Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic rhinitis. It is often confused with ragweed, which does cause pollen allergies. A single ragweed plant can generate a million grains of pollen per day. Species of "Ambrosia" (ragweed) produce large quantities of pollen. They'll glean the seeds of grass, dandelions, chickweed, sunflowers and ragweed. Examples include grasses, birch trees, ragweed and maples. Manually uprooting ragweed is generally ineffective, and skin contact can cause allergic reaction. This prevented late-season ragweed infestations in the stubble. Migrating sparrows may be attracted to marsh elder ("Iva annua") and giant ragweed ("Ambrosia trifida"). Ocax only manages to scratch Poppy's nose, but he kills and eats Ragweed. "I Believe You" have been recorded by the Oklahoma red dirt band Cross Canadian Ragweed. Cross Canadian Ragweed was an American rock band formed in Yukon, Oklahoma in 1994. Common culprits are common ragweed ("A. artemisiifolia") and great ragweed ("A. trifida"). The distribution of common ragweed in Europe is expected to expand northwards in the future. In May 2010, Cross Canadian Ragweed announced a hiatus from touring.