Lecture 3 Flashcards
(27 cards)
What are Vascular Wilts?
Diseases of the water conduction tissues. (Xylem)
What do Crown adn Root Rot do to the plant?
They cause dysfunction of underground tissues and inhibit water uptake and movement in the plant
What’s the difference between the two Crown and Root Rot pathogens?
- One pathogen is soil-borne and attacks through the roots.
- The other Pathogen is brought to the plant by an insect vector. it attacks the branch through feeding wounds and brreding sites.
What was the disease we saw on the branch that Buckley brought in?
Verticillium Wilt
What are the symptoms of Verticillium WIlt?
Flagging and Streaking
When you have branch dieback…what can you do to see if the plant has Verticillium WIlt?
Peel the bark back and look for the black streaking spores in the cambien tissue.
Does Verticillium WIlt affect the whole tree at the same time?
No, its typically one sided.
Management and Control considerations for Verticillium WIlt:
- • Maintain plant vigor with sound cultural practice
- Remove affected plant material
- Replant with immune species or resistant varieties: (*in notes)
Who are the Vectors for Dutch Elm Disease?
- Native elm bark beetle
- European ekm bark beetle
What should you look for when considering Dutch Elm Disease?
- Flagging Branches
- Streaking in the Cambien tissue
Does Dutch Elm Disease attack the whole tree at once?
Yes, it will travel throughout the xylem and phloem.
Besides insects, what’s another way for Dutch Elm Disease can spread?
Root Grafting
Management and COntrol for Dutch Elm Disease?
• Practice sound horticultural to maintain plant vigor
- Remove and destroy infected plant material
- Monitor vector populations with sticky cards
- Use residual insecticides late in the dormant season • Sever root grafts
- Implement chemotherapy with injectable fungicides • Avoid pure stands of elms
- Choose disease-resistant cultivars
What is the best fungicide product to use to manage Dutch Elm Disease?
Alamo
What bacterium is the cause of Bacterial Leaf Scorch?
Xylella fastidiosa
Bacterial Leaf Scorch Vectors:
- Tree Hoppers
- Leaf Hoppers
How does the bacteria Xylella affect its host?
Forms biofilms in the xylem that block the flow of fluids.
Pre-Emergant damping off means:
The fungus killed the seed or seedling before it germinated.
post-emergent damping off means:
It came out of the ground, and it killed the seedling, after it germinated.
what root rot fungus can move into the plant through both the roots and through plant tissue?
Rhizoctonia
How would you approach crown and root rot problems in an ornamental bed?
- • Exclude the disease with vigorous sanitation
- • Eradicate affected plant material
- • Maintain resistance with sound horticulture
- • Protect the plants with regular fungicide applications
- BanRot - Combination fungicide
- or Mix Compass & Subdue Maxx
How does Shoestring Root Rot access its host?
It gets in through mechnical Damage or in the “butt” of the tree
