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38

Efficacy of fungicide F500 in controlling final cycle diseases in soybean

Presenter: Edson Begliomini

Other authors and affiliations: Marco Antonio Tavares Rodrigues, Eduardo Lima Leduc, Sergio Zambon, Ramiro Ovejero, Domingos Zandonade. BASF-SA, AGRO APS, São Paulo 04538-132, Brazil

Final cycle diseases (FCD) is a complex of diseases that include Cercospora sojina, Cercospora kikuchii, and Septoria glycines that can cause significant productivity losses when the field conditions are favorable for disease. The objective of this study was to evaluate different ready-mixes of azoles + strobilurines fungicides against FCD in soybean. Two trials were performed in different locations of Parana State, Brazil (Ponta Grossa and Maua da Serra). The experimental design involved randomized blocks with four replications, having a plot size of 2 × 10 m. Different ready-mix fungicides were sprayed to control FCD. The treatments were sprayed at first symptom or flowering period (R1–R3). The applications were performed with a CO2-propelled backpack sprayer equipped with Teejet nozzles (XR 8001 or XR 110015), 40 lb pol–2, and a spray volume of 150 liters ha–1. The severity of the disease was evaluated at growth stage R6 and at defoliation. The results of the trials show the ranking of the treatments as follows: F500 + metconazole (65 + 40 g a.i. ha–1) > F500 + epoxiconazole (66.5 + 25 g a.i. ha–1) > azoxystrobin + ciproconazole (60 + 24 g a.i. ha–1) + specific adjuvant (0.5% v/v) > tryfloxystrobin + cyproconazole (60 + 20 g a.i. ha–1) + specific adjuvant (0.25% v/v) > tryfloxystrobin + tebuconazol (50 + 100 g a.i. ha–1) + specific adjuvant (0.25% v/v). All ready-mixes, regardless of the formulation composition, greatly reduced the severity of the disease. However, it was observed that ready-mixes that contain fungicide F500® (BASF) had longer residual control and better yield than did others.

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