Diseases Flashcards
What are Nematodes
Roundworms affecting the size of a plant and reduce the size and efficiency of a root system.
Plant won’t die but suffer matter stress.
Arthropods
Segmented invertebrates with heads Spiders Mites Phylloxera Leafhopper
Powdery mildew
A fungus damaging the green part of the vine.
Young leaves curl and develop dull grey patches.
Sulphur spray prevent, stop and cure the disease.
What is the other name of the powdery mildew
Oidium
Downy mildew
Fungus disease
Lives within vines tissues
Damage green part of the plant, yellow oil spot on surface of the leave, white downy patches on underside
Bordeaux mixture before the rain arrive can prevent
Copper salt prevent
What is peroposnera?
Downy mildew
Eutypa dieback
Known as dead arm
Caused by a fungus called Eutypa lata
Needs mild temp and moisture
Common in SE Australia California SO France
Yield decrease.
Ctl by vineyard hygiene pruning
Infected wood should be removed from vineyard and burnt.
Phomopsis
Fungal disease spread slowly and difficult to eradicate once infected.
Large decrease in yield
Berry symptoms are rare
Leaf symptoms are common in USA small darks spots after rainfall
Treatment high winter dose of sodium arsenite but dangerous for humans
Pierce’s disease
Bacteria causing a deadly disease of a grape vines.
Spread by glassy winged sharpshooters
No cure available
Not existing in EU, AUS and NZ due to quarantine.
What is Coulure?
happening in June during flowering
it is the dropping off of the infant flowers or berries, which fail to set normally.
Not affecting the quality but decrease the yield.
What is Bouillie Bordelaise?
Bordeaux Mixture, copper sulphate blended with Lime.
What is Millerandage?
The failure of berries to develop normally.
it happens in a bunch of usually perfectly ripe grapes, resulting on arch/acidic taste if left.
Phylloxera ?
kills vine by attacking the roots.
widespread across the world. The loose eats the root. can be easily transported vineyard to vineyard.
when was Powdery Mildew first noted?
1847 in France
When was the first Phylloxera found?
1963 in France
