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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (7): 1915-1925.doi: 10.16420/j.issn.0513-353x.2024-0425

• Plant Protection • Previous Articles     Next Articles

Detection and Risk Resistance Assessment of Botrytis cinerea on Tomatoes to Prochloraz

REN Xiaoyan, JIA Yiwei, WANG Luwei, LI Tianshuang, LIU Haixia, YAO Yanping, WANG Chunwei, and WANG Meiqin*()   

  1. College of Plant Protection,Shanxi Agricultural University,Taigu,Shanxi 030801,China
  • Received:2025-02-20 Revised:2025-04-21 Online:2025-07-23 Published:2025-07-23
  • Contact: and WANG Meiqin

Abstract:

In order to determine the resistance level and risk of Botrytis cinerea to prochloraz. In this study,the mycelial growth rate was used to establish sensitivity baseline and detect the resistance level of B. cinerea to prochloraz in different regions of Shanxi Province. The risk of resistance of B. cinerea to prochloraz was investigated by chemical acclimation and ultraviolet induction,and the genetic stability and biological characteristics of the resistant mutants were studied,and the cross-resistance between prochloraz and commonly used agents was determined. The results showed that the 89 isolates of B. cinerea isolated from areas where prochloraz had never been used were established with the sensitivity baseline of(0.1297 ± 0.0765)μg · mL-1. A total of 116 isolates of B. cinerea were isolated from various parts of Shanxi Province,and 6 isolates with low resistance were detected with a resistance frequency of 5.17%. Three medium-resistant strains and one low-resistance strain were obtained by chemical acclimation and ultraviolet induction,and the resistance could be stably inherited after 8 generations,and the biological characteristics of the resistant mutant were lower than those of the parental strains. There is no cross-resistance between prochloraz and tebuconazole,fluopyramide,fludioxonil,pyrimethanil,iprodione and chlorothalonil. In conclusion,the B. cinerea in Shanxi Province was sensitive to prochloraz and had a low resistance level,while the resistant strains of prochloraz to B. cinerea were not easy to form dominant strains,and belonged to the low to medium resistance risk. In production,agents with different mechanisms of action can be used alternately to prevent and control tomato gray mold and delay the occurrence of prochloraz resistance of B. cinerea.

Key words: tomato, Botrytis cinerea, prochloraz, sensitivity baseline, resistant detection, risk of resistance