Abstract
Some site-specific fungicides were usually mixed with synergistic agrochemicals to prolong the active life and lower the risk of the resistance. As an important composition in Bordeaux mixture, pellouxite is viscous and may help fungicides increase the efficacy and lower the risk of resistance. The aim of this work was to investigate the effects of pellouxite on the efficacies and lasting periods of thiophanate-methyl (TM) and tebuconazole (TEB) for the control of Glomerella leaf spot (GLS) in apple leaves. Fungicide efficacy was determined by the detached leaf inoculation method. Results showed adding pellouxite increased the efficacies of TM and TEB with the increase rates ≥33% at 21 and 28 days after treatment. Additional analysis suggested there was a synergistic response in the control of apple GLS when TM or TEB was mixed with pellouxite. To illustrate this effect, the fungicide residue dynamic in apple leaves and the sensitivity of Glomerella cingulata to fungicides were investigated by the UPLC–MS/MS and mycelia linear growth rate method, respectively. Results showed adding pellouxite increased the DT50 values for the active metabolite of TM as well as TEB and also lowered their EC50 values. These suggested adding pellouxite increased their lasting periods and also enhanced their inhibitory effects on the growth of G. cingulata. In conclusion, adding pellouxite to two fungicides can increase and prolong their efficacy, which may lower their application rate and also the risk of the resistance.
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This research was funded by the National Key Basic Research Program of China (2012CB126302), the China Agriculture Research System (CARS-28) and the Taishan Scholar Construction Project of Shandong Province.
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Wang, Y., Li, P., Zhen, H. et al. The promotion of thiophanate-methyl and tebuconazole for the continuous control of Glomerella leaf spot in apple leaves by adding pellouxite as a synergistic reagent. J Plant Dis Prot 124, 631–639 (2017). https://doi.org/10.1007/s41348-017-0102-z
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DOI: https://doi.org/10.1007/s41348-017-0102-z