The best efficacy in control of early blight at tomato in the germination phase of the seeds was the variant treated with bordelae - 0.5%, the percentage of healthy plants after 7 days infection with Alternaria sp. being 90%. However, a strong retardant effect was observed on both the stem and the embryonic root, with a smaller growth rate of 54% for the root and 47.31% for the strain. In variant 1 the efficacy was 85%, the increase of the root and the strain being smaller compared to the uninfected variant, with 8.5% and 11.5%, respectively. Variant 4 demonstrated that although 0.5% nettle macerate treatment is not a fungicide, 50% of tomato plants have been stimulated to develop tolerance and vegetation following infection with Alternaria sp. In this case, there was also a reduction of the root and embryonic stem growth by 19.3 and 37.6%, respectively. The variant treated with Funres - 0.25% and Blocks - 0.25% did not survive infection with Alternaria sp in the germination phase. In open field variant 5, treated with bordelae - 0.5% had the best efficacy - 84.5%, followed by variant 1, with an efficiency of 71.8%. The variants treated with nettle macerate and Blocks had a lower efficacy of 54.3% and 53.3%, respectively. The variant treated with Funres showed a lack of efficacy in control of tomato early blight. Percentage of healthy plants varied depending on the fungicides being 96% in variant 5 treated with bordelamine - 0.5%, 92% in variant 1 treated with 0.25% Condor (based on Trichoderma atroviride and Glomus spp) and 88% in variants treated with 0.5% nettle macerate and Blocks – 0,25%.
