Within this station, three experimental variants were initiated that targeted the preceding culture. Therefore, the variants studied were: V1 maize in monoculture; V2 corn after sunflower; V3 corn after wheat. Barber-type soil traps were used to collect biological material, they worked continuously from April to July 2021, where a number of 5 collections were made for each variant. Barber traps consist of plastic containers of approx. 10-12 centimeters high and about 8-10 centimeters in diameter in which I used a salt solution (NaCl) with a concentration of about 20% as fixing liquid. Six traps were used for each experimental variant. Samples were collected at 12-15 day intervals when we changed the fixative – saline solution, replenished or, if necessary, replaced. The collected species were cleaned of all plant remains, other impurities, and then the coleoptera species were selected separately, and with the help of determinants they were identified. The structure, dynamics and abundance of coleopteran species were then determined according to each experimental variant, and the most frequently collected were: Tanymecus dilaticollis, Epicometis hirta, Coccinela 7- punctata, Harpalus calceatus, Harpalus distinguendus Formіcomus pedestrіs, Phyllotreta vittula, Opatrum sabulosum and Pentodonidiota.

In order to maintain biodiversity on intensively exploited agricultural land, the monitoring of harmful and useful species is extremely important, as it provides information on the quality of the land and, why not, can provide predictions on the stability of agroecosystems. The observations regarding the structure of the arthropod entomofauna were made between April and July in the year 2021 in a corn crop in the town of Ghigoiesti. The research carried out aimed to determine the structure and composition of the entomofauna, its abundance and diversity as well as their behavior in the maize crops in the station under observation, and the research was based on the use of Barber-type soil traps, a total of 6, placed in 3 in a row, which have as fixing solution a salt solution (NaCl) with a concentration of 20% for each of the three variants studied. The collected material is represented by species belonging to the arthropod fauna that systematically fall into the following orders: Coleoptera, Hymenoptera, Orthoptera, Diptera, Arachnida s.a.