The objective ofthis study was to evaluate the efficacy of different formulations oftrifluralin to control grass weeds in soybean (cv. Garimpo) on a Red-Yellow Latossolo, with a sandy texture, in Uberaba, MG, Brazil. The treatments were: trifluran WG (500 g/l) at 750 and 1000 g/ha, trifluralin EC (600 g/I) at 720 g/ha and trifluralin EC (445 g/l) at 667 g/ha, as well as an unweeded and a weeded control. The experimental design was a complete randomized block with four replications. […]

The experiment was conducted in 1999/00, in the FEP-FEIS-UNESP, Selvíria-MS, in soil with a loamy texture. The objective was to evaluate the efficacy ofthe herbicide carfentrazone-ethyl in mixture with glyphosate, for the control ofweeds in a no tillage system, and to evaluate the tolerance ofthe crop. The com used was ‘CO-32’. The experimental design was a randomized block with seven treatments and four replications. The chemical treatments were the following: 2,4-0 (670 g/ ha), flumioxazin (25 g/ha) and carfentrazone-ethyl (15, […]

The major problem with the sugar cane crop is weed competition, especially purple nutsedge which is a very agressive plant. The trial was carried out at Usina São Carlos (a sugar mill), Jaboticabal-Sl’, during the summer period (1999/2000) aiming to study the effect of imazapic herbicide on purple nutsedge control, sprayed at pre and postemergence, alone or in mixture with pendimethalin. The experimental design was randomized blocks with thirteen treatments and four replications. The treatments were: controls (with and without […]

Two experiments were installed under greenhouse conditions at Escola Superior de Agricultura “Luiz de Queiroz”, Piracicaba – SP, Brazil, in order to evaluate the dry biomass production and toxicity due to pre and postemergence herbicides on the perennial cover crop Arachis pintoi. The experiment was conducted in randomized complete blocks with four replicates. The herbicides sprayed in preemergence conditions (one experiment) were trifluralin at 0.25 kg/ha, diuron at 1.5 kgi ha, oxyfluorfen at 0.6 kg/ha, atrazine at 2.0 kg/ha, metolachlor […]

The aim of this study was to find a chemical alternative for the control of C. g/aberrima, a weed that has became a serious problem in sugar cane plantations. The post emergent herbicides tested included: glyphosate, by itself and mixed with carfentrazone or sulfentrazone, metribuzin, 2,4-D + diuron, acetochlor, ametryne and oxyfluorfen mixed with diuron and acetochlor. In preemergence, oxytluorfen mixed with diuron, 2,4-D/picloram, clomazone, imazapyr, carfentrazone and sulfentrazone, tebuthiuron, 2,4-D/picloram, clomazone mixed with imazapyr, and diuron/hexazinone mixed with MSMA […]

The purpose of the experiment was to evaluate the application of carfentrazone herbicide as desiccant on a soybean crop and its effect on soybean seed yield and physiological quality. A randomized complete block design with 10 treatments and 4 replications was set up. The experimental plot consisted of 8 rows, each 5 m long. The following treatments were applied to plants of the FT-Jatobá cultivar: I) control, without desiccant; 2) carfentrazone (50 g/ha); 3) carfentrazone (70 g/ ha); 4) carfentrazone […]

An experiment was conducted under field conditions to study the efficacy of the herbicides lactofen, irnazethapyr, chlorimuron-ethyl, cloransulam-metil, oxasulfuron, and flumiclorac-pentil, alone and in combination with lactofen, for E. heterophylla control in soybeans. The E. heterophylla biotype was supposed to be tolerant to herbícides whose mechanísm of action is on ALS enzyme ínhibition. The best treatment in absolute terms was lactofen at 120 g/ha plus Attach 0.2 % as sequential applicatíons. However, lactofen + imazethapyr (120+50 g/ha), lactofen + oxasulfuron […]

A test was conducted in Chapadão do Céu city, state ofGoiás, to evaluate the biological efficacy ofa tank mixture of glyphosate + carfentrazone-ethyl, comparing it with glyphosate + 2,4-0 on the desiccation ofweeds in a soybean plantation. The experimental design adopted was that ofrandom blocks, with four replications and nine treatments, as follows: glyphosate (720 and 1080 g/ha), glyphosate + 2,4 -O (720+670 and 1080+402 g/ha), glyphosate + carfentrazone-ethyl (360+30, 720 + 25 and 1080 + 20 g/haj.and 2,4-D (670 […]

A trial was carried out on Bela Vista Farm, Serranópolis (GO), to evaluate the efficiency and selectiveness ofherbicide combinations applied in preemergence for soybean cv. Rainha. The treatments used were: metalochlor+diclosulam (2400+35 g/ha), sulfentrazone+diclosulam (250+25, 300+20, 350+ 15 and 200+35 g/ha), clomazone+diclosulam (504+25, 720+25, 828+25, 504+30, 720+30 and 828+30 g/ha), as well as an untreated control. It was concluded that the herbicide mixtures were selective for soybean cv. Rainha. Sulfentrazone+diclosulam and clomazone+diclosulam, independently ofthe dose used showed an efficient control […]

One obstacle to sunflower production is weed competition. A limited number of herbicides have been registered for this crop in Brazil and the lack ofwide spectrum broadleafweed control herbicides increases the need for other weed control methods. A field experiment was conducted at Embrapa Soja, Londrina county, Paraná State, Brazil, to evaluate sunflower tolerance to preemergence herbicides. The treatments were acetochlor+oxyfluorfen (1536+240 g/ha), oxyfluorfen (360 g/ha), oxyfluorfen (240 g/ha), Iinuron (1000 g/ha), aclonifen (1800 g/ha), oxadiargil (800 g/ha), diflufenican (25 […]