A perspective fungicide for protection of narrow-leaved lupin from diseases during the growth season

The article presents the laboratory and field tests results for the effectiveness of the fungicide Protazox SC (suspension concentrate) against anthracnose and other lupin diseases. The tests have been done in Bryansk region in 2020–2022. The study objects were seedlings and vegetative plants of the narrow-leaved lupin Vityaz variety. The effectiveness of protective and curative properties of the fungicide Protazox SC (azoxistrobine + protioconazole + dipheconazole, 200 + 125 + 60 g/l) was tested for 0.5; 1.0 and 1.5 l/ha consumption rates under laboratory conditions. The biological effectiveness was evaluated according to the number of infected seedlings grown in paper-and-plastic rolls compared to the control variant (fungicide free). The maximal rate of the fungicide – 1.5 l/ha – had the highest biological effectiveness of protective and curative properties (98.7 and 97.4 %); this corresponds to the effectiveness of the reference fungicide Kolosal Pro with the using rate of 0.4 l/ha. In a field test the fungicide Protazox at using rate of 1.5 l/ha was applied for lupin crops at the growing stages of “1-2 pairs of true leaves” and “bud formation” of lupin. The fungicide effectiveness was evaluated compared to the control without treatment. Biological effectiveness of the tested fungicide against anthracnose made 95.8 %, it was 4.5 % higher than of the reference fungicide Kolosal Pro. To the stage of “shiny pod” the number of anthracnose infected pods treated with the fungicide Protazox decreased to 1.5 % compared to 26.5 % in the control variant. Fusarium infection of plants decreased from 24.6 % in the control to 12.0 % in the variant with the fungicide. The spread of gray and white rot on beans decreased by 5.0 and 6.7 times, respectively. The viability of productive plants by the harvesting period increased by 41.3 %. Thanks to the application of the fungicide Protazox SC (1.5 l/ha) the significant narrow-leaved lupin seed yield rise of 0.91 t/ha was obtained (LSD05 = 0.04); the cost recovery was 2.56 rubles.