Diseases Flashcards
Name the common fungal diseases
Powdery Mildew Downy Mildew Eutypa Dieback Esca Black Rot Bunch Rot
Name the common bacterial diseases.
Pierce’s Disease
Crown Gall (Black Knot)
Bacterial Blight
Name the Viral diseases.
Leafroll Virus
Fanleaf degeneration
Name the most common Phytoplasma Disease.
Flavescence Doree
What is Powdery Mildew?
It affects the green parts of the leaf and survives in hot, arid climates.
What is Downy Mildew?
It does not survive in hot, arid climates. Can be cured with the “Bordeaux Mixture” copper sulfate, water and lime.
What is Eutypa Dieback?
It is a bacterial disease - dead arm. Enters the pruning wound. Very common in Medditerean climates. Kills the cordon. Infects numerous vines symoltaneously.
What is the fungal disease Esca?
Result of a complex of fungi. Causes the inside of the vine to rot. Romans used to love trees with it because they caught fire quickly.
Black Rot?
Fungal disease, black spots on the vine’s leaves and can be controlled with the use of fungal spray. It’s an american import disease.
What is the fungal disease bunch rot?
Includes Botrytis Cinerea
What is the bacterial diesease Pierce’s Disease?
It is carried by a glass-winged sharpshooter. A scourge, preventing the vine to produce Chlorophyll. Kills in 1-5 years.
What is the Crown Gall disease?
A bacterial disease, also known as Black Knot. The disease causes big tumors on the trunk of the vine causing strangulation.
What is Bacterial Blight?
Often kills young grapevines. is spread through unclean pruning tools. Can be controlled by hot water an the bordeaux mixture.
What is the leafroll virus?
Caused by a complex of at least nine different virus’s and causes 60% of vine loos around the world. Currently incurable. causes vibrant colors in the fall with the downturning at the edges of the leaves.
What is Fanleaf degenration?
Caused by a nepovirus spread by soil nematodes that feed on the roots. Vine must be removed. Characterized by yellow vines in the green leaves.
What is Flavescence Doree?
It is a phytoplasma Disease. Leafhopper insects spread the disease. Delay bud break and slow shoot growth. Leaves will discolor. Currently there is no cure.
What kind of fementations do small vessels lead to?
longer, cooler ferments. Larger vessels hotter, shorter ferments.
What is the living range temperature wise for yeasts?
50 degrees F to 113 degrees
What is a culprit of Volatile acidity in the end product of a wine?
Trace presence of Acetaldehyde left in the new wine will inevitably be converted into acetic acid which then comes in contact with alcohol and is converted to ethyl acetate a culprit of volatile acidity.
