Herbicidal Activity of KRA16-334 Broth Filtrate on Sicyos angulatus

Umurzokov  Mirjalol1   Jung Sup Choi2   Ruziev  Farrukh1   Young Sook  Kim1   Kwang Min Cho3,*   Kee Woong  Park1,3,*   

1Department of Crop Science, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 34134, Korea
2Eco-friendly and New Materials Research Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
3Daeseung Bio Farm Research Center, Daejeon 34127, Korea

Abstract

Burcucumber (Sicyos angulatus) is one of the first ecosystem disturbing plants designated by the Ministry of Environment, Republic of Korea in 1998 and is known to be distributed in one of the largest area among ecosystem disturbing plants. This study was conducted to control S. angulatus with soil Streptomyces drozdowiczii strain KRA16-334. The broth filtrate of KRA16-334 was applied to burcucumber as pre-and post-applications in a greenhouse and just post-application in field conditions. The results showed that KRA16-334 suppressed the germination rate of S. angulatus by 42 to 100%. Foliar applications of the KRA16-334 broth filtrate showed the highest effectiveness at the second leaf stage of S. angulatus (98-100%). The control efficiency of KRA16-334 declined as growth stages of the plant passed. Experiments in the field conditions witnessed that there were injury signs (contact activity as part of the plants became desiccated) on the leaves of the treated weeds on the second day after treatment. The control efficacy in the field was relatively lower (85%) compared with the greenhouse conditions (100%). S. angulatus reaction to the application of KRA16-334 was stronger than glyphosate and inferior than glufosinate-ammonium at the x1 rate application. Our results show that the KRA16-334 broth filtrate can be used as a natural herbicide against S. angulatus an-ecosystem disturbing plant in Korea. However, further studies such as culturing methods, agitations, or mutation of the broth filtrate will be required to increase secondary metabolite activities.

Figures & Tables

Fig. 1. Herbicidal activity of pre-emergence application of the KRA16-334 broth filtrate at x1, x1/2, x1/4, and x1/8 application rates to in greenhouse. Vertical bars represent means of three replications.