Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Management of some noxious dicotyledonous weeds in rape crops in southern Romania.

Abstract

In recent years, the importance of winter rape (Brassica napus) has increased considerably because it provides the raw material for industry, representing a renewable alternative to fossil energy sources. The spectrum of weeds in rape crops has a specific characteristic and it is in constant change. These developments are more obvious if they are studied for a long time, on large agricultural areas, allowing conclusions to be drawn regarding the emergence of new species of weeds or changes in the importance of the already existing weeds. Our observations were made in 2015 and 2016 on rape crops in southern Romania. The conducted research showed that some weeds, such as a few species in the genus Veronica, classified as 'ephemeral', became dominant in the rape crops. We also found that Galium aparine has become more damaging, having a much higher density in rape crops. In this context, the control of these species, both native and alien, is required due to the high cost of production correlated with decreased productivity, and because rape is grown in dense rows that do not enable the mechanical works. The paper presents data on the management of the noxious weeds Veronica persica (alien), Veronica hederifolia (native), and Galium aparine (native) by integrating agro-technical measures with products for plant protection.