Evaluation of fungicide application programmes for Septoria tritici blotch control in winter wheat

Impact of Fungicide Treatment Schemes on the Severity of Leaf Blotches in Winter Wheat

“…Our results support the findings of other researchers that fungicide treatment significantly reduced the severity of tan spot and Septoria tritici blotch (Bhatta et al, 2018;Jørgensen et al, 2014;Verikaite et al, 2022). Several research projects show that rapid development of tan spot started only after flowering, and a single fungicide application ensures good efficacy (Bankina et al, 2014;Wegulo, Breathnach, & Baenziger, 2009;Wyczling, Lenc, & Sadowski, 2010).…”

“…Results of our study indicate that in the years when severity of Septoria tritici blotch was high, the best efficacy was obtained when fungicide application was done two times: at GS 32-33 and GS 55-59. This coincides with findings in Lithuania, where the most effective control of Septoria tritici blotch was obtained when fungicide was divided into two applications: the first application was done 8-10 days after rain, and the second application after two weeks coincided with full emergence of flag leaf (Verikaite et al, 2022).…”

“…In our study, a strong significant correlation between the severity of Septoria tritici blotch at GS 75-77 and grain yields was established only in 2020, under the higher pressure of diseases. Similar results were obtained in Lithuania in 2020 (Verikaite et al, 2022).…”

“…The high rainfall favours conidia transport from the lower leaves to the upper and the germination of spores (El Jarroudi et al, 2022). Similar to other research, in our trials, Septoria tritici blotch dominated in the year with the highest amount of precipitation (2020) (Creissen et al, 2018;Verikaite et al, 2022). Although research reports that precipitation increases the severity of tan spot (Schierenbeck et al, 2019), there was a low severity of tan spot in 2020.…”

Fungicide sensitivity levels in the Lithuanian Zymoseptoria tritici population in 2021

“…Several measures had already been investigated to delay the emergence and spread of fungicide resistance in pathogen populations, and to ensure effective disease control. Researchers suggest strategies that include choosing resistant varieties, using fungicide mixtures and dose rate changing ( Hobbelen et al., 2014 ), minimizing the number of fungicide applications by selecting appropriate application timings ( Verikaite et al., 2022 ), and other integrated pest management (IPM) measures ( Ponomarenko et al., 2011 ).…”