Abstract: Based on the analysis of the control effects of chemical and biological fungicides and their residues in medicinal materials, we screened out the best fungicides for ecological control of Alisma plantago-aquatica, and provided basis for green and sustainable production and establishing ecological planting base of Alisma plantago-aquatica. The results showed that the control effect of Kasugamycin was the best after 2 times of application, followed by Triadimefon, Bordcaux mixture and Polyoxin; Under the experimental dosage, there was no Kasugamycin residue in the medicinal materials at the time of harvest, and there was still a small amount of Triadimefon and Bordcaux mixture residue; Triadimefon has a long safety period, and the residue of Bordcaux mixture is difficult to degrade. Therefore, the long-term use of the two chemical pesticides is easy to affect the medicinal materials and the environment, resulting in security risks. We integrated the control effect and residue analysis results and found that Kasugamycin has good control effect and rapid degradation. It is a safe fungicide for Alisma plantago-aquatica production and has good popularization and application value.

Key words: biological fungicides, Alisma plantago-aquatica white spot disease, fungicide selection, security risks