The influence of treatments with various phytosanitary products (fungicides) on the attack of some phytopathogenic fungi on barley harvest, Donau variety, in 2019 pedoclimatic conditions of Eastern Baragan

Abstract

This study aims at monitoring the dynamics of the occurrence and evolution of the attack of some pathogenic agents to barley, among which we mention: mildew (Blummeria graminis f.sp. hordei), leaf stripe (Pyrenophora graminea) and barley’s rust (Puccinia hordei). Also, the influence of applying these fungicides on the harvest was monitored, as compared to the untreated control variant. For this study, an experiment with 6 treatment variants was created, in which the following phytosanitary products were used, as follows: ACANTO PLUS (picoxystrobin 200 g/l + cyproconazole 80 g/l); MYSTIC 250 EC (tebuconazole 250 g/l); FALCON PRO (prothioconazole 53 g/l+tebuconazole 148 g/l + spiroxamine 224 g/l); CAPALO (fenpropimorph 200g/l, epoxiconazole 62.5 g/l, metrafenon 75g/l). The treatment variants were the following: V1 - ACANTO PLUS 0.5 L/HA, 1 treatment applied at spike’s release - blooming (5.05. 2019); V2 - ACANTO PLUS 0.5 L/HA, 1 treatment applied in “bellows” phase (20.04.2019) + 1 treatment applied at the beginning of kernel’s filling (27.05.2019); V3 - CAPALO 1.0 L/HA, 1 treatment applied at spike’s release - blooming (5.05. 2019); V4 - MYSTIC 250 EC 0.5 L/HA + 1 CAPALO 0.5 L/HA treatment applied in “bellows” phase (20.04.2019) + 1 treatment applied at the beginning of kernel’s filling (27.05.2019); V5 - FALCON PRO 0.6 L/HA, 1 treatment applied at spike’s release - blooming (5.05.2019); V6 - ACANTO PLUS 0.5 L/HA +- FALCON PRO 0.5 L/HA, 1 treatment applied in “bellows” phase (20.04.2019), 1 treatment applied at the beginning of kernel’s filling (27.05. 2019), V7 – Untreated control variant. The experiment was placed in Latin square; the 7 variants being placed in 7 repetitions. The first two leaves placed under the spike had been analysed for the above. Among the pathogenic agents under monitoring, the greatest attacks were produced by Pyrenophora graminea fungus which produces barley leaf stripe disease. The harvests of the variants were the following: V1 - 5634 kg/ha, V2 - 5951 kg/ha, V3 - 5669 kg/ha, V4 - 5658 kg/ha, V5 - 5494kg/ha, V6 - 5704 kg/ha and V7 (untreated control variant) - 5506 kg/ha.