Abstract
In the researches regarding the efficacy of biological products and herbal extracts for the control of Bacterial leaf spot at round pepper, Creola variety was studied at Vegetable Research and Development Station Bacau, in open field conditions. The degree of attack at X. vesicatoria exceeded the economical threshold in 2018. In 2019 the degree attack of Bacterial leaf spot at round pepper did not exceed 1.2%. The best efficacy in the control of Bacterial leaf spot at round pepper in the open field had the variant treated with V5 - The bordeaux mixture - 0.5%, the percentage of efficiency at 7 days after infection with Bacterial leaf spot at round pepper sp. being 84%. It was followed by: V2, Funres – 0,25% with 81.5% efficiency, V1 Condor – 0,25% with 80.0 % efficiency, V3 Blocks – 0,25% with 67.7% efficiency and V4 Nettle maceraate - 0.5% with 35.4% efficiency. Percentage of healthy plants varied depending on the treatment variant, the values being 99.0% in variant 5 treated with The bordeaux mixture 0.5%, 98.8 % in V2 – Funres 0.25%, 98.7% in variant 1 treated with Condor 0.25%, 97.9% in V3 Blocks – 0,25%, and 95.8% in V4 treated with Nettle macerate - 0.5%. In pepper variants the plants attacked by X. vesicatoria during the period of June - the first decade of September resumed their vegetation and fruit set. As a result, GA% decreased progressively. In 2019 the degree attack of Bacterial leaf spot at round pepper was under economical threshold and there were no significant differences between the variants. In the conditions of a very low attack of Bacterial leaf spot at round pepper in 2019, the efficiency of all variants was above 97.7% (V1 Condor – 0,25%, 98.9%: V2 Funres – 0,25%, 99.2%: V3 Blocks – 0,25%, 97.7%:V4 Nettle maceraate - 0.5, 98.1%: V5 The bordeaux mixture 0.5%, 99.2%).