Assessment of methods for controlling chestnut mining moth (Cameraria ohridella Deshka et Dimic) at landscape architecture objects in the city of Orel

Currently, it has been determined that the main cause for damaging urban green spaces is invasion. The chestnut mining moth is a serious threat to chestnut plantations. In the Orel region, this invasive species, as well as the damage it causes to horse chestnut, have been a serious problem for the region for the last 10-15 years. The aim of the work was to evaluate the effectiveness of the insecticide Locustin for controlling chestnut mining moth (Cameraria ohridella Deshka et Dimic) on plantations of Aesculus hippocastanum L. at the objects of landscape architecture in Orel: arboretum of the Orel state agrarian university, Victory Boulevard. The method of use is stem injections. The dose is 5 ml per plant, the number of treatments is once in the budding phase (mid-May). The assessment of damage to the leaves of horse chestnut by chestnut mining moth was carried out on a scale developed by S.A. Tribel and O.N. Gamanova. The plantings were assessed visually, according to the condition of the crown and the damage to the leaves of the horse chestnut. The frequency of observations was 10 days. The first observations were made on June 20, 2023. An assessment of the vital condition of the trees showed that a significant number of damaged plants were recorded in the arboretum of the Orel SAU and Victory Boulevard (73% and 85%, respectively). There are no completely healthy or dead horse chestnut plants on all the studied objects. As a result of the study, the effectiveness of the drug Locustin on the condition of the foliage of chestnut plants was established. The maximum protective effect from the use of the drug was noted in the early stages of the growing season (June). In comparison with the control variant, the degree of leaf damage on trees treated with Locustin reaches 2.5 times lower indicators of damaged leaf area than on control trees.