Communications in Plant Sciences, vol 5, issues 3-4, p.45-49, 2015
Full title: Spray temperature and spray volume influence on the efficacy of carfentrazone-ethyl and saflufenacil to control morning-glory
Authors: Mauricio Crestani Agostineto, Humberto Henrique Ansolin, and Leonardo Bianco de Carvalho
Abstract: The objective of this research was to relate the response of Ipomoea hederifolia and Ipomoea quamoclit with the variation of spray temperature and spray volume of carfentrazone-ethyl and saflufenacil. Two pot-experiments were carried out to relate the spray temperatures (10, 20, and 30 oC) and spray volumes (150, 200, and 250 L ha-1) with the plant dry mass accumulation after application of 2 mL ha-1 and 0.5 g ha-1 of the labeled herbicide with carfentrazone-ethyl (Aurora®) and saflufenacil (Heat®). Fourteen days after application, shoot dry mass was determined. Data were expressed in relation to the herbicide-free check and submitted to linear regression analysis. Increasing 10 L ha-1 in spray volume reduces 1.34% of the dry mass of both species, by using carfentrazone-ethyl, and 2.32% and 1.93% of the dry mass of I. hederifolia and I. quamoclit, respectively, by using saflufencil. In addition, increasing 1 oC in spray temperature reduces 0.22% and 0.35% of the dry mass of I. hederifolia and I. quamoclit, respectively, by using carfentrazone-ethyl, and 0.56% and 0.30% of those species, respectively, by using saflufenacil. The efficacy of carfentrazone-ethyl and saflufenacil to control I. hederifolia and I. quamoclit is dependent on both spray temperature and spray volume. The use of spray temperature next to 30 oC and spray volume next to 250 L ha-1 can provide a better control of those species.
Keywords: PPO inhibitors, herbicides, spray characteristics.