A study was undertaken to assess the phytotoxicity of citronellal, an oxygenated monoterpenoid with an aldehyde group, towards some weedy species [Ageratum conyzoides L., Chenopodium album L., Parthenium hysterophorus L., Malvastrum coromandelianum (L.), Garcke, Cassia occidentalis L. and Phalaris
Phalaris paradoxa (hood canarygrass) is one of the most abundant weeds in wheat fields of Iran. In a survey conducted from 2005 to 2007 in Ilam (Dehloran City) and Golestan (Gorgan City) provinces, leaf blotch symptoms were prevalent on P. paradoxa. Initial symptoms were pale brown and necrotic
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