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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 o C) 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 o C in spray temperature reduces 0.22% and 0.35% of the dry mass of I. hederifolia and I. quamoclit, respectively, by using carfentrazoneethyl, 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 o C and spray volume next to 250 L ha -1 can provide a better control of those species.

Spray temperature and spray volume influence on the efficacy of carfentrazone-ethyl and saflufenacil to control morning-glory