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POSTERS: Biological control

Influence of biological agents on the production of Magnaporthe oryzae´s conidia in upland rice, under field conditions.
Marta Cristina De Filipi - EMBRAPA-CNPAF. Valacia Lemes Da Silva Lobo- EMBRAPA-CNPAF, Karolline G Vilela Rezende- Universidade Federal de Goias, Gustavo Andrade Bezerra- Universidade federal de Goias, Marina Arriel-Elias- Universidade Federal de Goiás, Gabriel Arriel- UniEvangélica

The inclusion of a biological agent in the integrated management of rice blast (Magnaporthe oryzae) enables to suppress disease severity, protect and promote the expression of host genetic resistance and reduce the number of fungicide applications. We compared leaf blast severity (LBS) suppression by Burkholderia pyrrocini (BRM 32113), Pseudomonas fluorences (BRM 32111) and tricyclazole, and monitored conidia production in each treatment. In randomized blocks and four replicates, 16 treatments combined the application by seed (TS), spraying at vegetative stage (VS-15 days after planting-dap) and reproductive stage (RS-65 dap). We evaluated LBS at 24, 31, 38 and 52 (dap) using a scale of notes and conidia production rom the same sampled leaves. All treatments suppressed LBS and decrease conidia production by TS, VS or in combination between TS and VS. BRM 32111 suppressed LBS by 64 and 75% at 24 and 31dap, and decrease conidia production by 92 and 86 %, at 38 and 52 dap, respectively; And triciclazole suppressed by 95 %, at 38 and 52 dap, and decrease conidia production by 95 % at 24 and 31dap, respectively.