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The aim of this study was to evaluate the heterogeneity of the incidence of individual weed species on a selected experimental fi eld. This fi eld was situated in the cadastre of the village Žabčice (South Moravian Region, Czech Republic). To evaluate the intensity of weed infestation, a fi eld experiment was established. In 2011, altogether 33 weed species were identifi ed in a stand of spring barley. In the next year, the total number of weeds in a stand of winter wheat was 22. Basing on results of the evaluation of infestation heterogeneity it was possible to detect the following trends: The fi rst one concerned the incidence of signifi cantly dominant species Chenopodium album and Veronica hederifolia in stands of spring barley and winter wheat, respectively. The second one expressed the incidence of the so-called sub-dominant species. Regarding the character of the incidence of these weed species it would be suitable to kill them by means of a targeted application of herbicides. Finally, the third trend concerned the incidence of that group of weeds that occurred in the major part of the experimental plot but in low numbers only. The abundance of these species was minimal and the total number of weed plants did not exceed the limit of 100 specimens. This group of weeds involved also those species that were markedly more frequent on plots situated closer to the margin of the experimental fi eld. The targeted application of herbicides can be performed on plots with a lower level of weed infestation; another possibility, however, seems to be a targeted intervention that helps to control the incidence of a certain weed species and/or that is performed along the margin of the fi eld where the diff erent weed species are more frequent.
The aim of this study was to evaluate the heterogeneity of the incidence of individual weed species on a selected experimental fi eld. This fi eld was situated in the cadastre of the village Žabčice (South Moravian Region, Czech Republic). To evaluate the intensity of weed infestation, a fi eld experiment was established. In 2011, altogether 33 weed species were identifi ed in a stand of spring barley. In the next year, the total number of weeds in a stand of winter wheat was 22. Basing on results of the evaluation of infestation heterogeneity it was possible to detect the following trends: The fi rst one concerned the incidence of signifi cantly dominant species Chenopodium album and Veronica hederifolia in stands of spring barley and winter wheat, respectively. The second one expressed the incidence of the so-called sub-dominant species. Regarding the character of the incidence of these weed species it would be suitable to kill them by means of a targeted application of herbicides. Finally, the third trend concerned the incidence of that group of weeds that occurred in the major part of the experimental plot but in low numbers only. The abundance of these species was minimal and the total number of weed plants did not exceed the limit of 100 specimens. This group of weeds involved also those species that were markedly more frequent on plots situated closer to the margin of the experimental fi eld. The targeted application of herbicides can be performed on plots with a lower level of weed infestation; another possibility, however, seems to be a targeted intervention that helps to control the incidence of a certain weed species and/or that is performed along the margin of the fi eld where the diff erent weed species are more frequent.
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