THE EFFECT OF FUNGICIDES APPLIED AT DIFFERENT TIMES ON THE SPREAD OF FOMOSE IN A WINTER OILSEED RAPE CROP

Abstract

The field experiment was carried out in 2020-2021 at the Lithuanian Agroforestry and Science Centre, Akademija, Kėdainiai district. Soil - sandy heavy loam. The aim of the study was to justify the timing of the application of different fungicides to reduce the spread of Phoma stem canker (Leptosphaeria maculans) in a winter rape crop. Different fungicide application times were investigated:

1. Control (unsprayed)
2. Juventus (v. m. metconazole 90 g l-1) - 0.7 l ha -1 (BBCH 14-20);
3. Propulse (v. m. fluopyram 125 g l-1, prothioconazole 125 g l-1) - 0,8 l ha-1 (BBCH 14-20);
4. Tilmor (v. m. tebuconazole 160 g l-1, prothioconazole 80 g l-1) - 0,8 l ha-1 (BBCH 14-20);
5. Juventus 0,7 l ha-1 (BBCH 14-20) + Juventus 0,7 l ha-1 (BBCH 31-59);
6. Propulse 0,8 l ha-1 (BBCH 14-20) + Propulse 0,8 l ha-1 (BBCH 31-59);
7. Tilmor 0,8 l ha-1 (BBCH 14-20) + Tilmor 0,8 l ha-1 (BBCH 31-59);
8. Juventus 0,7 l ha-1 (BBCH 31-59);
9. Propulse 0,8 l ha-1 (BBCH 31-59);
10. Tilmor 0,8 l ha-1 (BBCH 31-59).

Results: The experiment showed that the incidence and intensity of Phoma stem canker was lower with different fungicide application timings. Fungicide application had a significant effect on the spread of Phoma stem canker. The lowest incidence and intensity of Phoma stem canker was recorded in 6 fields of the experimental variant compared to the control variant.