本文首次报道马铃薯茎基腐病在田间表现为立枯型、萎蔫型、根腐型、黄化型4种症状类型,一般在苗期至现蕾期、开花期至结薯期为发病高峰期;明确了河西灌区种植的大多数品种对茎基腐病无明显抗性;发病程度与多种因素有关,灰钙土发病较重,其次为壤土,沙土发病较轻;土壤pH与含水量较高发病重;植株密度较高发病重;连作年限越长发病越重;与油菜、茄科蔬菜连作发病较重;高温有利于该病发生;经药剂种薯、土壤、灌根处理表明:以代森锰锌、菌核净和敌磺钠种薯和土壤处理,代森锰锌、井·1亿活枯草芽孢菌、菌核净灌根处理,防效达50.3%～65.9%.%The symptoms of potato crown rot were recorded for the first time, i.e.damping-off, wilt, root rot and yellowing.The disease severely occurred during seedling, budding, flowering and fruiting stages.No significant resistance to crown rot had been observed in most cultivars.The effect of soil texture on potato crown rot was that the disease index was highest in sierozem, lower in clay loam and lowest in sandy soils.The disease occurrence was more serious in alkaline soils with high water content than in weak acid or neutral soils with low water content.High density caused serious disease.The longer the consecutive cropping lasted, the more seriously the disease occurred.Rape-potato and solanaceae-potato cropping also caused more serious disease.High temperature and moisture were good for potato crown rot occurrence.Control tests indicated that the efficacy of mancozeb,dimetachlone and fenaminosulf with seed treatment and soil treatment, and mancozeb, dimetachlone and brevibacterium with root-irrigating treatment were between 50.3％ and 65.9％.
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