Control of Great ragweed (Ambrosia trifida) of Mutant N-29 Broth Filtrate of Streptomyces scopuliridis KR-001

Hwa-Sook Kwak1   Young-Sook Kim1   Jae-Deok Kim1   Kyoung-Soo Jang1   Kee Woong Park2   Kyong-mi Chon3   Jung-Sup Choi1,*   

1Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
2Chungnam National University, Daejeon 34134, Korea
3National Institute of Agricultural Sciences, RDA, Wanju 55365, Korea


Ambrosia trifida that is native to North America has been known as a noxious weed not only in Asia but also in the native areas, and it was designated as a plant to invasive alien weed by the Ministry of Environment in Korea. This study presents an experiment aimed for preventing the propagation of the A. trifida using a mutant N-29 broth filtrate of Streptomyces scopuliridis KR-001. The experiment applied the broth filtrate of the mutant N-29 to A. trifida in a greenhouse and in field condition. The results showed that the mutant N-29 broth filtrate demonstrates a complete herbicidal activity against A. trifida in the greenhouse condition after foliage treatment under all application rates for three leaf stages (Ls) of early (2-3 Ls), middle (4-5 Ls), and late (7-8 Ls) ones. Also, it showed a strong herbicidal effect on the naturally grown condition (5-6 Ls) and the effect lasted for as long as 21 days. The main symptom of external manifestation was water soaked dots within 24 hours after treatment and continued to the appearance of chlorosis and proceeded to leaf burn-down, ultimately defoliations to dead plants. Our results shows that the mutant N-29 broth filtrate can be utilized as a natural and eco-friendly herbicide against A. trifida that is one of the broad-leaved weeds disturbing ecosystems.

Figures & Tables

Fig. 2. Herbicidal activity of foliar application of the mutant N-29 broth filtrate of KR-001 to with middle leaf stage (4-5Ls) in a greenhouse condition. The representative pictures were taken 15 days after foliar application. DAT: Days after treatment.