Fungicidal Activity of Some Common Weed Extracts Against Different Plant Pathogenic Fungi

Aqueous extract effects of 64 weed species on growth and development of .4tternaria soiani Sorauer. Hetminthosporium sativum King & Bakke and Rhizoctonia .wlani Kuhn. plant pathogenic fungi were studied In vitro. Extracts varied in the strength and persistence of their antifungal effects against the three fungi species. Some stimulated, others inhibited or had no effect. Among all species tested, extracts of Chenopodium murale, Falcaria vulgaris. Ranunculus asialieus and Sisymbrium irio were the most toxic to A. solani. Anagallis arvensis. .4triple\ ieucoclada, Crepls aspera, Noiobasis syriaca. R. asiaticus, Rumcx crispus, S. irio. Sonchus oleraceous and Vicia narbonensis to H. sativum and R. asiaticus, S. oleraceous and Mercurialis annua to R .soiani. However, R. a.siaticus extract was the most effective and completely inhibited growth and sporulation ofthe three fungi species at ali incubation periods