Evaluation of efficacy of modern fungicides against fusarium head blight on winter wheat

Abstract

Goal. To study the influence of modern biological and chemical preparations on the development of fungi of the genus Fusariumunder conditions of artificial inoculation.
 Methods. The efficacy of fungicides was studied in 2018—2019 in the Zhytomyr region, Pulinsky district under the conditions of artificial inoculation on winter wheat of the Bogdan variety. Mixture of conidia of the fusarium fungi (F. graminearum, F. culmorum, F. poae, F. avenaceum) was used for ear inoculation. The plot area was 2 m2 in four replications, the plot placement was randomized. The inoculation of winter wheat ears was carried out at the phase of mass flowering. At the phase of milky-wax maturity, records were taken to determine the spread and development of the disease. The following fungicides were used to protect wheat crops: Folicur BT EC, 1.2 l/ha, Magnello 350 EC, 1.0 l/ ha, Haupsin, 0.2 l/ha, Fitodoktor, 0.05 kg/ha, Alliot 250 EC, 0.5 l/ ha, Bumper Super EC, 1.2 l/ha and mixtures of Magnello 350 EC, 0.75 l/ha + Haupsin 0.2 l/ha, Magnello350 EC, 0.75 l/ha + Fitodoktor, 0.05 kg/ha.
 Results. The results obtained during the years of investigationsindicate that the used preparations are efficient for the protection of crops from fusarium head blight on winter wheat. However,not all fungicides tested had high enough efficacy. The most effective against the pathogens F.graminearum, F. culmorum, F. poae, F. avenaceumunder conditions of Zhytomyr region were fungicides Folicur BT EC, 1.2 l/ha, Magnello 350 EC, 1.0 l/ha and mixtures of fungicide and biological preparation (Magnello 350 EC, 0.75 l/ ha + Haupsin, 0.2 l/ha). Efficacy of fungicides used against these pathogens ranged from 69.2% to 75.2%. After fungicide application the weight of 1000 grains increased by 7.3—13.6 g. Significant difference between experimental variants and untreated check on 1000 grain weight was noted. With the use of fungicides, the yield increased by 22.3—24.8%.
 Conclusions. The analysis of the protection against fusarium head blight convinces the need to apply chemical protection measures when weather conditions are favorable for the development of the disease. In the growing seasons of 2018—2019, under conditions of the Zhytomyr region, the most promising and effective against the pathogens F.graminearum, F. culmorum, F. poae, F. avenaceum were fungicides Folicur BT EC, 1.2 l/ha, Magnello 350 EC, 1.0 l/ ha and mixtures of fungicide and biological preparation Magnello 350 EC, 0.75 l/ ha + Haupsin, 0.2 l/ha.