Biologically active microorganisms for inhibition Ambrosia artemisiifolia L

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.

Automated summary

This study evaluated the use of various microorganisms for controlling the quarantine weed common ragweed, and found that multi-component formulations had higher herbicidal efficacy compared to single microorganism treatments in laboratory conditions. The emulsion formulation containing refined vegetable oil, lecithin, Tween 80, and mycelium of S. heliopsidis exhibited promising results in field conditions, causing significant damage to the weed two weeks post treatment.