Abstract :
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
