St. Barnaby’s thistle (yellow starthistle)
Centaurea solstitialis
Yellow starthistle is a gray-green to blue-green plant with a deep, vigorous taproot. It produces bright, thistlelike yellow flowers with sharp spines surrounding the base. Yellow starthistle grows to heights varying from 6 inches to 5 feet. The stems of mature plants are rigid, spreading, and typically branching from the base in open areas. Stems and leaves are covered with a loose, cottony wool that gives them a whitish appearance. Stems appear winged due to leaf bases that extend beyond the nodes. Basal leaves are 2 to 3 inches long and deeply lobed. Upper leaves are short (0.5 to 1 inch long) and narrow with few lobes.
Pesticides
Alion
intensity: ★★★
Clearview
intensity: ★★★
GF-871
intensity: ★★★
GF2050
intensity: ★★★
Indaziflam 200 SC
intensity: ★★★
Indaziflam 500 SC
intensity: ★★★
Milestone
intensity: ★★★
Navius
intensity: ★★★
Navius VM
intensity: ★★★
Restore II
intensity: ★★★
Sightline A
intensity: ★★★
Truvist
intensity: ★★★
Reclaim II A
intensity: N/A
Reclaim II B
intensity: N/A