In recent years, in the parks and gardens of urban and rural areas in Romania, the harmful species Coreus marginatus (Linnaeus, 1758) has been often observed. After analyzing the information set, we found that there is little information at the national and even international level about the phytophagous character and its host plants. Until recently, the species was not a problem. That's why we proposed that through the present work, we would see the causes that led to the increase in its population. Through our 2-year study, 2021-2022 in 4 places in western Romania, we noticed that the insect is present especially in areas with various plant species in warm springs and summers. From the findings, it is obvious that the species is frequent in great color variability, at a high and very high level/the analyzed plant (n=3; n=6) in the 2 urban localities compared to the rural localities, where it was present at a low and absent level (n= 1.0; n=0.0). The ornamental plants with host potential were identified as follows: Chaenomeles japonica, Rosa l., Lavandula sp., Magnolia liliiflora, Convallaria majalis but also spontaneous plants such as Cirsium arvense. Most specimens were found on Chaenomeles and Rosa, where both adults and nymphs were observed feeding on sap from leaves, stems, inflorescences or seeds from inflorescences. The warm sunny periods of the day are favorable for its activity. We can conclude that the species has harmful potential due to the population growth or widening of the range of host plants, but we suspect that it is also due to the high temperatures in the summer and the places protected from the wind in autumn.

Coreus marginatus, polyphagous, host plants, favorable conditions

biology

Presentation: poster