PLP407 Lecture 17
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- Briefly describe a plant pathogenic virus and the symtoms it might cause.
- A plant pathogenic virus is composed of single stranded RNA and a protein case that might be sepherical or rod shaped. These can cause leaf rings
- List three ways viruses can be transmited.
- #1 is by aphids nomatodes infected pollenation plant propegation
- Name an important plant virus in MI and why its of economical importance.
- Rose mosaic and plum pox. Its important because its regulated.
- In lecture we looked at a graft junction that turned brown/black, a disease known as black line of walnut. Explain how a virus can cause a tree to die through a graft union due to incompatability.
- A hypersensitive response occurs where either the stock or the scion or both are infected with a virus and begin to show a resistance by killing healthy cells in order to protect the plant. This eventually causes girdling of the tree.
- What was the source of the tomato spotted wilt virus that affected MI's bedding plant industry in 1989, and how did it spread?
- The source was infected propegation from the south and it was spread by western flower thrip
- What virus is a problem and must be quarentined and eradicated when found?
- Plum Pox virus.
- What is the re occuring source of the plum pox virus?
- Onamental Prunus nursery stock.
- Where would a nursery by non-infested stock for fruit trees?
- University of California in Davis