广西3

Resistance of melon powdery mildew isolates to kresoxim-methyl in Guangxi and determination of its sensitivity to three fungicides

  • 摘要: 【目的】了解广西瓜类白粉病菌对醚菌酯的抗性水平、抗性菌株的分布和发展趋势,并筛选瓜类白粉病防治药剂,为瓜类白粉病的抗性预防及防治提供参考。【方法】2007~2012年从广西南宁、桂平、北海等地采集苦瓜、冬瓜、甜瓜、黄瓜和葫芦瓜白粉病菌样品,采用叶碟保湿培养法检测供试菌株对醚菌酯的抗药性,并选取高抗菌株测定其对多菌灵、肟菌酯和丙森锌的敏感性。【结果】供试的83个瓜类白粉病菌均已对醚菌酯产生了抗药性,抗性菌株主要集中在苦瓜白粉病菌,其抗性频率最高,为63.89%;在西葫芦上的抗性菌株频率最低,为6.67%。2007~2012年南宁市苦瓜白粉病菌对醚菌酯的抗性水平有所发展,高抗菌株群体已经形成。药剂筛选结果显示,对醚菌酯高抗的白粉病菌菌株对多菌灵有极高的耐药性,且对肟菌酯产生了交互抗性,但对丙森锌仍然敏感。【结论】广西瓜类白粉病菌对醚菌酯已产生较高的抗药性,生产中可与丙森锌交替使用防治瓜类白粉病。

     

    Abstract: ObjectiveThe resistance level, distribution and development of melon powdery mildew isolates to kresoxim-methyl in Guangxi were identified and effective alternative fungicides were screened to provide references for prevention and controlling of melon powdery mildew. MethodFrom 2007 to 2012, bitter gourd, wax gourd, muskmelon, cucumber and bottle gourd disease samples were collected from Nanning, Guiping, and Beihai, etc. Their isolates’ resistance to kresoxim-methyl were detected by leaf disk tests. Sensitivity of high-resistant isolates to carbendazim, trifloxystrobin and propineb were also analyzed. ResultThe results showed that 83 melon powdery mildew population produced resistance to kresoxim-methyl in varying degrees. Resistant isolates were mainly distributed in bitter gourd powdery mildew and their resistant fre-quency was the highest (63.89%), while bottle gourd isolates had the lowest resistant frequency (6.67%). The resistant level of bitter gourd powdery mildew against to kresoxim-methyl increased gradually from 2007 to 2012 in Nanning City, resulting in development of high-resistance population. Fungicide screening assay results indicated that powdery mildew isolates with highly resistant to kresoxim-methyl, were highly drug-fast to carbendazim and cross-resistant to trifloxystrobin, but was sensi-tive to propineb. ConclusionIn Guangxi, melon powdery mildew isolates were highly resistant to kresoxim-methyl and al-ternate use of propineb in the production process could be recommended.

     

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