Abstract: 【Objective】To screen fungicides that could effectively control potato aerial stalk rot.【Methods】Collecting commercial fungicides for the bacterial diseases control,and using the bacteriostatic circle method to indoor test its virulence on potato aerial stalk rot fungi.【Results】The three fungicides of 80% ethyl allicin,0.3% tetramycin,and 1.8% caprylate acetate had an inhibitory effect on potato aerial stalk rot bacteria,and the EC₅₀ values were 140.72,5.73,and 696.92 μg/mL;The qualitative and quantitative screening of the synergistic determination test of the mixed agents was carried out on these three agents,and the qualitative determination results showed that the mixture volume ratio of allicin and tetramycin was 3∶7,5∶5,6∶4,7∶3,the mixed volume ratio of hexamectin acetate and tetramycin was 6∶4,7∶3,8∶2,9∶1,and the mixed volume ratio of hexamectin acetate and ethyl allicin was 2∶8,4∶6;the toxicity ratio was greater than 1,and it had synergistic effect;quantitative measurement results showed that the inhibitory effect was best when the volume ratio of tetracycline and ethyl allicin was 7∶3,and the EC₅₀ is 0.000 4 μg/ mL.The test results of the safety of different germicides on potato germination showed that high concentrations of tetramycin,ethyl allicin,and caprylate acetate fungicides had an inhibitory effect on potato germination.【Conclusion】In the potato production, tetracycline,ethrin and caprylate acetate were the first choice for the control of potato aerated stem rot,and suggested to use their prescribed concentration,so as to effectively control the disease and prevent the bacteria from resistance developing.

Key words: Potato, Aerial stem rot fungi, Bacteriostatic method, Indoor virulence determination