In the years 1997 – 2006 weed infestation of Helianthus annuus was evaluated at 12 farms in the maize and sugar beat growing region, after forecrops: Triticum aestivum, Hordeum vulgare, Zea mays for corn and for silage, Beta vulgaris convar. vulgaris and Nicotiana tabacum. Aim was to observe development of weed infestation and effect of forecrop on weed infestation of Helianthus annuus. The main weed species were: Cirsium arvense, Persicaria spp., Echinochloa crus-galli, Elytrigia repens, Chenopodium spp.. Weed infestation of sunflower was not significantly influenced by forecrops but forecrops influenced weed species diversity.

weed infestation; sunflower; forecrop

Presentation: oral