Widely spread in Argentina, late season diseases (LSD), cause yield losses and seed quality changes. Leaf application of fungicides is an effective procedure to manage LSD under the current cropping conditions (monocrop and no-till system). The aims of the present study were 1) to determine causal agents of LSD, 2) to evaluate yield reduction caused by LSD and 3) to evaluate the efficiency of mixtures containing triazoles and strobirulins, sprayed during R3 or R5 reproductive stages to control LSD. Four experiments were carried out in a randomized complete block design, with four replicates in Armstrong, Santa Fe, Argentina, in a soybean cultivation area in the Pampeana Region. Two assays were performed in 2004/2005, and the remaining ones in 2005/2006 growing seasons. Two azoxystrobin mixtures, one with cyproconazole and the other with difenoconazole, and a mixture of the latter two were tested. The following pathogens were detected: Cercospora kikuchii, Colletotrichum truncatum, Septoria glycines, Glomerella glycines y Phomopsis sojae. All treatments presented higher yield than control, with 5 percent of statistic significance. It can be concluded that, under the present experimental conditions, characterized by frequent rains between R1 and R5.5, the tested mixtures efficiently controlled LSD.
Carmona, M., Gally, M. E., Sautua, F. J., Abello, A., & Lopez, P. (2011). Uso de mezclas de azoxistrobina y triazoles para controlar enfermedades de fin de ciclo de la soja. Summa Phytopathologica,37, (2),p.134-139
10.1590/S0100-54052011000200009
Carmona, Marcelo Aníbal, Gally, Marcela Edith, Sautua, Francisco José, Abello, Andrés, Lopez, Pedro. 2011. "Uso de mezclas de azoxistrobina y triazoles para controlar enfermedades de fin de ciclo de la soja". Summa Phytopathologica 37, no.2:134-139.
Recuperado de http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2011Carmona