The objective of this study was to evaluate the effects of application of glyphosate and paraquat compared to mowing to control invasive grasses in degraded areas. For the present study, the area was divided into two areas with different values of penetration resistance of soil and the fresh weight of the shoots. In each environment were selected five plots of 6×6 m². Each plot was divided into four subplots receiving treatments: glyphosate (1,44 kg ha-1), paraquat (0,40 kg ha-1), mowing […]

The objective of this study was to evaluate the efficacy in herbicides control applied in Crotalaria spectabilis and Crotalaria ochroleuca adult plants. Three experiments were installed with seven herbicides arranged in a randomized block design with four repetitions. It was realized visual evaluations of control at 3, 7, 14, 21, 35 and 42 after applications (DAA), and regrowth at 21, 28, 35 and 42 (DAA). It was concluded that treatment with sequential application of glyphosate(1,550 + 1,860 g ha-1) provided […]

Macroptilium lathyroides (wild bushbean) specie was found infesting relatively large areas of soybeans in the southern region of Mato Grosso do Sul State, Brazil, where farmers complained about lack of herbicides efficiency in controlling this species. There is no herbicide registered for controlling this species in Brazil, and the amount of researches involving its susceptibility to several actives principles is so limited. This study aimed to verify the efficiency of glyphosate herbicide, isolated or in association with other actives principles, […]

Some species of Amaranthus are widely distributed in cotton crops. In recent years, ineffective weed control after herbicide use of some species has been reported. The current study was installed in order to find effective alternatives to a proper management of these species. Two simultaneous experiments were carried out for each species in this study (Amaranthus lividus and Amaranthus hybridus), and in each of them, a different stage of weed development (2 to 4 and 4 to 6 leaves) was […]

The objective of the work was to evaluate the selectivity and efficiency of amicarbazone herbicide in pre-emergency, in controlling Ipomoeas species in sugarcane crop. The experiment was developed between November, 2005 to November, 2006, in Santa Terezinha Farm, Pereira Barreto County, São Paulo State, cultivated by Pioneiros Bioenergia Company. The soil of the area is classified as LVE sandy texture. The experiment was developed in area of sugarcane crop of second year (first cut), with RB 86-5486 genotype and spacing […]

The present study aimed to verify the effectiveness of saflufenacil herbicide in post-emergence weeds control. Saflufenacil herbicide was applied over Luffa aegyptia, Merremia cissoides, Mucuna aterrima and Ricinus communis weeds, when the plants contained the second pair of true leaves at 0x, 0.25x, 0.5x, 1x, 2x, 4x, 8x with the last one the commercial recommended dose (50 g a.i. ha-1). The evaluations of control and plants canopy dry matter mass were conducted at 28 days after treatments application. The experimental design […]

This research aimed to evaluate the efficacy of herbicides associated with sugarcane straw on the control of Ipomoea triloba and Urochloa decumbens after simulation of different time periods of rain. Two experiments were conducted in greenhouse in pots filled with soil, being placed on them the equivalent of 0, 5 and 10 t ha-1 of sugarcane straw, after  weed species sowing. The herbicides mesotrione, formulated mixture of [hexazinone+diuron] and imazapic were applied in pre-emergence on the pots with or without […]

In recent years some species of Solanaceae has appeared more frequently infesting cotton crops. Information on the management of these species are still scarce in this culture. In order to seek effective alternatives in the management of these weeds was installed this work. The experiments were conducted in green-house and installed two for each species evaluated (Nicandra physaloides Gaertn e Solanum americanum Mill.), varying the stage of application (2 to 4 and 4 to 6 true leaves). The treatments were […]

The potential yield of corn may be affected by weed interference. The aim of this research was evaluate the chemical control of weed in fields of corn (BRS 1035), with sub lethal rates of nicosulfuron associated with atrazine in order to reduce doses without lose large spectrum of action in the control of weed community. The herbicides treatments were: nicosulfuron at 20, 40 e 60 g ha-1, nicosulfuron + atrazine at 20 + 1000 and 40 + 1000 g ha-1 […]

The presence of Bidens pilosa and Euphorbia heterophylla resistant to ALS inhibitors is a problem to weed management in cotton crop, due to the fact that few alternatives broadleaf selective herbicides area available. In order to supply this information gap, four experiments were established in greenhouse conditions with the objective of evaluating herbicides applied in post-emergence conditions, recommended either for conventional and transgenic cotton (resistant to glyphosate and amonio-glufosinate) for controlling these resistant biotypes. The experimental design was entirely randomized […]