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 […]

Two field experiments were carried out in Engenheiro Coelho, SP, to evaluate the selectivity and efficiency of the herbicide propisochlor, alone and in combination with other herbicides, applied in pre and post-emergence in com. A randomized block design was used with four replications inc1uding the following treatments: propisochlor (at 1008, 1080 and 1152 g/ha), propisochlor formulated with atrazine (at 1008/1400, 1080/1400 e 1152/1400 g/ha), and with terbutylazine in tank rnix (at 1008+1800, 1080+ 1800e 1152+ 1800 g/ha), acetochlor at 2688 […]

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 […]

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 […]

The aim of this work was to evaluate the selectivity and the efficacy of ac1onifen, isolated or in mixture with other herbicides, in postemergence weed control in a sunflower crop. The experiment was conducted in 1998/99, at the Experimental Farm ofMaringá State University, Paraná State, using the hybrid Morgan 742. The experimental design was randomized block with nine treatrnents and four replications. The evaluated treatments were: control (with and without hoeing), aclonifen (780 and 900 g/ha), quizalofop-p-ethy (75 g/ha), aclonifen […]

This study was carried out to analyze the use, in total area, of different doses of glyphosate in guariroba crop to control Brachiaria decumbens in post-emergence. The commercial product Roundup Transorb (648 g of glyphosate 1L) was applied at the doses of: 972,1215,1458,1701 and 1944 g/ha. The experimental design was arandom blocks, with four repetitions. The volume of solution applied was 2001 L/ha, at a temperature of26°C and relative humidity of 84%, by the use of a manual sprayer, pressured […]

The tolerance of the com crop to the herbicide cyanazine depends on the growth stage of the crop. An experiment was conducted in Eldorado do Sul, RS, Brazil, to evaluate the selectivity of cyanazine applied at different rates on com, and at different growth stages, to estimate the economic impact of crop injury caused by the herbicide. The com hybrid AG 501 was planted on a no-till system where the weed control was performed with preemergence herbicides. Treatments tested were […]

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 […]

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 […]

Experiments were carried out with the objective of evaluating the weed management in com, spraying the herbicide sulfentrazone in pre-emergence conditions, alone or in combination with acetochlor and carfentrazone-ethyl herbicides in post-emergence conditions alone or in tank mix either with atrazine or nicosulfuron. The experiments were in completely randomized block design, with four replicates, in Piracicaba 1 SP, Brazil, in the experimental area of the Crop Production Department from University of São Paulo – ESALQ/USP. The weed control and the […]

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 […]

Weeds are the most important causes for soybean yield losses. Alexandergrass (Brachiaria plantaginea (Link) Hitchc.) is the main grass weed in the soybean crop in the southern region of Brazil. Chemical control has been intensively used to reduce the impact of this weed on soybean. However, the selection pressure imposed by agricultural weed control resulted in several biotypes of Alexandergrass resistant to ACCase-inhibiting herbicides. The proposal of a weed management system that prevents the development of resistence can be complex, […]