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首页> 外文期刊>Plant Pathology Journal >Crop Residue Affects Rhizoctonia solani Population Dynamics and Seedling Blight of Canola
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Crop Residue Affects Rhizoctonia solani Population Dynamics and Seedling Blight of Canola

机译：作物残茬影响油菜枯萎病菌种群动态和幼苗枯萎病

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摘要

Seedling blight caused by Rhizoctonia solani Kiihn substantially reduces stand establishment and seed yield of canola {Brassica napus L）in western Canada. The effect of crop residue on soil populations of R. solani and canola seedling blight was examined under field, greenhouse and laboratory conditions. Field plots were established with inoculation or noninoculation withi?. solani as the main plot and barley, canola, oat and field pea residues as the sub-plots. Soil samples were collected from eachsubplot for analysis in a greenhouse bioassay and laboratory assay of R. solani population before seeding canola. The crop residue effect was not significant. Under inoculation with/?, solani, the yield was consistently greater when canola was grown onbarley residue compared to the canola residue over two-year trials, although oat and pea residue contributed to greater yield. Without inoculation, canola yield was greatest when grown on barley residue, intermediate on oat and pea and the least on canola in the first trial and in the second trial greater yield was obtained on barley and oat residues compared to other residues. In the greenhouse bioassay, canola seedling emergence was greater, while damping off and root rot were less severe, following barley or oat compared to canola or field pea in both inoculated and non-inoculated treatments. Populations of Rhizoctonia were lower following barley or oat relative to canola or field pea. Crop rotation and incorporation of barley or oat residue betweencanola crops may be a useful strategy to reduce seedling blight of canola.
机译：在加拿大西部，茄根枯萎病引起的幼苗枯萎病大大降低了油菜（Brassica napus L）的林分建立和种子产量。在田间，温室和实验室条件下，研究了农作物残留物对茄根枯萎病和油菜幼苗枯萎病的影响。用接种或不接种建立田地。以solani为主要地块，以大麦，低芥酸菜子，燕麦和豌豆残渣为次样。在播种低芥酸菜子之前，从每个子区收集土壤样品，用于温室生物测定和茄红菌种群的实验室测定进行分析。作物残渣效应不显着。在两年的试验中，在接种大麦渣的双低油菜籽中，使用茄尼进行接种，尽管燕麦和豌豆的残留量提高了产量，但其产量始终较高。如果不接种，则在第一个试验中，在大麦残渣上生长时，双低油菜籽产量最高，在燕麦和豌豆上为中间产物，而在双低油菜籽上则最低，在第二次试验中，与其他残留物相比，在大麦和燕麦残基上可获得更高的产量。在温室生物测定中，与低芥酸菜子或大豌豆相比，在接种和未接种的处理下，大麦或燕麦后，双低油菜籽幼苗的出苗率更高，而阻尼和根腐病的严重性则较小。大麦或燕麦后，相对于低芥酸菜子或豌豆，根瘤菌的种群数量减少。轮作和在双低油菜籽作物之间掺入大麦或燕麦残留物可能是减少双低油菜籽苗枯萎病的有用策略。

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