Association of multisite and site-specific fungicides in the control of Puccinia triticina and its effects on wheat yield

Abstract

The wheat (Triticum aestivum L.) crop has great importance in the national context, the diseases are one of the main factors of losses, which emphasizes the importance of the pest system Triticum aestivum L. x Puccinia triticina Eriks. The aim of this study was to evaluate the efficiency of the combination of site-specific and multisite fungicides in the control of wheat leaf rust and its effects on crop yield. The evaluated treatments were: Control (absence of fungicide application); T + P (trifloxystrobin + prothioconazole); P + F (pyraclostrobin + fluxapyroxad); T + P + Mb (trifloxystrobin + prothioconazole + mancozeb); P + F + Mb (pyraclostrobin + fluxapyroxad + mancozeb) and Mb (mancozeb). Greater control of the disease was observed with the association of fungicides, there is a correlation between control and crop productivity, especially in harvest with greater severity of the disease. Highlighted Conclusions 1. At low severity the wheat leaf rust does not present damage on crop productivity. 2. The association of multisite and site-specific fungicides increases the disease control effect. 3. The application fungicide program with the association of different a.i. maintains the crop yield potential. 4. The disease control has a positive effect on the yield components, on the other hand, the AUDPC presents a negative correlation.

Aplicação De Fungicidas Visando O Controle De Mancha Amarela E Ferrugem Da Folha Em Trigo

“…Além disso, também foram determinados o peso de mil grãos (PMG, g) e o peso hectolítrico (Ph). Com base na umidade de cada amostra foi realizada a correção da produtividade, Ph e PMG, para 13% (SACON et al, 2019).…”

“…(29/09/2018; 1ª aplicação), florescimento (08/10/2018; 2ª aplicação) e pósflorescimento (22/10/2018; 3ª aplicação), em um intervalo de, aproximadamente, 15dias (Figura 1).Para a avaliação de severidade da mancha amarela e ferrugem da folha, foram realizadas vistorias no experimento a cada sete dias a partir do estádio fenológico de elongação do colmo. Avaliou-se 10 folhas por parcela(SACON et al, 2019), comparando as sintomáticas com as escalas diagramáticas propostas por James (1971) para a mancha amarela; e Cobb(PETERSON et al, 1948), para a ferrugem da folha.…”