Ability to Respond Total:8 / 25Ability to Respond = ( Ease of Response + Tools in Place )
Confidence:Medium
Confidence Notes:
Impact
Spread
Notes
Score
Spread Rate
Needs walnut twig beetle as a vector of the fungus. Currently found in many western states including parts of California.
4
Spread Amount
Large die-offs of walnut in west, primarily in black walnut.
5
Damage
Notes
Score
Ecological
Affects native walnuts.
2
Agricultural
Over a period of time will kill walnut trees on black walnut rootstock.
3
Infrastructure
0
Cultural
Effect on home trees.
2
Health
0
Benefit
Notes
Score
Ecological
0
Agricultural
0
Infrastructure
0
Cultural
0
Health
0
Total
16
Ability to Respond
Ease of Response
Notes
Score
Detection
Recently described disease (it hasn't been named to species yet), especially bad cases in New Mexico.
1
Control
The walnut twig beetle has been found in spreading in western states in the last 12 years. Confirmed populations of vector in Los Angeles, Riverside, Butte, Yolo, Fresno, Tulare counties.
2
Tools in Place
Notes
Score
Entry
Occurs in California in isolated areas of the Central Valley and Southern Calif. The beetle is spreading and bringing the disease with it.
1
Control
No known treatments. Hard to control fungus in chamber of the beetle.
