Ability to Respond Total:14 / 25Ability to Respond = ( Ease of Response + Tools in Place )
Confidence:High
Confidence Notes:
Impact
Spread
Notes
Score
Spread Rate
Aggressively spreading locally in Southern California. Forms dense patches. In other parts to the world it is an aggressive invader, smothers native plants and is allelopathic.
5
Spread Amount
Moderate spread, while populations increase rapidly, they are generally limited to wetter areas. Globally distributed to semi-arid, semi-tropical and tropical areas. Moderately large parts of CA may not be suitable habitat.
3
Damage
Notes
Score
Ecological
Santa Maria feverfew is allopathic, forms dense stands can crows out native vegetation and become the dominant vegetation in an area. Can cause significant and possibly irreversible habitat changes.
5
Agricultural
The weed can lower productivity and yield, and can become a dominant weed in agricultural systems increasing production costs. Is toxic to livestock. Can reduce crop yields by more than 50%. Host of various pests.
5
Infrastructure
0
Cultural
0
Health
Toxic to livestock and can cause severe problems in humans. Causes respiratory issues, allergies, dermatitis, bronchitis and others.
4
Benefit
Notes
Score
Ecological
0
Agricultural
0
Infrastructure
0
Cultural
0
Health
0
Total
22
Ability to Respond
Ease of Response
Notes
Score
Detection
Moderately difficult to detect. Plants are annual but tall and shrubby which make then easy to see, however to correctly identify the plant it must be observed close up. Flowers are distinct aiding in identification once detected. Grows in disturbed areas.
2
Control
Reports globally are that the weed is difficult to control. In Southern California it is spreading aggressively even after repeated control efforts.
1
Tools in Place
Notes
Score
Entry
A-rated weed, but seeds are difficult to detect.
4
Control
A-rated weed. On noxious weed list (4500 list)
5
Outreach
Some outreach in affected parts of Southern California.
