EFFECT OF DICAMBA ON THE GROWTH AND DEVELOPMENT OF SCOTCH PINE SEEDLINGS (PINUS SYLVESTRIS L.) IN A FOREST NURSERY

Abstract

The article presents the results of a study of the effect of a synthetic preparation with auxin-like activity (dicamba), which is part of the broad-spectrum systemic herbicide Propolol (diastar, VR (480 g / l of dicamba acid, dimethylamine salt) (trade name «Propolol», manufacturer - CSP-Technoexport LLC, registrant - TPK Technoexport JSC), on the morphometric parameters of the current year shoots of six-year-old Scots pine (Pinus sylvestris L.) seedlings grown in nursery conditions. It was found that the use of the preparation in the phase of active plant growth leads to a decrease in linear dimensions and the appearance of monstrosity (deformations) and teratogenesis in the form of twisting of young shoots, shortening and twisting of needles, thickening of the terminal parts of the central and lateral shoots of the current year. The use of a protective screen when treating the territory with a working solution of the preparation "Propolol" Leads to the development of monstrosity and teratogenesis in 36% of plants, and the absence of a protective screen in 44% of plants. Complete (100%) damage to the current-year shoots of Scots pine seedlings, manifested by twisting and complete drying, is observed when the working solution of «Propolol» is applied directly to the plants during treatment. After the end of growth processes (the phase of final shoot growth and lignification and needle cutinization), the studied herbicide has no negative impact on Scots pine seedlings, regardless of the treatment method.