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Strategies to control coffee leaf rust with the application of protective and systemic fungicide in Vicosa, Minas Gerais, Brazil : Estrategias de control de la roya del cafeto con la aplicación de fungicida protector y sistémico en Vicosa, Minas Gerais, Brasil :

by Silva Acuña, R; Zambolim, L; Alvarez Venegas, V.H.
Publisher: 2002ISSN: 1316-3361.Subject(s): COFFEA | COFFEA ARABICA | HEMILEIA VASTATRIX | INSECTA | PERILEUCOPTERA COFFEELLA | CONTROL QUIMICO | COBRE | DISULFOTON | FORMULACIONES | ENFERMEDADES FUNGOSAS | FUNGICIDAS | CONTROL DE INSECTOS | INSECTOS DAÑINOS | INSECTICIDAS | CONTROL DE INSECTOS | CONTROL DE ENFERMEDADES | ENFERMEDADES DE LAS PLANTAS | ORGANISMOS PATOGENOS | PLAGAS DE PLANTAS | TRIADIMENOL | BRASIL In: Bioagro (Venezuela) v. 14(2) p. 85-97Summary: An experiment was conducted at Teixeiras, state of Minas Gerais, Brazil, to determine the alternative of using copper oxychloride 50Summary: and triadimenol 6 GR to control coffee leaf rust (Hemileia vastatrix) and evaluate the use of different doses of triadimenol+disulfoton. In the first cycle, the use of the cupric fungicide protected the crop with more efficiency than the formulations of the systemic one, and in the following two cycles it was detected effectiveness of the treatment of four sprays between December and March. The effectiveness of the dose of 0.72 kg/ha of triadimenol during the first cycle was detected. In the next cycle the defoliation caused by Perileucoptera coffeella implied low levels of the disease, not attributed to efficiency ofthe fungicide. Due to the effect of biannual production, in the third cycle the best control was reached with the dose of 0.72 kg/ha of triadimenol. There was not effect of the dose on yield. The treatments with triadimenol+disulfoton resulted in the lower levels of the disease and high yields. The gradual decrease of the dose until reaching the current recommendations did not affect the control of the disease, although in the second cycle decreased the production in the treatment with reapplication of the initial dose. In the third cycle, when the dose was decreased to 1/4 of the initial, differences were not found in control of the disease or coffee production.
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An experiment was conducted at Teixeiras, state of Minas Gerais, Brazil, to determine the alternative of using copper oxychloride 50

and triadimenol 6 GR to control coffee leaf rust (Hemileia vastatrix) and evaluate the use of different doses of triadimenol+disulfoton. In the first cycle, the use of the cupric fungicide protected the crop with more efficiency than the formulations of the systemic one, and in the following two cycles it was detected effectiveness of the treatment of four sprays between December and March. The effectiveness of the dose of 0.72 kg/ha of triadimenol during the first cycle was detected. In the next cycle the defoliation caused by Perileucoptera coffeella implied low levels of the disease, not attributed to efficiency ofthe fungicide. Due to the effect of biannual production, in the third cycle the best control was reached with the dose of 0.72 kg/ha of triadimenol. There was not effect of the dose on yield. The treatments with triadimenol+disulfoton resulted in the lower levels of the disease and high yields. The gradual decrease of the dose until reaching the current recommendations did not affect the control of the disease, although in the second cycle decreased the production in the treatment with reapplication of the initial dose. In the third cycle, when the dose was decreased to 1/4 of the initial, differences were not found in control of the disease or coffee production.

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