In 2024, studies were conducted in the Amur Region to determine the distribution patterns of pests depending on the species composition and density of weeds. This article presents the results of a study of the insect fauna of pests in soybean crops infested with Siberian cocklebur (Xanthium sibiricum Patrin ex Widder). Eight species of insect pests were identified. Xanthium sibiricum has a significant impact on the spread of Monolepta quadriguttata (Motschulsky, 1860). Pest density in infested crops is three times higher than in weed-free fields. Xanthium also has a significant impact on the spread of the soybean moth and the meadow borer. The density of the codling moth in soybean crops infested with cocklebur doubles, while the density of the meadow borer increases by approximately one and a half times. The author also noted that the covering of soybean plants by weeds that have grown to the upper tier hinders the ventilation of crops and provokes the development of fungal diseases.

Anisimov Nikolay S.

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