Evaluation of the biological effectiveness of the biofungicide Serenade ASO, SC in the fight against bacterial black spot of tomatoes ( Xanthomonas campestris pv. vesicatoria (Doidge) on indoor tomatoes

The article presents the results of two-year studies on the biological effectiveness of biofungicide Serenade, ASO, SC (Bacillus amyloliquefaciens, strain QST-713, titer not less than 1x10 9 CFU/ml) in the fight against bacterial black spot on the leaves and fruits of indoor tomatoes in the conditions of the II soil-climatic zone of the Crimea. It was found that a five-time treatment with biofungicide Serenade, ASO, SC, the rate of application of 5.0, 6.5 and 8.0 l/ha, contributed to a decrease in the intensity of development of Xanthomonas campestris pv. vesicatoria on leaves by 2.3-2.9 times, on fruits by 2.2-2.7 times. On the 10th day after the fifth spraying, the biological effectiveness of biofungicide Serenade, ASO, SC in the application rates of 5.0, 6.5 and 8.0 l/ha, with an average development of bacterial black spot on the control variant (3.3-5.2% on leaves, 2.9-3.3% on fruits), on leaves was 76.5-85.1%, on fruits – 71.6-75.0%. On the day of the last harvest, on the 29th day after the last treatment, the biological efficiency on leaves was 57.3-65.4%, on fruits – 54.5-62.6%. The difference of five-time treatment with biofungicide Serenade, ASO, SC in the norm of application of 8.0 l/ha, with the standard is insignificant, within the limits of experimental error. The positive effect of biofungicide Serenade, ASO, SC on yield was noted. The difference with the control (77.9 c/ha) is 34.9, 36.9 and 41.0 c/ha.