title: Letter: Origin of toxicity in parasitised annual ryegrass (Lolium rigidum).
mesh_terms: D000818:Animals; D002645:Chickens; D003352:Corynebacterium; D006168:Guinea Pigs; D009348:Nematoda; D010939:Plant Poisoning / Q000209:etiology*; D010944:Plants / Q000469:parasitology*; D012756:Sheep; D014431:Tylenchoidea