Document Type : Weed Science
Authors
Abstract
In the present research, phenology of Russian knapweed (Acroptilon repens) was studied in an experimental nursery in Department of Weed Research, Iranian Research Institute of Plant Protection, based on growing degree day. The Results indicated that emergened plant of root occurred in 0, to 3823.3 growing day-degree and 8 phenological stages were recorded. These stages were shoot emergence, rosette conversion to main stem, production of secondary shoot, main stem branching, booting, flowering, flower drying, shoot drying. On based of obtained results the production of Russian knapweed seeds was synchronic with booting. The seeds turned into milky stage and maturity 10 days and 30 days afterward. In general, Russian knapweed is a weed with long growth period. In this study, annual period of shoot growth took about 41 weeks (10 months).
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