Objective

Question 1

Latin of virus

Answer 1

poison

Question 2

Effects on vineyards

Answer 2

crop losses

low crop quality

Question 3

Is it an organism?

Answer 3

NO

it is not living

Question 4

What is the 4 major disease complexes?

Answer 4

1. infectious degeneration and decline
2. leafroll
3. Rugose wood
4. Fleck

Question 5

What influence the occurance of virusses?

Answer 5

• climate
• location
• soil type
• cultivar
• previous planted crops
• proximity of other crops and cover crops

Question 6

How can you distinguish form fungal and bacterial diseases?

Answer 6

no lesions on leaves of the vine

Question 7

Describe the physical characteristics of a virus

Answer 7

• realy small parts

- nucleic acid core surroound by a protein layer

Question 8

Describe a Virus

Answer 8

-Extremely small parts (<200 mµ) of entities, agents or
pathogens
- that have a core of nucleic acids that are surround by a protein layer or sheath
-they are of necessity parasites that can only increase in the living cells of a host

Question 9

Describe a virus-like disease

Answer 9

• it cause abnormalities that correspond with those of virus diseases
• pathogens in this case is not virusses bit small bacteria
• these pathogens could also be mycoplasms

Question 10

When do you speak of a virus like disease?

Answer 10

When the pathogen is unknown but the nature of the phenomena is typical of a virus

Question 11

Greek for bacterium

Answer 11

bakterion

Question 12

Describe a bacterium

Answer 12

A unicellular organism with a cell wall, that multiplies via fission