Unsuitable weed management is one of the main factors responsible for low mean yield of cassava (Manihot esculenta Crantz) in Brazil. In this crop, mechanical weed control is the most commonly used, due to the lack of registered herbicides for cassava crop. In the search for alternatives to this problem, this work aimed to evaluate the tolerance level of cassavas cultivars to mesotrione herbicide applied in post emergence. A experiment was conducted, in green house conditions, in randomized blocks with […]

Herbicides may cause toxicity to the crop and also negative effects on yield characteristics and industrial quality of sugarcane. This study evaluated the effects ametryn, trifloxysulfuron-sodium, ametryn + trifloxysulfuron-sodium and sulfentrazone herbicides over quality and stalk yield of RB867515, SP801816, SP803280, RB937570 and RB925211 cultivars. The experiment was conducted at the Federal University of Viçosa, Viçosa County, Minas Gerais State. A distinct behavior was observed for the cultivars in the presence of herbicides, both for quality as for the stalk […]

Several studies report herbicide tolerance variations of same species with different genotypes. Thus, this study aimed to evaluate the tolerance of five cassava cultivars to the post-emergence applications of fluazifop-p-butyl, fomesafen and the association of both products. In the first visual assessment of intoxication, the most visible symptoms in cassava plants of poisoning was observed at 7 days after application (DAA), caused by mixture treatment (fomesafen + fluzifop-p-butyl) and fomesafen isolated as well. At the end of the evaluation period […]

The lack of information on herbicides selective for cultivation of physic nut makes it difficult to tame the chemical control of weeds, especially during the initial stage of the crop. Therefore, the objective of this study was to evaluate the selectivity of herbicides applied in post-emergence to the culture of physic nut (Jatropha curcas L.). We used experimental design completely randomized with 16 treatments and 11 repetitions, three herbicides in five doses and a control without herbicide. The doses of […]

Adequate planting depth is one of the most important factors in germination and seedling emergence, thereby ensuring a uniform stand. Thus, this study aimed to evaluate the effect of sowing depth in cotton crop (Delta Opal var.), over diuron, oxyfluorfen, alachlor, clomazone, pendimetalin, S-metalachlor, prometryne and trifluralin herbicides plant toxicity. Evaluations on crop toxicity were carried out at 7, 10, 12, 14, 17, 19, 21, 28 and 35 days after herbicide application (DAA), through EWRC scale and total dry mass […]

This study aimed to evaluate the phytotoxic effects of glyphosate increasing doses in Aspidosperma desmanthum Benth. ex Müll. Arg. young plants. Doses of glyphosate applied one year after planting were: T1 – 86.4, T2 – 172.8, T3 – 345.6 g i.a ha-1 and T4 – check (without application). Evaluations of visual phytointoxication were conducted at 7, 14, 21, 28 and 180 days after application (DAA) of herbicide, in order that in the first and last evaluations measures of trunk diameter […]

This work was aimed to evaluate the selectivity of main herbicides used in sugar cane crop applied in pre or post emergence conditions to common bean (“Jalo” Group – cultivar “Jalo Precoce”). In pre emergence modality the treatments evaluated consisted of: ametryn (2.500 g ha-1), tebuthiuron (800 g ha-1), [hexazinone + diuron] (237.6 + 842.4 g ha-1), metribuzin (1,440 g ha-1), clomazone (800 g ha-1), isoxaflutole (112.5 g ha-1), sulfentrazone (600 g ha-1), imazapic (105 g ha-1), trifluralin (1,800 g […]

This study aimed to evaluate the effects of glyphosate sub doses in genipap (Genipa americana L.) young plants. One year after seedlings planting, three glyphosate sub doses were tested, being: T1 – 86.4, T2 – 172.8 and T3 – 345.6 g i.a. ha-1 and T4 – Check (without application). At 7, 14, 21, 28 and 120 days after herbicide application (DAA) scores were provided for visual phytotoxicity, and in the first and in the last evaluation, measurements of plant height […]

This study aimed to evaluate the effectiveness of herbicides in controlling soybean volunteer plants resistant to glyphosate. The experiment was conducted in field conditions by using randomized complete block design in factorial scheme 6×9, with four replications, with the first factor represented by six soybean genotypes resistant to glyphosate herbicide (BRS Favorita RR® , BRS Valiosa RR® , CD 219 RR® , M-SOY 7908 RR® , P98Y11® and P98R31® ) and the  second factor represented by herbicides sprayed isolated or […]

Two experiments were conducted simultaneously with the objective of evaluating the selectivity of nicosulfuron and chlorimuron-ethyl herbicides, applied in post-emergence at two developmental stages in alfalfa crop. Trials were conducted in greenhouse conditions in randomized entirely design, with five replications, in a 4 x 2 factorial scheme. The factors corresponded to the application of chlorimuron-ethyl herbicide at 0, 7.5, 15 and 30 g ha-1 (Trial 1) and nicosulfuron at doses of 0, 20, 40 and 80 g ha-1 (Trial 2). […]