Sensitivity of Phomopsis asparagi to Difenoconazole and Field Disease Control Efficacies of Three Fungicide Products
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摘要:
目的 明确芦笋茎枯病菌对苯醚甲环唑的敏感性及3种杀菌剂对芦笋茎枯病的田间防效。 方法 采用菌丝生长速率法测定采集分离自福建、河南、湖南、山西、山东的132株芦笋茎枯病菌对苯醚甲环唑的敏感性,并分析10%苯醚甲环唑WG、35%氟吡菌酰胺·戊唑醇SC和325 g·L-1嘧菌酯·苯醚甲环唑SC 3种杀菌剂对芦笋茎枯病的田间防效。 结果 供试的132株芦笋茎枯病菌对苯醚甲环唑的有效抑制中浓度EC50在0.010 8~2.654 8 μg·mL-1,其平均值为(0.6934±0.0441)μg·mL-1。供试菌株对苯醚甲环唑的敏感性频率分布不符合正态性分布。福建省的供试菌株与山东省、湖南省的供试菌株对苯醚甲环唑的敏感性差异达显著水平(P < 0.05),同一省份内的供试菌株个体间对苯醚甲环唑的敏感性差异也较大。田间药效试验结果表明,10%苯醚甲环唑WG 135.00 g·hm-2两年试验对芦笋茎枯病的防效分别为75.60%和75.91%,而35%氟吡菌酰胺·戊唑醇SC 118.13+118.13 g·hm-2的两年防效分别为82.08%和82.32%,325 g·L-1嘧菌酯·苯醚甲环唑SC 84.38+135.00 g·hm-2的两年防效分别为82.74%和83.23%,两者的防治效果均显著优于10%苯醚甲环唑WG 135.00 g·hm-2的防治效果(P < 0.05)。 结论 田间存在芦笋茎枯病菌对苯醚甲环唑的敏感性下降的亚群体;氟吡菌酰胺·戊唑醇SC和嘧菌酯·苯醚甲环唑SC供试剂量对芦笋茎枯病的防治效果较好,对芦笋安全,可作为防治芦笋茎枯病的杀菌剂进行轮换使用。 Abstract:Objective The sensitivity of Phomopsis asparagi to difenoconazole, and the disease control efficacies of 3 fungicide products in the field were studied. Method Pathogen samples of the stem blight disease on asparagus were collected from Fujian, Henan, Hunan, Shanxi, and Shandong provinces and isolated to determine their mycelial growth on a medium laden with difenoconazole. The disease control efficacies of 3 fungicide products, i.e., (a) 10% difenoconazole WG, (b) 35% fluopyram+tebuconazole SC, and (c) 325 g·L-1 difenoconazole+azoxystrobin SC, were assessed in the field. Result The EC50 of the 132 isolates to difenoconazole ranged between 0.010 8 μg·L-1 and 2.654 8 μg·mL-1 averaging (0.693 4±0.044 1)μg·mL-1. The data did not exhibit a normal distribution pattern. A significant difference in difenoconazole sensitivity was found between the isolates from Fujian and Shandong or Hunan (P < 0.05). Even the pathogen samples from a same province varied in their sensitivity toward the fungicide. The field test demonstrated that when (a) was applied at 135.00 g·hm-2 the disease severity was reduced by 75.60% in 2017 and 75.91% in 2018; when (b) was employed at 118.13+118.13 g·hm-2 the severity was lessened by 82.08% in 2017 and 82.32% in 2018; and, when (c) was used at 84.38+135.00 g·hm-2 the severity was decreased by 82.74% in 2017 and 83.23% in 2018. It indicated that the latter two applications were significantly more effective than the first one for the disease control (P < 0.05). Conclusion The non-normal distribution of the sensitivities to difenoconazole of the pathogen isolates from various localities suggested the existence of resistant subpopulations of P. asparagi in the field. Being safe to Asparagus officinalis, the application of either 35% fluopyram+tebuconazole SC or 325 g·L-1difenoconazole+azoxystrobin SC was recommended for the control of stem blight disease on asparagus. -
Key words:
- Phomopsis asparagi /
- difenoconazole /
- sensitivity /
- control efficacy
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表 1 全国5省的芦笋茎枯病菌对苯醚甲环唑的敏感性
Table 1. Sensitivity of P. asparagi isolates to difenoconazole at various localities in China
采集地
Sampling location菌株数
No. of isolate苯醚甲环唑EC50值EC50 for difenoconazole/(μg·mL-1) 菌株间变异系数Variation factor 范围Range 平均值Mean 福建Fujian 33 0.1098~2.6548 0.9184±0.1489a 24.2 河南Henan 24 0.1457~2.3317 0.7353±0.1170ab 16.0 湖南Hunan 20 0.0108~1.4228 0.5167±0.0864b 131.7 山西Shanxi 30 0.0275~1.9352 0.6727±0.1177ab 70.4 山东Shandong 25 0.0209~1.3868 0.5222±0.0833b 66.4 总计Total 132 0.0108~2.6548 0.6934±0.0441 245.8 注:表中数据为平均数±标准差。同列数据后无相同小写字母者表示经Duncan氏新复极差法检验在P = 0.05水平上差异显著。表 2~3同。
Note:Data are mean±SD. Different lowercase letters in the same column indicate significant difference at P = 0.05 level by Duncan’s new multiple range test. The same as Table 2-3.表 2 福建省芦笋茎枯病菌对苯醚甲环唑的敏感性
Table 2. Sensitivity of P. asparagi isolates to difenoconazole in Fujian
采集地
Sampling location菌株数
No. of isolate苯醚甲环唑EC50值EC50 for difenoconazole/(μg·mL-1) 菌株间变异系数
Variation factor范围Range 平均值Mean 东山县Dongshan 8 0.3351~2.6548 1.3737±0.3015a 7.92 云霄县Yunxiao 6 0.2977~2.2715 0.9965±0.2790a 7.63 新罗区Xiangcheng 4 0.1098~0.9685 0.5985±0.1921a 8.82 仙游县Xianyou 5 0.2462~1.4261 0.7596±0.1951a 5.79 涵江区Hanjiang 6 0.1635~1.2450 0.7024±0.1132a 7.61 晋安区Jin′an 4 0.3106~1.1908 0.7332±0.1866a 3.83 总计Total 33 0.1098~2.6548 0.9184±0.1489 24.2 表 3 3种杀菌剂对芦笋茎枯病的防治效果
Table 3. Efficacies of 3 fungicide products for controlling stem blight disease on asparagus in the field
活性成分
Active ingredients用量
/(g·hm-2)防治效果Curative efficacy/% 2017年 2018年 苯醚甲环唑Difenoconazole 45.00 68.83±0.94f 69.39±0.49e 67.50 72.75±0.61e 73.30±0.23d 135.00 75.60±0.14cd 75.91±1.11c 氟吡菌酰胺·戊唑醇Fluopyram+Tebuconazole 59.06+59.06 76.67±0.39c 76.61±0.40c 78.75+78.75 80.09±0.24b 79.46±0.36b 118.13+118.13 82.08±0.65a 82.32±0.41a 嘧菌酯·苯醚甲环唑Difenoconazole+Azoxystrobin 42.19+67.50 74.45±1.09de 77.55±0.43c 56.25+90.00 78.99±0.64b 79.34±0.75b 84.38+135.00 82.74±0.79a 83.23±0.63a -
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