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-1, pyraclostrobin 66.5 g a.i. ha-1 + epoxiconazole 25 g a.i. ha-1, picoxystrobin 60 g a.i. ha-1 + cyproconazole 24 g a.i. ha-1, carbendazim 250 g a.i. g-1 + pyraclostrobin 66.5g a.i. ha-1 + epoxiconazole 25 g a.i. ha-1 and carbendazim 250 g a.i. ha-1 + picoxystrobin 60 g a.i. ha-1 + cyproconazole 24 g a.i. ha-1. 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.
Key words:
Colletotrichum truncatum; Glycine max; Disease
