Desempenho de fungicidas no controle de mancha-alvo na cultura da soja.

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Author(s): WRUCK, D. S. M.; RAMOS JUNIOR, E. U.; VERSARI, L. R.

Summary: Resumo: O objetivo desse trabalho foi avaliar a eficiência de fungicidas no controle de manchas foliares na cultura da soja, em condições de campo. O experimento conduzido na área experimental da BS Consultoria Agrícola, Sinop (MT). Os tratamentos fungicidas foram: Carbendazim, Trifloxistrobina + Protioconazol, Piraclostrobina + Epoxiconazol + Fluxapirozade, Piraclostrobina + Fluxapirozade, Bixafen + Protioconazol + Trifloxistrobina, Azoxistrobina + Tebuconazol + Mancozebe, Clorotalonil, Fluxapiroxade + Oxicloreto de Cobre e outros dois tratamentos com doses diferentes de Mancozebe. Utilizou-se o delineamento blocos completos casualizados, com quatro repetições. Cada unidade experimental foi constituída por seis linhas de 6,0 metros (m), espaçadas em 0,50 m. A eficiência de cada produto foi determinada com base na porcentagem de área foliar infectada nos estádios fenológicos R6 e R7. Também avaliou-se a produtividade de grãos (Kg.ha-¹). Os dados foram analisados estatisticamente, sendo as médias das variáveis significativas comparadas pelo teste de Scott Knott, a 5% de probabilidade. A severidade de mancha-alvo foi baixa, porém houve diferença estatística entre os tratamentos, em relação a severidade da doença e desfolha, apesar desta ter sido intensa em todos os tratamentos. A aplicação de Mancozebe (2250 g i.a ha-¹) de maneira isolada ou associada: Azoxistrobina (94 g i.a ha-¹) + Tebuconazol (112 g i.a ha-¹) + Mancozebe (1194 g i.a ha-¹), garantiu menores porcentagens de desfolha e maiores produtividades de grãos. | Abstract: The objective of this work was to evaluate the efficiency of fungicides in controlling leaf spots in soybean crops, under field conditions. The experiment was conducted in Sinop/MT, coordinated by Embrapa Agrossilvopastoril. The fungicide treatments were: control without fungicide; carbendazim (500 g a.i.ha-¹); trifloxystrobin + prothioconazole (60 + 70 g a.i. ha-¹); pyraclostrobin + epoxiconazole + fluxapyroxade (64.8 + 40 + 40 g a.i. ha-¹); pyraclostrobin + fluxapyroxade (116.55 + 58.45 g a.i.ha-¹); bixafen + prothioconazole + trifloxystrobin (62.5 + 87.5 + 75 g a.i. ha-¹); azoxystrobin + tebuconazole + mancozeb (94 + 112 + 1194 g a.i. ha-1); mancozeb (1125 g a.i.ha-¹); mancozeb (2250 g a.i./ha-¹); chlorothalonil (1000 g a.i.ha-¹); fluxapyroxad + copper oxychloride (50 + 420 g a.i.ha-¹). A randomized complete block design was used, with four replications. Each experimental unit consisted of six 6.0 meter (m) lines, spaced 0.50 m apart. The efficiency of each product was determined based on the percentage of leaf area infected at phenological stages R6 and R7. Grain productivity (kg.ha-¹) was also evaluated. The data were analyzed statistically, with the means of significant variables compared using the Scott- Knott test, at 5% probability. The target spot severity was low, however, a statistical difference between the treatments was found, as to the severity of the disease and defoliation. No difference was observed as to the yield and weight of a thousand grains between treatments, regardless of the severity degree of the disease.

Publication year: 2023

Types of publication: Booklets

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