Fungicide association in the control of anthracnose in the soybean in Mato Grosso do Sul

Abstract

RESUMO -A soja é um produto agrícola mundial, justificando investimentos para reduzir fatores adversos à sua produção como a antracnose causada por Colletotrichum truncatum. Três experimentos foram conduzidos com o objetivo de avaliar o controle da antracnose por fungicidas, isolados ou em associação, na parte aérea da soja em duas épocas de semeadura na safra 2011/12 nas condições de Dourados e Maracaju (MS . Duas aplicações de fungicidas foram realizadas, a primeira no momento da detecção da doença no estádio R2 de desenvolvimento e a segunda 19 dias após. Foi avaliada a incidência e severidade média, desfolha, altura de plantas, altura da inserção da primeira vagem, número de vagens, produtividade e massa de mil grãos. Foi realizada a patologia de sementes com enfoque na incidência de C. truncatum. O uso de carbendazim, isolado ou em mistura, controlou a antracnose da soja na parte aérea e em sementes. A aplicação de fungicidas proporcionou redução na desfolha, menor porcentagem de pecíolos doentes, maior número de vagens, maior altura de plantas e ganhos na produtividade. Carbendazim + ciproconazol + picoxistrobina apresentou esporadicamente maior controle do que carbendazim isolado. Palavras-chave:Colletotrichum truncatum. Glycine max. Doença. ABSTRACT -The soybean is a worldwide agricultural product, and therefore justifies investments in reducing those factors that are unfavourable to production, such as anthracnose caused by Colletotrichum truncatum. Three experiments were carried out with the aim of evaluating the control of anthracnose by fungicides, either singly or in combination, in soybean shoots sown on two dates in the 2011/12 season, under the conditions found at Dourados and Maracaju in the State of Mato Grosso do Sul. An experimental design of randomised blocks with five replications was used. The treatments were: control, carbendazim 250 g a.i. ha . Two fungicide applications were performed, the first when the disease was detected at development stage R2, and the second 19 days later. The following were evaluated: incidence and average severity, defoliation, plant height, first pod height, number of pods, productivity and thousand grain weight. Seed pathology was carried out focusing on the incidence of C. truncatum. The use of carbendazim, singly or combined, controlled anthracnose in the shoots and seeds of the soybean. The application of fungicides resulted in reduced defoliation, a lower percentage of diseased petioles, a greater number of pods, greater plant height and gains in productivity. Carbendazim + cyproconazole + picoxystrobin occasionally displayed greater control than did single carbendazim.

Evaluation of Fungicides to Control Asian Rust and Anthracnose in Soybean

“…This compound and a mixture of epoxiconazole + pyraclostrobin were not able to control the disease at the R5.2 stage. Although the blend of Elatus ® /Aproach Prima ® /Sphere Max ® of the present study obtained a lower score compared to the other treatments, it was still able to control the disease progress, unlike the research conducted by Pesqueira et al (2016). This control may have occurred because of the diversity of compounds used in this research, hindering the proliferation of the pathogen.…”

“…Evaluating the formulation of Aproach Prima ® (Ciproconazol+Picoxystrobin), Pesqueira et al (2016) were not successful using the compound soon after the appearance of the first symptoms (R2 stage) in the susceptible Coodetec 219 RR cultivar, in the region of Dourados,MS, Brazil. This compound and a mixture of epoxiconazole + pyraclostrobin were not able to control the disease at the R5.2 stage.…”

“…One of the strategies to control these diseases is the use of fungicides (Pesqueira, et al 2016;Sacon, et al 2018). Fungicides are a class of agricultural pesticides that are essential for the effective control of plant diseases (Reis et al, 2014).…”

Botanical fungicides in the control of soybean leaf diseases / Fungicidas botânicos no controle de doenças foliares na soja

“…In this work, there was a statistical equivalence of the products from the noni plant to the fungicides (Figure 3), even in an adverse situation, with high disease pressure, expressed by the high severity in the plants (AUDPC). In the Anthracnose control in soy, it has already been verified by Pesqueira et al (2016), that fungicides application provided a reduction in defoliation, a diseased petioles lower percentage, a pods greater number, greater plant height and greater productivity. In the present work, under high inoculum potential, in the commercial area test, this effect could also be seen, both by the fungicides application and also in the treatment with noni essential oil.…”

“…Anthracnose, caused by the fungus Colletotrichum truncatum (Schw.) Andrus & Moore, is another very important disease that concerns producers for causing significant losses (Pesqueira et al, 2016).…”