Pre-sowing seed treatment of narrow-leafed lupin against anthracnose and other diseases

Abstract

The results of laboratory and field studies of the effectiveness of the Tirada SK disinfectant (suspension concentrate) against anthracnose seed infection and other lupine diseases are presented.The work was carried out in 2018-2020 in the Bryansk region. The object of study is the seeds, seedlings and crops of the Vityaz narrow-leafed lupin. In laboratory conditions, the effectiveness of the Tirada SK disinfectant (tiram 400 g / l + difenoconazole 30 g / l) was studied in three application doses (1.0; 1.5; 2.0 l / t). The biological effectiveness was evaluated by the number of infested seedlings grown in paper-polyethylene rolls compared to the control (without dressing). High biological effectiveness (100%) against anthracnose was shown by doses of 1.5 and 2.0 l / t. The highest overall germination (99.6%) and the number of seeds with strong seedlings (90.4%) were noted in the variant with a dose of 1.5 l / t. At the same time, the length of roots and hypocotyl of seedlings increased significantly (LSD05 = 0.69 and LSD05 = 0.51) by 18.0 and 1.0%, respectively. The field experiment was carried out in four repetitions, the plot area was 34 m2. The seeding rate was 1.2 1.2 million viable seeds / ha. The soil of the plot is grey forest with the humus content of 2.7%. The predecessor is spring sown cereals. Seed dressing with Tirada disinfectant at a consumption rate of 1.5 l / t was applied one month before sowing. The effectiveness of the disinfectant was evaluated in comparison with the control. The average biological effectiveness of the disinfectant against anthracnose infection was 94.3%. By the shiny pod phase, the number of affected pods was 5.7%, compared to 26.4% in the control. Plant infestation by Fusarium (Fusarium spp.) was reduced from 18.7% in the control to 11.8% in the experiment and by Rhizoctonia (Rhizoctonia solani Kuhn.) from 9.8% to 2.8%. The spread of grey rot and white rot on pods has been reduced by a factor of 2.4 and 2.8, respectively. The seed germination increased significantly (LSD05 = 0.71) by 8.1% and the safety of productive plants at harvest increased by 35.3%. A significant (LSD05 = 0.041) increase in seed yield was 0.82 t/ha, with a cost recovery of 7.15 rubles.