The species composition of weeds in sunflower crops in the steppe zone of the Krasnodar Territory

Abstract

In sunflower crops cultivated in the steppe zone of the Krasnodar Territory, 92 species of weeds were identified. The core of the weed component of agrocenoses consists of 2 especially active species - Amaranthus retrof-lexus L. and Chenopodium album L., 5 highly active species - Ambrosia artemisiifolia L., Convolvulus arvensis L., Abu-tilon theophrasti Medik., Echinochloa crusgalli (L.) Beauv., Persicaria maculosa S.F. Gray, 2 medium-active species Cir-sium setosum (Willd .) Bess. and Vicia cracca L. and 2 fairly active species Sinapis arvensis L. and Lathyrus tuberosus L. These are the types that should be paid special attention to while developing protective measures. In addition, 22 inactive species and 59 inactive species were identified, the presence of which in sunflower crops is due to a decrease in the level of technology of this crop cultivation. The territorial totality of weeds of the ecotope of segetal habitats is a segetal flora, one of the subdivisions of which is the partial flora of the ecotope under the cultivation of sunflower culture. The species composition of the segetal flora is characterized by stability, therefore it can be predicted for a certain time perspective. The activity of species changes with the change of crops in the crop rotation scheme, which significantly increases the role of phytosanitary monitoring.