Row spacing, cultivar and fungicide application affect the incidence of soybean stem blight

  • Nédio Rodrigo Tormen University of Brasilia
  • Luiz Eduardo Bassay Blum Universidade de Brasília
Keywords: Diaporthe phaseolorum var. sojae., Glycine max., Row spacing.

Abstract

Brazil is a major soybean production country and cultivate yearly more than 36 million hectares. Several factors have been reported reducing soybean production and occurrence of diseases is one of the most important. Some diseases such as the pod and stem blight (Diaporthe phaseolorum var. sojae) can limit soybean yield by shortening plant cycle and reducing seed quality. Field experiments were conducted aiming to evaluate the effect of row spacing, soybean cultivar and fungicide application on the incidence of pod and stem blight on soybean. The trial was carried out twice, with planting date at 11/15/2012 and 12/15/2012, in Planaltina-DF, Brazil. Treatments were arranged in a split-split plot scheme obeying the randomized block design. The factors evaluated were row spacing (42, 60 and 75 cm), soybean cultivars (“Syn1180RR” and “Syn1080RR”) and spray or not the fungicide Boscalid (500 g a.i./ha) at R1 and R3 soybean growth stages. Disease incidence was assessed on stems at the harvest time and on seeds after harvest and yield was estimated. Results obtained show that broader row spacing increased disease incidence on stems and seed, cultivar “Syn1180RR” was more susceptible than “Syn1080RR” and fungicide application reduced disease incidence. Pod and stem blight significantly reduced soybean yield.

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Author Biographies

Nédio Rodrigo Tormen, University of Brasilia
Engenheiro Agrônomo e Dr. em Fitopatologia.
Luiz Eduardo Bassay Blum, Universidade de Brasília
Possui graduação em Agronomia [Universidade de Brasília (1985)], mestrado em Fitopatologia [Universidade de Brasília (1989)] e doutorado em Plant Pathology [Auburn University (1998)]. Atual chefe do departamento de Fitopatologia da UnB (2017/2019).
Published
2020-06-08
How to Cite
Tormen, N. R., & Blum, L. E. B. (2020). Row spacing, cultivar and fungicide application affect the incidence of soybean stem blight. Bioscience Journal , 36(5). https://doi.org/10.14393/BJ-v36n5a2020-42123
Section
Agricultural Sciences