• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Fusarium oxysporum f. sp. cepae, the causal agent of Fusarium basal rot of onion: Biology, epidemiology and management.
【24h】

Fusarium oxysporum f. sp. cepae, the causal agent of Fusarium basal rot of onion: Biology, epidemiology and management.

机译：尖孢镰刀菌f。 sp。洋葱洋葱镰刀菌基腐病的病原体cepae：生物学，流行病学和管理。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The bulb onion (Allium cepae L.) is an important food crop having been used for over 5000 years. Fusarium oxysporum Schlecht. f. sp. cepae (Hanzawa) Snyder & Hansen ( F. o. cepae), the causal agent of Fusarium basal rot of onion bulbs, is present in most parts of the world where onions are grown and is a major disease problem of this crop. This pathogen causes up to 90% loss of seedlings, and 30% loss of stored bulbs. This dissertation reports research conducted on the biology, epidemiology and management of Fusarium oxysporum f. sp. cepae in Colorado.Three Vegetatively Compatible Groups of Fusarium oxysporum f. sp. cepae were identified in Colorado. One VCG has a wide ranging presence in Colorado, one is restricted to Delta County, and the third is present in Mesa County. Two additional VCGs identified are single isolate VCGs.Up to one hundred and thirty cfu's of Fusarium were present in each milliliter of irrigation water. Fusarium contaminated irrigation water can infest fields previously free of F. o. cepae. Care must be taken to prevent tailwater from infested fields from entering irrigation water supplies.Total Fusarium and F. o. cepae populations varied between year and location in Fusarium contaminated fields. Propagule numbers were greatest in fields planted to onions than fields planted to pinto beans. Total Fusarium populations was as high as 7900 cfu's gram-1 of native soil.Greenhouse trials of metalaxyl, imazalil, fosetyl-aluminum/iprodione, and thiophanate methyl, resulted in significantly fewer living plants than untreated checks. This may have been due to phytotoxic effects of these materials when applied to steam-sterilized soil.Seedling emergence was significantly greater with metam-sodium treatments than other treatments evaluated. There was no significant difference between band-applied rates of 280.7 and 327.4 liters hectare-1. Post-emergence treatments of thiophanate-methyl, metalaxyl, and fosetyl-aluminum/iprodione are ineffective in reducing Fusarium basal rot or increasing yield.Metam-sodium, band-applied at 223.8 and 280.7 liters hectare-1 , and broadcast-applied at 701 liters hectare-1 , resulted in significant increased yields of marketable onions. Metalaxyl consistently resulted in reduced marketable yields due to reduced emergence and seedling survival.
机译：鳞茎洋葱（葱属洋葱）已经使用了5000多年，是一种重要的粮食作物。尖孢镰刀菌Schlecht。 F。 sp。 cepae（Hanzawa）Snyder＆Hansen（F. o。cepae）是洋葱鳞茎镰刀菌基腐病的致病因子，在世界上种植洋葱的大多数地区都存在，是该作物的主要病害。这种病原体导致高达90％的幼苗损失和30％的鳞茎损失。本论文报道了尖镰刀菌（Fusarium oxysporum f）的生物学，流行病学和防治研究。 sp。科罗拉多州的镰刀菌。三个营养相容的镰孢镰刀菌f。 sp。在科罗拉多州发现了cepae。一类VCG在科罗拉多州分布广泛，一类仅限于三角洲县，而第三类在梅萨县。鉴定出的另外两种VCG是单一分离的VCG。每毫升灌溉水中存在多达130 cfu的镰刀菌。镰刀菌污染的灌溉水可以侵染以前没有F. o。 cepae。必须注意防止感染区域的尾水进入灌溉水源。在镰刀菌污染地区，每年和不同地点的洋葱头孢菌种群都不同。在种植洋葱的田地中，繁殖数量比在斑豆种植的田地中繁殖数量最多。镰刀菌种群总数高达7900 cfu's gram-1的原生土壤。甲霜灵，咪唑，羟色胺铝/异丙隆和甲基托布津的温室试验所产生的活植物比未经处理的检查少得多。这可能是由于这些材料应用于蒸汽灭菌的土壤后具有的植物毒性作用。与其他评估方法相比，采用间位钠处理的幼苗出苗率明显更高。施肥量分别为280.7和327.4升公顷-1之间没有显着差异。芽孢后甲基，甲霜灵和呋塞基铝/异丙嗪的发芽后处理对减少镰刀菌基腐病或增加产量无效.Metam-钠，分别在223.8和280.7升公顷-1上播种，并于701播种升公顷-1导致可出售洋葱的产量显着增加。甲霜灵由于出苗率和幼苗存活率的降低，始终导致可销售的产量下降。

著录项

  • 作者

    Swift, Curtis Elmer.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Agriculture Plant Pathology.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 288 p.
  • 总页数 288
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号