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Poaceous weeds are the most troublesome grass weeds in temperate climates, mostly infesting winter cereals, like wheat and barley. The use of mechanical cultivation to eradicate them in fields is ineffective, because of the unequal germination of seeds. Continuous use of herbicides with the same mode of action may lead to the resistance in weeds. Therefore, an investigation was carried out to study the effects of different herbicides viz. Isoproturon, Topik and Puma Super on three weeds of wheat viz. Phalaris minor, Avena fatua and Lolium temulentum, using CRD factorial design with eight replications. The data were recorded on weed density, shoot length, leaves count and mortality rate at three stages viz. 14, 21 and 28 days after herbicides treatment. Fresh biomass yield of weeds was also recorded after 30 days of herbicides treatment. All the parameters were significantly affected over the period of time. Minimum weed density (3.9 plants pot-1 ) was recorded after 28 days of treatment. Comparatively more reduced shoot length, leaves count and fresh biomass weight of weeds were observed under the treatment with Topik (Clodinafop-p). Maximum percent mortality (31.10) was recorded at 21 days after the application of herbicides. For the most effective control of P. minor, A. fatua and L. temulentum weeds of wheat crop, Topik @ 0.37 kg a.i./ha was found the most suitable herbicide applied at 3-4 foliar stage.
K. B. Marwat. (2006) GROWTH DYNAMICS OF POACEOUS WEEDS INFLUENCED BY HERBICIDES WITH DIFFERENT MODES OF ACTION, , Volume 3, Issue 2.
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