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CHEMICAL CONTROL OF THE ANTHRACNOSE (Colletotrichum graminicola) OF SORGHUM

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Author(s): NICÉSIO FILADELFO JANSSEN DE ALMEIDA PINTO

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 2;
Issue: 3;
Start page: 148;
Date: 2003;
Original page

Keywords: Sorghum bicolor | fungicides | seed health

ABSTRACT
The following fungicides (g a. i. ha-1) were applied on the sorghum variety BR 009B: tebuconazole (200), benomyl (500), mancozeb (2400), triforine (285), fenarimol (120), prochloraz (450), imibenconazole (150), azoxystrobin (150), chlorothalonil (1125), captan (750) and carbendazim (350). Plots without fungicide treatment constituted the control. Treatments were laid out in a randomized complete block design (12 treatments in 3 replications) with plots of four rows, 7m long and 2m apart. Applications, in number of three, were performed every 10 days with a costal sprayer. Fungicides were first applied when plants presented a moderate incidence of leaf anthracnose. Anthracnose evaluations were made at the day of the first application and 20 and 45 days later, using a 0 to 5 scale (0 = no symptoms and 5 = dead plants). Seeds were submitted to a seed health test through the deep freezing method, and, for the quantification of the production, the weights of the seeds were adjusted for 13% of humidity. Results showed that the fungicides prochloraz, carbendazim, benomyl and azoxystrobin were the most efficient in the control of leaf anthracnose, as indicated by the anthracnose progress within the 45 days interval of evaluation. The results also evidenced that the smallest incidence of C. graminicola on seeds happened in the treatments with carbendazim, azoxystrobin and prochloraz; and that the largest weights of seeds were obtained with the treatments prochloraz, carbendazim, benomyl and azoxystrobin.
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