Alternative products to control powdery mildew in soybeans culture in field

Gislaine Gabardo,Mônica Gabrielle Harms,Henrique Luis Da Silva,Maristella Dalla Pria

doi:10.14393/bj-v37n0a2021-53681

Gislaine Gabardo, Mônica Gabrielle Harms + Show 2 more

Open Access

https://doi.org/10.14393/bj-v37n0a2021-53681

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Abstract

The occurrence of powdery mildew (Microsphaera diffusa) in soybean (Glycine max L.) has increased in the last harvests. In order to study the efficiency of powdery mildew control due to the application of alternative products and conventional fungicide, trials were conducted in Ponta Grossa, PR, Brazil, during the 2013/2014 and 2014/2015 growing seasons. The design used was randomized blocks with four replications. The treatments for the experiments were: 1 - control; 2 - acibenzolar-S-methyl (Bion 500 WG®); 3 - calcium (Max Fruit®); 4 - Micronutrients: copper, manganese and zinc (Wert Plus®); 5 - Micronutrients: manganese, zinc and molybdenum (V6®); 6 - NK fertilizer (Hight Roots®); 7 - Ascophyllum nodosum (Acadian®) and 8 - fungicide (azoxystrobin + cyproconazole) (Priori XTRA®) with the addition of the adjuvant. Four applications of alternative products (phenological stages V3, V6, R1 and R5.1) and two of fungicide (phenological stages R1 and R5.1) were carried out. The parameters evaluated were powdery mildew severity and productivity. The severity data made it possible to calculate the area under the disease progress curve (AUDPG). Alternative products didn’t reduce powdery mildew in the two harvests. The conventional fungicide treatment was the only one that controlled powdery mildew and didn’t reduce the productivity in both experiments.

Highlights

Soybean (Glycine max (L.) Merril) is the most important oilseed globally (Anderson et al 2019)
In order to study the efficiency of powdery mildew control due to the application of alternative products and conventional fungicide, trials were conducted in Ponta Grossa, PR, Brazil, during the 2013/2014 and 2014/2015 growing seasons
Powdery mildew caused by the fungus Microsphaera diffusa Cke. & Pk. stands out, since the 1996/97 harvest it has gained importance among the diseases that affect soybeans in the South and Midwest regions of Brazil, causing damage to yield estimated between 30% and 40% (Blum et al 2016; Roese et al 2017)

Summary

Introduction

Soybean (Glycine max (L.) Merril) is the most important oilseed globally (Anderson et al 2019). Due to its productive potential, protein source, chemical composition and nutritional value (USDA 2019). It is the main grain crop produced in Brazil, the occurrence of diseases is a limiting factor for high yields (Battisti et al 2018). Powdery mildew caused by the fungus Microsphaera diffusa Cke. & Pk. stands out, since the 1996/97 harvest it has gained importance among the diseases that affect soybeans in the South and Midwest regions of Brazil, causing damage to yield estimated between 30% and 40% (Blum et al 2016; Roese et al 2017). Alternative products to control powdery mildew in soybeans culture in field The significant reduction in soybean yield is due to the reduction of the photosynthetically active area (Barcelos et al 2018).

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