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Flashcards in Lecture 3 Deck (27)
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1

What are Vascular Wilts?

Diseases of the water conduction tissues. (Xylem) 

2

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 

3

 

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.  

4

What was the disease we saw on the branch that Buckley brought in? 

Verticillium Wilt

5

What are the symptoms of Verticillium WIlt?

Flagging and Streaking

 

6

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.  

7

Does Verticillium WIlt affect the whole tree at the same time?

No, its typically one sided. 

8

9

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)

10

Who are the Vectors for Dutch Elm Disease?

 

  • Native elm bark beetle
  • European ekm bark beetle

11

What should you look for when considering Dutch Elm Disease? 

  • Flagging Branches
  • Streaking in the Cambien tissue

12

Does Dutch Elm Disease attack the whole tree at once? 

Yes, it will travel throughout the xylem and phloem. 

13

Besides insects, what's another way for Dutch Elm Disease can spread? 

Root Grafting 

14

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 

15

What is the best fungicide product to use to manage Dutch Elm Disease?

Alamo

16

What bacterium is the cause of Bacterial Leaf Scorch?

Xylella fastidiosa

17

Bacterial Leaf Scorch Vectors:

  • Tree Hoppers
  • Leaf Hoppers

18

How does the bacteria Xylella affect its host? 

Forms biofilms in the xylem that block the flow of fluids. 

19

Pre-Emergant damping off means:

The fungus killed the seed or seedling before it germinated. 

20

post-emergent damping off means: 

It came out of the ground, and it killed the seedling, after it germinated. 

21

22

what root rot fungus can move into the plant through both the roots and through plant tissue?

Rhizoctonia

23

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

24

How does Shoestring Root Rot access its host?

It gets in through mechnical Damage or in the "butt" of the tree

25

what does Phytopthora mean?

  • Means "Plant Destroyer" 

26

Phytopthora can cause bleeding cankers in the bak of trees. 

True or False?

True

27