PT  - JOURNAL ARTICLE
AU  - Winkler, Jan
AU  - Zelená, Věra
TI  - Occurence of Northern Willowherb (Epilobium ciliatum Rafin.) in crop stands and fallow lands
DP  - 2015 Jul 18
TA  - Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
PG  - 75--80
VI  - 52
IP  - 1
AID - 10.11118/actaun200452010075
IS  - 12118516
AB  - Northern willowherb (Epilobium ciliatum Rafin.) is a naturalized allien species occurring almost all over the territory of the Czech Republic. Evaluation of weed vegetation by means of methodology developed by Kühn (1982) took place on selected fields located in the cadastral area of Olomouc-Holice. All in all, 1360 phytosociological relevés were recorded from 1997 to 2001, on the average, one relevé per 2,7 ha. In addition to it, the occurrence of Epilobium ciliatum was recorded within an experiment with green fallow lands at Kroměříž in 2002. Every individual plant species had been assigned data on its cover and growth phases according to the BBCH scale (an universal growth phases scale for crops and weeds, Hess et al., 1997). The frequency of occurrence of Epilobium ciliatum in cereal crops is so low that it is negligible from the economic point of view and moreover, the plant is not capable of any reproduction there. In other crops (such as sugar beet, maize or alfalfa), Epilobium ciliatum either does not occur at all or its occurrence is very rare. On arable lands, it is capable of reproducing itself in rape and caraway only. In view of the fact that the frequency of its occurrence on fallow lands was very low, we do not have available a sufficient amount of data from which a general rule governing its occurrence and cover rate could be derived. Even though the agricultural lands apparently only started to be invaded by the northern willowherb, the plant is already capable of reproducing itself to some extent, which fact is of essential importance for the increase of its significance in the future.