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Intercropping, or the use of different aspects of the interaction between organisms in ecosystems, can be classified as an ecological method that limits harmful human interference in the environment, especially the consumption of chemicals. The impact of intercropping carrot with coriander Coriandrum sativum L. and summer savory Satureja hortensis L. on the occurrence of select carrot pests was estimated in the years 2010-2011. Intercropping had a significant effect on the decrease of the number of roots damaged by carrot rust fly Psila rosae. During harvest, the least number of damaged roots was observed in combination with summer savory S. hortensis L. The number of carrot psyllid Trioza viridula Zett. and aphids on carrot leaves and roots damaged by nematodes was significantly lower on plots where carrot was intercropped. Intercropping both herbs had a positive influence on the number of beneficial insects. In all of the years of the study, the highest number of Coccinellidae and Syrphidae were observed on plots where carrot was intercropped with coriander.

A study of the influence of intercropping broad bean with phacelia on the occurrence of weevils and broad bean beetles was conducted in the years 2006-2009. The harmfulness of Sitona spp. beetles feeding on the leaves (the number of U-shape notches and the number of damaged leaves) and the harmfulness of the larvae, as well as the feeding on the broad bean root nodules was taken into account. The harmfulness of the broad bean beetle was determined by assessing the condition of the seeds. The influence of phacelia on the presence of weevils (Sitona) and broad bean beetles (Bruchus rufimanus) as broad bean pests was not observed. A smaller amount of broad bean seeds damaged by the broad bean beetle was determined only in some of the years of the study in the plots in which the phacelia was intercropped with broad bean.