Invasive plants in weed flora in organic agriculture

Organic agriculture means ecological production management system that promotes and enhances biodiversity, cycling of matter and biological soil activity with minimal using of materials which are not origin from the farm. Weed control in this way of agricultural production is a complex task that further complicates the presence of invasive plants in the weed flora. Highly efficient physiological and reproductive capacities of invasive species give them an advantage over native species. The analysis of weed flora in the organic production of buckwheat, soybeans, wheat, corn, cabbage and lettuce showed that Ambrosia artemisiifolia, Cirsium arvense and Senecio vulgaris are characterized as invasive plants for Europe region, and Amaranthus retroflexus, Amaranthus blitoides, Datura stramonium, Erigeron canadensis, Portulaca oleracea and Sorghum halepense are labeled as invasive plants for Vojvodina Province. Knowledge and analysis of biological and ecological characteristics of invasive species are a priority in selecting the measures of weed control in growing crops in conditions of organic agriculture.