Viticulture Flashcards
What is Vin de Liqueur
A style of fortified wine made by adding grape spirit to unfermented grape must
What is Mistelles
It is another term for vin de Liqueur
What is the average annual temperature for viticulture
57F or 14C
What method do they use in vineyard to combat late frosts
Oil stoves also known as smudge pots are placed between vines to heat the air
What is a natural wine
Wines which are made without any addition of yeast
- must be grown organically or biodynamically and should be hand harvested
- no chemicals must be added
- low level of Sulphar Dioxide must be there
- wine must be unfined and unfiltered
What level of SO2 is permitted in natural wine
10mg/l in red
20mg/l in white
What is the official term of natural wine
Vin methode nature
When does Botrytis Cinerea happen
A rot which develops when there are early morning mists, creating humidity and afternoon sunshine
What is other term for Botrytis Cinerea in France, Germany and England
Pourriture in France
Edelfaule in Germany
Noble Rot in England
What are the effects of leaf roll virus and how is it spread
it is spread by infected cuttings and mealy bugs
it decreases yield, delays ripening and reduces the quality of wine
What is Coulure
Non-pollination of some of the blossoms causing grapes to fall of or never develop
How is coulure caused
It is caused by cold or wet weather at flowering time
What is Esca
It is a devastating fungal disease which attacks trunk of the wine and will kill it
Which vines are most susceptible to Esca fungus
10-20 year old wines are highly at risk
Which countries is Esca spreading
Mostly European Vineyards of France, Spain, Italy and Germany
Name other fungal diseases which affects the wood of the wine and kill it slowly
Eutypa, Eutypia, Dead arm disease
What is the affect of fan leaf virus on the vine
It causes leaf and shoot to be deformed with poor fruit set and serious reduction in yield
What does Flavescence Doree do to vines
it causes the leaf to curl and turn yellow or red, reduce yield and might kill young vines
How is Flavescence Doree Spread
A bacterial disease spread by Leafhoppers
What is Millerandage
A result of cold or wet weather which affects flowering resulting in poor fruit set which prevents some berries from developing. Therefore will have uneven sizes of grapes
What is Nematodes
minute round worms which feed on the roots of the vine and damage them.
They are also known to transmit other virus infections
Where did Oidium Tuckerii first originate
USA
What is Oidium Tuckerii
AKA powdery mildew, which attacks the green parts of the vine and develops white spores that have a powdery appearance
How does Oidium Tuckerii damage vine
It causes the grape to split open and fall off while others do not ripen, resulting in highly decreased yield
What is Peronospera
AKA downy mildew, attacks the green parts especially the leaves which makes them fall off.
it reduces photosynthesis causing late ripening, low yields and lower sugar content in the grapes
Where was phylloxera originated from
USA
What is Phylloxera Vastastrix
a small aphid like bug which attacks the roots of the vine and kills vitis vinifera
