The efficacy and translocation behavior of carabrone in wheat and cucumber

Carabrone, which has high antimicrobial activity and broad disease prevention spectrum, is expected to be developed as a new type of plant source fungicide. In the current study, the absorption and translocation behavior of carabrone in plants were clarified Potted monocotyledonous wheat and dicotyledonous cucumber were chosen as the tested plants. The results showed that carabrone at 1000 mg/L exhibited over 65% efficacy against wheat and cucumber powdery mildew when applied by foliar spray or irrigation, and over 60% and 45% efficacy obtained against wheat take-all and cucumber fusarium wilt respectively when applied by irrigation. In contrast, no efficacy was observed against the two root diseases when carabrone was applied by foliar spray. Moreover, the absorption and translocation behavior of carabrone in wheat and cucumber were further determined by the high-performance liquid chromatography (HPLC) method. The result showed that carabrone in both soil and water could be absorbed and transported upward readily by wheat and cucumber, especially in water. However, no carabrone was detected in the root samples within 72 h when it was sprayed on the leaves of wheat and cucumber. The results suggest that carabrone could be readily absorbed by the roots of wheat and cucumber and transported upward but could not be absorbed by their leaves and transported downward. This information could provide guidance for field use and increase our understanding of the action mechanism of carabrone.