To evaluate the efficacy of flumioxazin mixtures with glyphosate and sulfosate used in handling postemergence in citros, an experiment was conducted in Presidente Castelo Branco, PR, in a 3 year old orange orchard, “Pear” variety. The experimental design was randomized blocks with seventeen treatments and four replicates. The evaluated treatments were: flumioxazin (10, 15,20 and 25 g/ha), flumioxazin + glyphosate (l0+960, 15+960, 20+960, 20+ 1920 and 25+960 glha), flurnioxazin + sulfosate (10+960, 15+960, 20+960, 20+ 1920 and 25+960 g/ha), glyphosate […]

Weeds resistant to herbicide inhibitors of the enzyme ACCase present great economic importance throughout the world, due to the wide area infested and limited number of alternative herbicides and/or mechanisms of action availables for their control, This literature review intends to elucidate the mechanisms of weed resistance and of crop tolerance to herbicides inhibitors of ACCase. Weed resistance to ACCase inhibitors is due to alterations in the action site, plant metabolism, and membrane repolarization. Crop tolerance to these herbicides is […]

The objective was to evaluate the efficacy of the herbicide carfentrazone-ethyl in mixture with glyphosate, in the control of weeds in a no tillage system and to evaluate the tolerance of the cotton crop. The experiment was developed in the period from January to March of2001, in the FEP-UNESP in Selvíria, MS, in soil with a loamy texture. The cultivar of cotton used was ‘ITA-90’, with 0.90 m of spacing. The experimental design was randomized block with six treatments and […]

This work had the objective of evaluating the effect of the herbicides alachlor, pendimethalin and trifluralin on the initial growth of peanut plants (Arachis hypogaea L.) under greenhouse conditions for a period of thirty days as well as nodule number and dry weight for sixty days after the sowing period. The experiment was conducted at the Agronomy College of the Federal University ofBahia.The first experimental design was completely randomized with four treatments (control- rate zero; alachlor – 2.90 kg/ha, pendimethalin […]

This experiment had the objective of evaluating the effects of grain sorghum, Saara, DK 860 and Ambar hybrids, associated with the imazamox herbicide, applied at O, 15 and 30 g/ha, on soybean (cv. Conquista) growth planted after sorghum desication. Sorghum straw did not affect soybean plant height, above ground dry matter and grain yield. Node number was reduced by DK 860 and Saara straw while these hybrids promoted 11% increase in 100 seed weight. Imazamox caused a decrease in the […]

This experiment was carried out at Bayer CropScience Experimental Station, in Paulínia, SP, Brazil, in a loamy soil cultivated with potato cv. Monalisa, during the 2002 growing season. The objectives were to evaluate the efficacy of isoxaflutole in weed control, to verify its selectivity to the potato crop and its effect on tubercule yield. The experimental design was a completely randomized block with seven treatments and four replications. The experimental plots consisted offour 7 m rows, with plants spaced in […]

The effects of chlorimuron-ethyl at the rate of 10.0 g/ha applied alone and as tank mixture or in sequence with glyphosate, and diclosulam at the rate of35.2 g/ha plus glyphosate, as tank mixture, were studied for burn-down and residual control of Brachiaria p/antaginea (Link) Hitchc. and Bidens pilosa L. and for their safety to soybean in no-til. The study was conducted during the 2001/2002 growing season at the National Wheat Research Center of Embrapa in Passo Fundo, RS, Brazil, on […]

Euphorbia dentata is a highly competitive and difficult to control weed in soybean crops in the central are a of Buenos Aires Province, Argentina. Development of transgenic soybean resistant to glyphosate (GR) allows exploration of new techniques of chemical weed control, mainly where the herbicides traditionalJy used are inefficient. The objetive of this . research was to evaluate the effectiveness of Euphorbia dentata control with different formulations of glyphosate in soybean GR. The trial was carried out in Azul district, […]

A field experiment was carried out in Itapira, SP, to evaluate the selectivity and efficiency ofthe herbicide flumioxazin alone or in a tank mix with diuron or diclosulam applied in post-ernergence to weed control in cotton cv. Coodetec 40 I,with two different mineral oils. The experimental design was a randomized block with four replications and the foIlowing treatments: flumioxazin (30 g/ha), flumioxazin+diuron (25+800 and 25+ 1,000 g/ha), flumioxazin+diclosulam (25+30 and 25+35 g/ha), MSMA+diuron (1,800+1,000 g/ha) with standard treatrnent and controls […]

The main management problem in the cassava crop in due to interference by weeds, where they bring about root yield reductions. Inexistence of selective postemergence herbicides, makes weed control only possible with preemergence herbicides or through hand hoeing. The objective of this research was to evaluate broadleaf herbicide selectivity when applied postemerg.ence on cassava plants. An experiment was carried out at University of Rio Grande do Sul, Brazil, using 10-liter volume pots, where four cassava cuttings were planted. The experimental […]