Fedina L.A., Malysheva S.K., Kolyada A.S.
Vestnik IrGSHA 2023; (114): 42-48
The article provides information about the discovery of atypical specimens of ragweed ( Ambrosia artemisiifolia L.) in the south of Primorsky Krai. The purpose of the study is the morphological characteristics of the underground part of the new ragweed biomorph in the local community. Currently, the formation of a secondary range of this species continues in the south of the Russian Far East. The modern isolated center of its distribution began to form here in the second half of the last century. The first pockets of ragweed in the Primorsky Territory were identified by the State Plant quarantine Inspectorate in the Spassky district in 1963. The settlement of anthropogenically transformed and specially protected protected areas with ragweed is an urgent phytosanitary problem in the Primorsky Territory. In 2018, during a survey of the forest nursery of the Primorsky State Agricultural Academy, a plantation overgrown with ragweed was discovered, in which individual individuals were distinguished by smaller sizes, a spherical crown, thick pubescence of the stem and leaves. In total, 9 plants of ragweed with similar signs were found. The study of the underground part showed that these specimens, unlike the usual rod-root system characteristic of this species, have an underground plagiotropic section of the main shoot, on which additional aboveground shoots have formed and the intensive formation of numerous accessory roots occurs, which resembles the rhizome system of the perennial species Ambrosia psilotachya DC. Further morphophenotypic monitoring of Ambrosia artemisiifolia populations is needed to detect such morphological changes.
