Untersuchungen zur chemischen Bekämpfung der Beifußblättrigen Ambrosie (Ambrosia artemisiifolia L.) in Sonnenblumen und Körnerleguminosen

Abstract

Only a limited spectrum of active substances is available for weed control in leguminous plants and sunflowers. Since 2007 the official plant protection service in Brandenburg conducts herbicide field trials in these crop species in the region around Drebkau for the investigation of practicable approaches for control of Ambrosia artemisiifolia. In field pea trials control rates of up to 75% were achieved under favourable conditions with pendimethalin in pre-emergence application and bentazone used as post-emergence application. For the cultivation of lupins only pre-emergence herbicides are registered. The combination of the active substances S-metolachlor and terbuthylazin as a commonly used mixture reached only up to 50% control in case of high weed cover of A. artemisiifolia. Due to the high density of A. artemisiifolia plants, a harvest of the crop often requires preceding desiccation. Likewise, the performance of authorised herbicides in sunflowers is insufficient. In special varieties tolerating tribenuron, splitted application of two times 30g Pointer SX enabled control rates of 70 to 80%. In the region concerned cultivation of grain legumes and sunflowers is limited in areas with high coverage rate of A. artemisiifolia.

Keywords

• field pea
• lupine
• herbicide
• tribenuron tolerant