Development of winter wheat leaf diseases depending on the variety and the use of fungicides | Ziemas kviešu lapu slimību attīstība atkarībā no šķirnes un fungicīdu lietošanas
2020
Bimsteine, G., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture | Smirnovs, O., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture | Rutenberga-Ava, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture
Winter wheat leaf diseases are capable of causing major crop losses, especially if they are not controlled. The range of varieties available for cultivation is very wide. The aim of the present investigation was to estimate the development of leaf diseases depending on wheat variety and the use of fungicides. Field trials were carried out at two places in 2018/2019: 1) Study and Research Farm “Pēterlauki”; 2) Research Institute of Agronomy in Skrīveri. In total, 10 different wheat varieties (‘Skagen’, ‘SW Magnific’, ‘Fredis’, ‘Edvins’, ‘94-5-N’, ‘12-27’, ‘12-292’, ‘Malunas’, ‘Rotax’, and ‘Julius’) were compared. Tan spot (caused by Pyrenophora tritici-repentis) and septoria leaf blotch (caused by Zymoseptoria tritici) were the dominant diseases. In the trial arranged in Skrīveri, the development of tan spot was significantly influenced by the wheat variety (p is less than 0.002); while in the trial in “Pēterlauki”, the disease development was significantly affected by fungicide (p is less than 0.005). The development of septoria leaf blotch in Skrīveri was significantly affected by both the variety and the fungicide (p is less than 0.002), whereas in “Pēterlauki” – only by the fungicide (p is less than 0.005). The calculated technical efficiency differed between the sites and the varieties. In general, in the trial in Skrīveri, it was higher (on average, above 50%), except for the varieties “Fredis” and “12-27”, for which the technical efficiency of fungicide use in the “Pēterlauki” trial reached 58% and 53%, respectively.
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