Biologically active microorganisms for inhibition Ambrosia artemisiifolia L

Abstract

Abstract The paper presents data on the evaluation of a number of microorganisms for biocontrol of the quarantine weed, Ambrosia artemisiifolia L. (common ragweed). Relatively high herbicidal efficacy (50% of dead seedlings of common ragweed) of multicomponent formulations based on a strain 32.85 of the necrotrophic phytopathogenic fungus Stagonosporopsis heliopsidis and a strain 4 of the phototrophic cyanobacteria Nostoc sphaeroides was experimentally demonstrated in laboratory conditions. This was twice higher compared to treatment with one microorganism. The emulsion formulation based on 0.5% refined vegetable oil + 1.0 % lecithin + 0.1% Tween 80 and 4% chopped mycelium of S. heliopsidis 32.85 was evaluated against A. artemisiifolia in the field conditions of Crimea foothills. The damaged leaf surface area was about 18% 2 weeks post treatment of the weed.