage
How does powdery meldew looks like?
dusty white mildew growth on grapes leaves and shoots
How can powdery meldew can be controlled?
Sulfur, fungicides
What’s the synonym for Downy Meldew?
Peronospora
Where does powdery meldew comes from?
North America
What’s the agent of downy meldew?
Plasmopara viticola, fungual
When had powdery meldew spread to Europe?
Early 1880s
What’s affected by downy mildew?
The green parts of the plant
How can you recognise downy meldew?
Oil spot on the leaves
> spores germinate a white, cottony growth develops on the underside of the leaves
Downy meldew- what happens with the vine?
green portions of the vine
> leaves drop off the vine
> vine’s ability to photosynthesize is limited
What’s done to prevent against downy meldew?
Bordeaux Mixture, a spray of copper sulfate, water and lime
What happens with downy meldew after a winter?
fungus survives the winter on fallen leaves in the soil, and its spores reach the vine again
Synonym of Eutypa Dieback?
Dead arm
What causes the Eutypa Dieback disease and how is it caused?
Eutypa lata fungus
>Spores are carried by rain and enter the vine through pruning wounds
Where is Eutypa Dieback common?
In Mediterranean climates
What happens if a vine is infected by Eutypa lata fungus?
Infected vines experience stunted shoot growth as the fungus releases toxins, and eventually an infected cane may die—the dead arm
What’s are the consequences of Eutypa Dieback?
Yields drastic lower
Does not devalue the quality
Where does the well known wine “dead arm” comes from, who produces it and which variety is it
Dead Arm Shiraz> beneficial effect on grape quality
McLaren Vale, Australia
d’Arenberg
