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首页> 外文期刊>Plant Pathology >Dynamics of soilborne Rhizoctonia solani in the presence of Trichoderma harzianum:effects on stem canker,black scurf and progeny tubers of potato
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Dynamics of soilborne Rhizoctonia solani in the presence of Trichoderma harzianum:effects on stem canker,black scurf and progeny tubers of potato

机译：哈茨木霉菌存在下土壤传质的茄根枯菌的动力学：对马铃薯茎秆溃疡病，黑糠和后代块茎的影响

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摘要

Stem canker and black scurf are diseases of potato caused by the fungus Rhizoctonia solani.Spatiotemporal experimentation and empirical modelling were applied for the first time to investigate the effect of antagonistic Trichoderma harzianum on the dynamics of soilborne R.solani on individual potato plants.Trichoderma harzianum reduced the severity of symptoms,expressed as 'rhizoctonia stem lesion index' (RSI),during the first 7 days post-inoculation when the inoculum of R.solani was placed at certain distances (30-60 mm) from the host.For example,with inoculum at 40 mm from the host,RSI was 6 and 40 with and without T.harzianum,respectively.At later observation times,the antagonistic effect was overcome.Trichoderma harzianum reduced the severity of black scurf on progeny tubers.Furthermore,the mean number of progeny tubers per potato plant was reduced by the biocontrol treatment (means of 6.5 + 1.1 and 9.9 + 2.7 tubers per plant with and without T.harzianum,respectively),as was the proportion of small (0.1-20.0 g) tubers (48% and 66% with and without T.harzianum,respectively).Additionally,there were fewer malformed and green-coloured tubers in pots treated with T.harzianum than in those without T.harzianum.
机译：茎枯萎病和黑糠病是由马铃薯根瘤菌引起的马铃薯病害。在接种R.solani接种物距宿主一定距离（30-60 mm）后的接种后前7天，降低了症状的严重程度，表现为``rhizoctonia干病灶指数''（RSI）。在距宿主40毫米处接种，RSI分别为有和没有哈茨木霉的RSI分别为6和40。在随后的观察时间，哈茨木霉减少了黑皮病对子代块茎的严重程度。通过生物防治处理，每株马铃薯的平均子代块茎数量减少了（分别在有和没有哈茨木霉的情况下，每株分别为6.5 + 1.1和9.9 + 2.7块茎），小块茎（0.1-20.0 g）的块茎（分别在有和没有哈茨木霉的情况下分别为48％和66％）。此外，用哈茨木霉菌处理的盆中畸形和绿色块茎比没有T.哈尔扎努姆。

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