Abstract
We present the results of two field experiments performed on forest lands in the Leningrad region in 2019–2020. As means to control unwanted vegetation the herbicide Gorgon (water-soluble concentrate, active ingredients: MCPA - 350 g/l and picloram - 150 g/l) was used. We found that at rates of 1.5–4.5 l/ha the herbicide was highly efficient in suppression of a wide range of undesirable dicotyledonous species, but had almost no effect on monocotyledonous species such as grasses, sedges and rushes; as a result, the latter grew rapidly and abundantly. Gorgon is effective towards unwanted deciduous trees (willow, birch, aspen and mountain ash), and at a rate of 4.5 l/ha, also towards conifers (Scots pine and European spruce). At rates of 1.5–4.5 l/ha, the herbicide is promising for use on forest road sides, clearings, forest hayfields, on forest plantations before planting trees, as well as under power transmission lines and along pipelines passing through forest lands.
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