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首页> 外文期刊>Plant Disease >Effects of propamocarb hydrochloride on mycelial growth, sporulation, and infection by Phytophthora nicotianae isolates from Virginia nurseries.
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Effects of propamocarb hydrochloride on mycelial growth, sporulation, and infection by Phytophthora nicotianae isolates from Virginia nurseries.

机译：盐酸丙霉威对弗吉尼亚州苗圃中疫霉疫霉菌丝体生长，孢子形成和感染的影响。

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Propamocarb hydrochloride is a systemic fungicide commonly used for control of Phytophthora diseases of nursery crops. Here we report on the effect of this compound on different growth stages of Phytophthora nicotianae, a major pathogen of numerous herbaceous and some woody ornamental plants. A total of 71 isolates were assayed for sensitivity to propamocarb at two concentrations of 1.8 mg/ml (label rate) and 10 mg/ml using clarified V8 agar as a base medium. All isolates grew at 10 mg/ml with the most sensitive isolate having 34.8% relative growth compared with growth on nonamended medium. Nine isolates were selected and further tested for mycelial growth at 0, 1, 10, 25, 50, and 100 mg/ml, and for sporangium production, zoospore motility, and germination at 0, 5, 50, 500, 5,000, and 50 000 micro g/ml. EC50 values ranged from 2.2 to 90.1 mg/ml for mycelial growth, 133.8 to 481.3 micro g/ml for sporangium production, 88.1 to 249.8 micro g/ml for zoospore motility, and 1.9 to 184.6 micro g/ml for zoospore germination, respectively. In addition, 17 selected isolates were evaluated for propamocarb sensitivity on Pelargonium x hortorum cv. White Orbit. Two days after seedlings were treated with propamocarb at 3.6 mg/ml, they were inoculated by either inverting one 5-mm-diameter plug of a 3-day-old culture or applying a 10- micro l drop containing 20 zoospores onto each cotyledon. Propamocarb hydrochloride provided good protection of geranium seedlings from zoospore infections but not from mycelial infections. These results suggest that this fungicide must be used preventively for Phytophthora disease management and that mycelial growth may not be the most reliable measurement to determine the development of fungicide resistance to this compound in Phytophthora species at production facilities and in the landscape..
机译：盐酸丙卡巴威是一种系统性杀菌剂，通常用于控制苗圃疫霉菌病。在这里，我们报告了该化合物对烟草疫霉菌（Phytophthora nicotianae）不同生长阶段的影响，疫霉菌是许多草本植物和一些木质观赏植物的主要病原体。使用澄清的V8琼脂作为基础培养基，在1.8 mg / ml（标记率）和10 mg / ml的两种浓度下，共检测了71种分离物对丙虫威的敏感性。所有分离株均以10 mg / ml的速度生长，最敏感的分离株相对于未改良培养基的生长具有34.8％的相对增长。选择了9种分离株，并进一步测试了0、1、10、25、50和100 mg / ml的菌丝体生长，以及0、5、50、500、5,000和5,000时孢子囊的产生，游动孢子运动和萌发000微克/毫升菌丝体生长的EC50值范围为2.2至90.1 mg / ml，孢子囊产生的EC50值范围为133.8至481.3 micro g / ml，游动孢子活力的EC50值范围为88.1至249.8 micro g / ml，游动孢子萌发的EC50值范围为1.9至184.6 micro g / ml。此外，评估了17个分离株对天竺葵x hortorum cv的杀虫威的敏感性。白色轨道。用3.6 mg / ml的杀虫威处理幼苗两天后，通过倒置一个直径为3天的5毫米直径的栓子或在每个子叶上施加10微升的含20个游动孢子的液滴进行接种。盐酸丙溴威可为天竺葵幼苗提供良好的保护，使其免受游动孢子感染的侵害，但不受菌丝体感染的侵害。这些结果表明，该杀真菌剂必须预防性地用于疫霉菌疾病的控制，并且菌丝生长可能不是确定生产设施和环境中疫霉菌中该化合物对这种化合物产生抗药性的最可靠方法。

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