辣椒种质资源对疫霉病的抗病性评价及杀菌剂敏感性分析

doi:10.12190/j.issn.2096-1197.2022.05.10

Abstract

Abstract:

【Objective】To assess the degree of Phytophthora resistance of pepper germplasm resources and examine the indoor antifungal activity of common chemical agents against Phytophthora capsici，in order to provide guidance for the prevention and control of Phytophthora.【Methods】The resistance of 28 pepper germplasm resources to Phytophthora capsici was evaluated by root inoculation. The sensitivity of Phytophthora capsici S90 to 16 common fungicides in the market was analyzed by mycelial growth rate method.【Results】The disease resistance of different pepper germplasm resources was significantly different，and the disease index was 0-100. Among them，the disease index of C164，C186，C167，C189，Beixing No.1 and Beixing No. 6 was 0，showing high resistance，accounting for 21.43% of the total resources. There were 1 medium resistant and 21 highly susceptible materials，accounting for 3.57% and 75.00% of the total resources，respectively. Among the 16 fungicides，the suspension of 32% pyraclostrobin·fluopicolide had the highest inhibitory activity of P. capsici S90，with EC₅₀ value at 6.935 0 mg/L. The EC₅₀ values of iprodione，carbendazim，myclobutanil，ethylicin and pyraclostrobin were 21.504 7 to 93.587 8 mg/L. The EC₅₀ values of other fungicides were all greater than 100 mg/L，among which，fluopyramotri·floxystrobin and chlorobromoisocy anuric acid had no inhibitory effect on P. capsici S90.【Conclusion】In the tested pepper germplasm resources，there were six varieties with high Phytophthora capsici resistance. Among the 16 fungicides tested，the suspension of 32% pyraclostrobin·fluopicolide had the highest inhibitory effect on P. capsici S90. Iprodione，carbendazim，myclobutanil，ethylicin and pyraclostrobin also had some inhibitory activities that could be used as effective fungicides for controlling Phytophthora.

Key words: Pepper, Germplasm resources, Phytophthora capsici, Resistance evaluation, Fungicide susceptibility

CLC Number:

S436

SUN Pingping, LI Zhengnan, LIU Xin, ZHANG Lei, WANG Yong, FU Chongyi. Resistance evaluation of pepper germplasm resources against pepper Phytophthora and fungicide sensitivity analysis on Phytophthora capsici[J].Journal of Northern Agriculture, 2022, 50(5): 67-72.

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URL: https://journal30.magtechjournal.com/bfnyxb/EN/10.12190/j.issn.2096-1197.2022.05.10

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Resistance evaluation of pepper germplasm resources against pepper Phytophthora and fungicide sensitivity analysis on Phytophthora capsici

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