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Poster: Biology & Disease Mgmt: Biological Control


Integration between 2,4-DAPG-producing Pseudomonas and fluquinconazole to control take-all disease of wheat in Chile.
E. MOYA ELIZONDO (1), C. Vera (1), R. Madariaga Burrows (2) (1) Universidad de Concepción, Chile; (2) Instituto de Investigaciones Agropecuarias, INIA Quilamapu, Chile

Take-all disease of wheat, caused by the fungus Gaeumannomyces graminis var. tritici (Ggt) could be controlled by integrating fungicide seed treatments with 2,4-Diacetylphloroglucinol-producing Pseudomonas spp. (2,4-DAPG). This research assessed the effect on yield parameters and disease damage associated with the integrated use of seed treatments with two Chilean 2,4-DAPG-producing Pseudomonas spp. (106 ufc/g grain seeds) and the triazole fungicide fluquinconazole (1.8 mL/g grain seeds). A field experiment was established in Chillán, Chile, during crop season 2015. Experimental field plots of 2.4 m2 with winter wheat cv. Maxwell were seeded to assess combinations with or without the mentioned seed treatments, plus two untreated control (infested or non-infested with Ggt) on a randomized block design. Seed treatments where both strains of Pseudomonas were mixed with the fungicide reduced plant and root rot disease severity damage (50 and 49%, respectively) and white heads (32%), while increased yield (34%) and grain quality (2.1%) with respect to the Ggt infested control (P≤0.05). Single use of bacterial seed treatments without the fungicide was not different from this control (P≥0.05). Fluquinconazole alone had a lower grain yield (13%) and wheat test weight (1.4%) than when it was mixed with the two bacterial strains. Results suggest that integration of 2,4-DAPG-producing Pseudomonas with fungicides could reduce take-all disease and increase yield in wheat crops.