Herbicidas e danos físicos em tocos de teca para controle de brotos após o desbaste

Caldeira, Sidney Fernando; Castro, Cibele Kotsubo da Cunha e

doi:10.1590/s0103-84782012001000017

Cited by 2 publications

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References 4 publications

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“…The lowest average necrotic areas were observed in the treatment where the herbicide was applied only in the region of the cutting, being lower to the other treatments at 3, 5, and 7 DAT, with a necrotic area less than 2% (Table 4). On the contrary, picloram application in the cut stem of a woody species (Tectona grandis) showed translocation via phloem, being efficient in controlling future shoots (Caldeira and Castro, 2012), which shows a difference in systemic herbicides about those with less mobility and support the importance of knowing the behavior of the applied herbicide and the target weed. In the present study, the necrotic region resulting from stem application must be related to chlorophyll in the fleabane stem, which has a photosynthetically active area.…”

Section: Resultsmentioning

confidence: 99%

Control and translocation of saflufenacil in fleabane (Conyza spp.) according to plant integrity

Cavichioli

Barbieri

Pigatto

et al. 2021

Rev. Fac. Nac. Agron. Medellín

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Efficient herbicide absorption and translocation, and satisfactory weed control can be affected by the site of herbicide application. However, during harvesting of crops of previous soybean sowing, the cutting process made by harvesters on the fleabane may generate a difficult management in pre sowing of the crop by limiting the leaf area of the absorption of the herbicide. Experiments were conducted to evaluate the control efficiency and translocation potential of saflufenacil in fleabane plants with different leaf and stem conditions. Experiment I was arranged in a 2x10 factorial scheme, with factor A corresponding to leaf integrity, and factor B corresponding to different levels of injury and saflufenacil application. Weed control was evaluated at 7, 14, and 21 days after herbicide treatment (DAT), and dry matter was evaluated at 21 DAT. Experiment II consisted of applying saflufenacil to different fleabane structures, where the percentage of necrotic area was evaluated at 1, 3, 5, and 7 DAT. Fleabane control was higher than 75% in all treatments with saflufenacil application, with greater control in plants previously defoliated. Saflufenacil application on 10 and 20 cm hairy fleabane plants was also efficient in all treatments. Saflufenacil application in old stem showed a larger necrotic area, while application in the site of the cutting resulted in a lower necrotic area. The main pathway for translocation of saflufenacil is via xylem and the stem proved to be the absorption element of the herbicide when leaf area is limited.

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Section: Resultsmentioning

confidence: 99%