...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plant Pathology >Effect of defoliation by livestock on stem canker caused by Leptosphaeria maculans in Brassica napus
【24h】

Effect of defoliation by livestock on stem canker caused by Leptosphaeria maculans in Brassica napus

机译：牲畜脱叶对甘蓝型油菜引起的黄褐线虫引起的茎萎缩的影响

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

Brassica napus (canola, oilseed rape), an important break crop for cereals across the Australian wheat belt, is being rapidly adopted as a dual-purpose (forage and grain) crop in mixed farming systems. Stem canker caused by the fungus Leptosphaeria maculans is the most important disease of B. napus in Australia. The primary source of inoculum is airborne ascospores released during autumn/winter which coincides with the grazing of dual-purpose crops. Field experiments were defoliated by sheep to determine the effect of grazing on blackleg stem canker severity at plant maturity in B. napus cultivars differing in their resistance level and grazed at different times. One cultivar was sown on different dates to investigate the impact of grazing at the same time, but at different growth stages. Defoliation by mowing was compared to defoliation by livestock. Similar amounts of dry matter remained after defoliation by machinery (0·66 t ha~(-1) ) or livestock (0·52 t ha~(-1)). However, stem canker severity was higher in the grazed (40% of crown cross-section diseased) compared with the mown (25%) treatment, which was higher than the ungrazed control (9%). Stem canker severity generally increased with grazing, but the increase was eliminated or reduced in cultivars with good resistance. Grazing during vegetative plant growth minimized the increase in stem canker severity compared with grazing during reproductive growth. Currently, cultivars with good L. maculans resistance are recommended in high disease situations. To avoid excessive yield loss in dual-purpose B. napus crops due to L. maculans it is recommended that such cultivars are grown even in low-moderate disease situations.
机译：甘蓝型油菜（低芥酸菜子，油菜）是澳大利亚小麦带上谷物的重要减产作物，在混合耕作系统中正迅速被用作两用（饲料和谷物）作物。由真菌Leptosphaeria maculans引起的茎溃疡是澳大利亚双歧杆菌最重要的疾病。接种物的主要来源是秋冬释放的气生子孢子孢子，这与两用作物的放牧相吻合。绵羊对野外实验进行脱叶试验，以测定放牧对不同抗性和不同放牧时间的甘蓝型油菜（B. napus）品种在植物成熟时黑腿茎枯病严重程度的影响。在不同的日期播种一个品种，以调查放牧的影响，但同时处于不同的生长阶段。将割草造成的落叶与家畜造成的落叶进行了比较。在通过机械（0·66 t ha〜（-1））或家畜（0·52 t ha〜（-1））脱叶后，剩余的干物质含量相似。然而，与割草（25％）相比，放牧（患病的冠状横截面占患病率的40％）的茎can病严重程度更高，后者高于未浸染的对照（9％）。茎can病的严重程度通常随放牧而增加，但对具有良好抗性的品种，其消除或降低了。与生殖生长期间放牧相比，营养植物生长期间放牧将茎stem病严重程度的增加最小化。当前，在高病害情况下，推荐具有良好的黄斑狼疮抗性的品种。为避免在两用型油菜（B. napus）作物中因黄斑狼疮（L. maculans）而导致过多的产量损失，建议即使在中度疾病的情况下也要种植此类品种。

著录项

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