The use of scientific knowledge that make possible the characterization and choice of spray nozzle suitable to control of biological target is a function of application technology. This work aimed to characterize the volumetric distribution, the spacing between nozzles, the diameter and uniformity of droplets produced by spraying nozzle of centrifugal energy and control in post-emergence of I. hederifolia with herbicide diuron + hexazinone (1170 g ha-1 + 330 g ha-1) using spray volumes of 20 and 40 L.ha-1 with […]

The aim of this work was to determine residual activity of ACCase inhibitor herbicides applied at pre-sowing of corn crop. The experimental design was completely randomized blocks with four replications in a split-plot scheme, where the factor time interval (seven and two days prior to corn sowing) was the plot and herbicide treatments were the sub-plot: 1. check without application; 2. tepraloxydim (80 g ha-1); 3. tepraloxydim (100 g ha-1); 4. clethodim (72 g ha-1); 5. clethodim (96 g ha-1); […]

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, […]

Several trials have been carried out for increasing glyphosate efficacy on weed burndown, including the addiction of ammonium sulfate and urea as adjuvants. On a physiological approach, there are explanations to complementary effect of these fertilizers when concomitantly added to herbicide spray solution. Therefore, three experiments were developed in field conditions with the objective of evaluating glyphosate efficacy for burning down different weed species by using solution of nitrogen fertilizers as spraying vehicles. Six treatments were evaluated, as follows: glyphosate […]

The aim of the work was to evaluate the effect of nozzles and pressures on the spray drift from glyphosate + 2,4-D. The nozzles designs and the respective studied pressures were: XR 11002 (150 and 300 kPa), DG 11002 (300 kPa), TT 11002 (300 kPa), AI 11002 (300 kPa) and TXVS-10 (400 kPa). Nylon strings outside the application area (1, 5, 10, 20, 50, 100 and 200 m distance) with four replications and six foam cylinders placed on the boom […]

For cultivars with indeterminate habit, there are no reports of the most appropriate period to conducted burndown in pre-harvest. The study aimed to evaluate the influence of burndown on three different times over physiological and sanitary quality of seeds and agronomic characteristics of SYN-9074 RR cultivar with indeterminate habit, in three areas simultaneously. It was used a randomized complete block design with four replications, and joint analysis were conducted for the three distinct areas. Treatments refer to the application period […]

An experiment was carried out in the eucalyptus area of Capão Bonito in the São Paulo state, Brazil, to evaluated the efficacy of the aerial application of the herbicides sulfentrazone and isoxaflutole using clay granules for weed control in Eucalyptus area. Aerial application of the herbicides sulfentrazone at 500 and 750 g a.i. ha-1 and isoxaflutole at 150 e 225 g a.i. ha-1, was carried out using clay granules with 1,05 g cm-3 density, high absorption capacity (24 ml 100 […]

The aim of this study was evaluate the interaction between adjuvants and spray nozzles Euphorbia heterophylla control with mesotrione. Was held application of the herbicide by three models of spray nozzles (TT 110.02, AI 110.02 and TTI 110.02) and two dosages of mineral and vegetal oil (0.5 and 3.0%). Also was verified the qualitative attributes of nozzles, using a distribution table and a droplet analyzer laser. We evaluated the visual intoxication in plants at 2, 7, 14 and 21 days […]

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 […]

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 […]