Herbicide Mixtures to Control Dayflowers and Drift Effect on Coffee Cultures

Abstract

The dayflower species Commelina benghalensis and C. diffusa are among the main weeds in coffee crops. The purpose of this study was to evaluate the efficacy of herbicides/herbicide mixtures in controlling dayflower species and to evaluate the possible intoxication of coffee cultures, as well as the effect of mixture interactions. Two experiments were conducted, the first one in a 12 x 2 factorial arrangement with 12 herbicides/mixtures (glyphosate, glyphosate + metsulfuron-methyl, glyphosate + flumioxazin, glyphosate + 2.4-D, glyphosate + oxyfluorfen, glyphosate + carfentrazone-ethyl, metsulfuron-methyl, flumioxazin, 2.4-D, oxyfluorfen and carfentrazone-ethyl) and two dayflower species (C. benghalensis and C. diffusa) and the second one, in a 6 x 2 + 1 factorial arrangement, with six herbicides/mixtures (glyphosate, glyphosate + metsulfuron-methyl, glyphosate + flumioxazin, glyphosate + 2.4-D, glyphosate + oxyfluorfen and glyphosate + carfentrazone-ethyl) and two application forms on coffee plants (reaching 1/3 of the coffee canopy and with a protected canopy), plus a control treatment without herbicides. There was tolerance variation within the dayflower species to the tested herbicides. Commelina benghalensis was controlled by glyphosate, 2.4-D, glyphosate + 2.4-D and glyphosate + metsulfuron-methyl, while C. diffusa was controlled by 2.4-D and glyphosate mixtures by + metsulfuron-methyl, glyphosate + oxyfluorfen and glyphosate + flumioxazin. The mixture glyphosate + 2.4-D is effective in controlling dayflower, but it caused intoxication and growth reduction of the coffee. There was antagonism in the mixture glyphosate + carfentrazone-ethyl in controlling both species, as well as for glyphosate + oxyfluorfen and glyphosate + flumioxazin for C. benghalensis.

Coffee Dryer With Dehydrated Air: A Technical and Economic Viability Analysis

“…Drying is a critical step in the postharvest process (Fantazzini et al, 2018;Freitas et al, 2018;Osorio et al, 2016). In this context, the main risks that may arise are biological and chemical, and these may result in a product that is unfit for human consumption (Osorio et al, 2016).…”

CHEMICAL CONTROL STRATEGIES OF Commelina benghalensis IN COFFEE CROP

“…At the height of 10 -15cm, saflufenacil was not effective in the control of Commelina benghalensis, at any dose and period of evaluation. Freitas et al (2018) sowed the vegetative propagation organs of C. benghalensis in plastic vases, which were kept in a greenhouse and 60 days after transplant, the plants were pruned and standardized in 10 cm of height, 30 days after pruning, when the stems reached approximately 25 cm in length, the application of flumioxazin (45 g i.a. ha -1 ) occurred in the post-emergence condition.…”

Antibodies for the Coat Protein of Cotton Leafroll Dwarf Virus Detect Commelina sp. as an Intermediary Host for Cotton Blue Disease

“…Different Commelina species can be found as invasive plants in several cotton-growing regions ( Culpepper et al, 2004 ; Freitas et al, 2018 ). Tolerance to glyphosate has been reported ( Freitas et al, 2018 ), therefore, its incidence tends to increase and be present during the entire cycle in fields formed by GM cotton cultivars tolerant to this herbicide. Commelina sp.…”