Ability to Respond Total:14 / 25Ability to Respond = ( Ease of Response + Tools in Place )
Confidence:High
Confidence Notes:
Impact
Spread
Notes
Score
Spread Rate
Rate of spread is low due to biological control agents.
1
Spread Amount
Mainly found in disturbed sites, waste places, roadsides, pastures, fields, rangeland, near riparian areas and in forested areas in the northwestern part of the state.
2
Damage
Notes
Score
Ecological
Some large populations exist in rangelands and riparian areas, but populations by and large are small due to effects of biocontrol agents.
2
Agricultural
Dense infestations can increase soil erosion. May increase productivity among some pasture species. This in turn, may reduce microbial biomass in the soil.
2
Infrastructure
0
Cultural
0
Health
Many Senecio species, including tansy ragwort and common groundsel, contain pyrrolizidine alkaloids and are toxic to humans and livestock when ingested in a single large quantity or in small amounts over several weeks or months.
4
Benefit
Notes
Score
Ecological
0
Agricultural
0
Infrastructure
0
Cultural
0
Health
0
Total
11
Ability to Respond
Ease of Response
Notes
Score
Detection
Erect stature and bright yellow flowers make it easy to detect, although sometimes it can be in more remote areas.
4
Control
Tansy ragwort populations have been reduced dramatically in California and Oregon since the introduction of the cinnabar moth (Tyria jacobaeae) in 1959 and later, the ragwort flea beetle (Longitarsus jacobaeae).
4
Tools in Place
Notes
Score
Entry
CDFA B listed plant with minor restrictions.
1
Control
Some activity through biological control from CDFA.
