Adequacy of glyphosate doses in the Merremia cissoides (Lam.) Hallier f. control as a function of light intensity in the growth environments

Control of Digitaria insularis (L.) Fedde in eucalyptus forests: shading increases sensitivity to glyphosate applied alone and in a mixture with carfentrazone-ethyl

“…Increased sensitivity in shading to glyphosate applied alone was also observed in Euphorbia heterophylla [20] and Merremia cissoides [21], and the mixture of glyphosate and carfentrazone-ethyl in Macroptilium atropurpureum [66]. Unlike what was observed in the present study, where no increase in the e ciency of carfentrazone-ethyl isolated under shading was found, Santos Júnior [22] found an increase in sa ufenacil e ciency, another protox-inhibiting herbicide, in controlling Commelina benghalensis.…”

“…The mixture of glyphosate with protox-inhibiting herbicides has an additive and synergistic effect on the control of several species of broadleaf and grass weeds [37][38][39]. However, shading can interfere with the herbicide mixture's e ciency since the morphological and physiological plants characteristics [40][41][42][43][44] and herbicides e ciency when applied alone are altered under low light intensity [20][21][22].…”

“…Both products have been used in eucalyptus plantations to control weeds between the rows, even mixed in the tank as an alternative to increasing the control spectrum. In shaded environments, a condition commonly found under the canopies of eucalyptus planted forests [19], some weeds are more sensitive to glyphosate action, such as Euphorbia heterophylla [20] and Merremia cissoides [21] and protox-inhibiting herbicides, such as Commelina benghalensis [22], and can be controlled with lower doses of these products. The herbicides application in lower doses with high control e ciency, as occurs in shading, helps to reduce the negative impacts of these pesticides on the environment, which is currently so questioned by society [23][24][25][26][27][28][29], in addition to reducing production costs.…”

Luminous restriction and chemical control with glyphosate in integrated management of Urochloa brizantha L.

“…The higher sensitivity of U. brizantha and Meghatirsus maximus to glyphosate in an environment with 50% light restriction, compared to plants kept in full sun, was reported Brant et al (2018). The higher sensitivity to glyphosate by weeds grown in shaded environments, compared to plants kept in full sun, was also observed for Commelina benghalensis , Macroptilium atropurpureum (Costa et al, 2020), Cyperus rotundus , Merremia cissoides (Ferreira et al, 2022a), and for Euphorbia heterophylla (Ferreira et al, 2022b) corroborating what was found in the present study. Research, Society and Development, v. 11, n. 17, e177111738758, 2022 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.…”

“…33448/rsd-v11i17.38758 This research study innovates in relation to Brant et al (2018) for testing intermittent shading in simulation of what happens in field conditions with shading by other larger species. Studies on the response of plants to light restriction use the shade of trees in cultivation environments (Santos et al, 2017), or artificial shading with sombrite (Parissi and Koukoura, 2009;Martins et al, 2014, Costa et al, 2020, Brant et al 2018, Ferreira et al, 2022a. However, these two types of light restriction differ in light incidence since, in natural conditions, there is an alternation between direct and diffuse radiation that affects the understory, which does not occur in artificial shading.…”