G. quadriradiata is an annual herb, 8–62 cm tall. Leaf blades 20–60 × 15–45 mm. Peduncles 5–20 mm. Involucres hemispheric to campanulate, 3–6 mm diameter. Phyllaries deciduous, outer paleae deciduous, broadly elliptic to obovate, 2–3 mm;inner deciduous, linear to lanceolate, 2–3 mm, entire or 2- or 3-lobed, lobes to 1/3 total lengths, blunt. Ray florets (4 or) 5 (to 8);corollas usually white, sometimes pink, laminae 0.9–2.5 × 0.9–2 mm. Disk florets 15–35. Ray achenes 1.5–2 mm;pappus of 6–15 fimbriate scales 0.5–1 mm;pappus absent or of usually 14–20, rarely 1–5, white, lanceolate to oblanceolate, fimbriate, sometimes aristate, scales 0.2–1.7 mm (Flora of North America Editorial Committee, 2014).
Related invasive species
- Galinsoga quadriradiata
Related Farm Practice
- Flora
- Hosts
G. quadriradiata is a fast-growing annual herb with the capacity to invade agricultural and other disturbed areas in most temperate and subtropical regions of the world (Kagima 2000;Vibrans, 2009;Kabuce and Priede, 2010;Madsen and Wersal, 2014). It is highly competitive and can spread quickly, often being the dominant species in a field. It is causing considerable economic impact in cropping systems, greenhouses, gardens and nurseries (Madsen and Wersal, 2014). In Europe, this species is recognized as a significant problem for many growers and farmers, including in commercial greenhouses, and its presence may reduce yields up to 10-50% in fields planted with vegetables and crops (Kabuce and Priede, 2010;Madsen and Wersal, 2014).
G. quadriradiata is considered to be a common weed in several crops of major importance, such as wheat, maize, coffee, cotton, tobacco, sugarbeet, tomato, pepper, potato, beans, onions, cabbages, garlic, citrus, banana, apple, and strawberry. It is also a common weed in gardens, greenhouses, and nurseries (Damalas, 2008;Vibrans, 2009;Kabuce and Priede, 2010;Madsen and Wersal, 2014).