Herbicidal Characteristics of Mixture of Mevalocidin and Clomazone at Foliar Application

Jin-Seog Kim1,*   Bo Gwan Kim1   Jung-Sup  Choi1   Eun Ae Kim1   Jae Deok Kim1   Young Kwan  Ko1   

1Research Center for Eco-Friendly New Materials, Bio & Drug Discovery Division, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea


This study was conducted to know that how the herbicidal interactions and its characteristics were exhibited in various plants, when the clomazone inhibiting the non-mevalonate pathway in chloroplast was mixture-treated with the mevalocidin which was supposed to inhibit the mevalonate pathway in cytoplasm. The herbicidal activity of mevalocidin in Lemna paucicostata, which its major symptoms were frond disorganization, membrane breakdown and necrosis (grey colorization), was not significantly increased or decreased by the clomazone inducing the whitening and growth inhibition, showing an interaction near additive effect. In the case of foliar treatment to various plants, the herbicidal interactions of two herbicide were different according to plant species and herbicidal symptoms. For example, synergistic effect was occurred in Echinochloa spp. and Panicum dichotomiflorum, additive effect in Orysa sativa, and antagonistic effect in Solanum nigrum and Calystegia japonica. Particularly the degree of synergistic interaction in Echinochloa spp. was higher in the condition of vigorous growth (in a higher growth temperature) than in relatively lower growth. On the other hand, synergistic effect was occurred in wilting and desiccation, additive effect in whitening, and antagonistic effect in growth inhibition. In average, the mixture of clomazone and mevalocidin did not increase the total herbicidal efficacy as much as expected, but tended to broaden the herbicidal spectrum. In this experiment, various interactions observed differently according to plant species and herbicidal symptoms would be related to chemical absorption, translocation, metabolism, binding affinity at action sites, cross-talks of metabolic biosynthesis pathway in cell, cultural environmental factors, and so on. Therefore, an additional research would be needed for clarifying the underlying interaction mechanisms.

Figures & Tables

Fig. 1. Effects of mevalocidin+clomazone mixtures on the growth inhibition of at 6 d after treatment.