The objective of this work was to evaluate the effect of different treatments with pre-emergent herbicides on the emergence, survival and initial growth of seedlings of tree species from riparian forests. The experiment was conducted in a greenhouse in a randomized blocks design with four replicates and five treatments. The herbicides used were imazapyr, atrazine, acetochlor and oxyfluorfen at the rates of 3,0L p.c./ha, 5,0L p.c./ha, 3,0L p.c./ha e 4,5L p.c./ha, respectively, plus a control treatment (no herbicide). Acetochlor showed […]

Two field assays were carried out aiming to evaluate the rain effects on the glyphosate herbicide activity, applied at different concentrations, under two growing seasons (winter and summer). The experiments were conducted at the FCAV / UNESP Experimental Station, during 2000/01. The winter experiment was installed from June to August of 2000 and the summer one was installed from January to March of 2001. The treatments were glyphosate (0,5; 1,0; 2,0 e 4,0%), used as check treatment. In the field, […]

The objective of this research was to evaluate the efficiency in control of purslane (Commelina benghalensis) with mixtures of glyphosate potassium and butafenacil herbicides on coffee crop in February and May. Two experiments were carried out on Bom Retiro Farm, Vera Cruz-SP, Brazil. The treatments were: post emergence application of glyphosate potassium + butafenacil (100 g i.a./L) (1000+30; 1000+40; 1000+50; 1000+60; 1000+70; 1000+80; 1000+90; 1000+100 g/ha + mineral oil, 0,5% v/v), glyphosate + carfentrazone-ethyl (2000+30 g/ha + mineral oil, 0,5% […]

Aiming at the control of the Brachiaria decumbens in degraded pastures of the Coast-Cross and Tifton 85 hybrids (Cynodon dactylon), two experiments were carried out, each one for each forage, where increasing doses of the commercial mixture diuron/ MSMA and one dose of MSMA were applied. The randomized block experimental design was used with seven treatments and four replicates. The plots were 6m long and 4m wide. The treatments were applied on the total area and on mature weeds. The […]

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 […]

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, […]

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 […]

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 […]

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 […]