A fungicide dresser against fungal phyto-pathogens of narrow-leaf lupin

Abstract

The laboratory and field study of the dresser Delete Pro SC (suspension concentrate) effectiveness against anthracnose agent and other lupin diseases was carried out in Bryansk region in 2019-2021. Seeds, seedlings and sowings of the narrow-leaf lupin of Vityaz variety were the objects for the research. In the laboratory the effectiveness of Delete Pro (piraclostrobine 200 g/l) was tested in three doses of use (0.5; 1.0 and 1.5 l/t). Biological effectiveness was estimated by the number of infected seedlings grown in paper-and- polyethylene rolls compared to the control (without treatment). The dose 1.5 l/t had the high biological effectiveness against anthracnose (99.4 %). The total germination and the number of seeds with strong seedlings made 99.6 % and 90.4 %, respectively. The length of the roots and hypocotyl of the seedlings reliably increased by 9.4 and 10.6 mm, respectively. In the field test the seeds were treated with 1.5 l/t Delete Pro a month before sowing. The effectiveness of the fungicide was compared to the control variant without treatment. The average dresser biological effectiveness against anthracnose seed infection was 94.3 % during tests years. By the stage of brilliant pod the infected pods number decreased to 3.2 compared to 21.1 % in the control. Fusarium infection decreased from 20.1 % in the control to 13.7 % in the variant; risoctonia solari infection decreased from 9.4 % to 3.0 %. The development of Botrytis blight on the pods decreased 2.8 times. The significant true (LSD05 = 0.82) increasing of seed germination made 13.3 % and survival of productive plants by the harvest period increased by 32.4 %. Due to the application of the fungicide dresser Delete Pro SC (1.5 l/ha), the significant seed yield rise was 0.75 t/ha (LSD05 = 0.03); the cost recovery was 5.11 rubles.