永州烟草根腐病的发生规律及其影响因素分析

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中图分类号：S572；S435.72 文献标识码：A 文章编号：1006-060X（2025）11-0064-04

Abstract：Toclarifytheoccurrence dynamicsandinfluencingfactorsof tobaccorootrotinYongzhou，adiseasesurvey was conductedinthemain tobacco-producingareasofLanshan County.Theoccurrenceofrotrotinthefeldswithdiferenttobacco cultivars，trasplantigeods，ertiationegiesandropngpatesasiestigatedsultsidicatedthattease hadanearlystwithifectedpntsappeing2dysaftertrasplantingadeteredaigcidencestagfterMayacing an average disease incidence of 27.67% .After that，the condition developed rapidly. The susceptibility to this disease varied among thethreecuivarsSpecificallyunan99'soedlowerseaseicideneandidex，ichidicatedbeterfeldesistancehile Yunyan87'andXiangyan7'weremoresusceptible.Regarding transplanting methods，thenon-mulchedtreatmenthadsignificantly lowerdiseaseincidenceandindexthantheplasticfim-mulchedtreatment.Dierentfertilizationregiesshowednosignfcantefct on root rot in the earlyand middle stages，while the F3 regime （increased basal fertilizer and seedling-raising fertilizer，nomanure application，educedtopdresingfrequency）esultedinlowerdiseasesverityattelategrowthstage.Intsofropingpats， at the late investigation stage， the disease incidences in R2 （tobacco-fallow-late rice-tobacco） and R3 （tobacco-fallow-tobacco） patterns were significantly lower than that in the R1 （tobacco-late rice-tobacco-tobacco） patern. Inconclusion，it is recommended that cultivars such as'Yunyan 99'withgoodfieldresistance should be prioritized，andintegrated measuressuchas non-mulchedtransplanting， rational fertilization， and rotation and fallow should be adopted.

Key words： Yongzhou; tobacco; root rot; occurrence dynamics; influencing factors烟草根腐病是一种典型土传病害，常与黑胫病、青枯病复合发生，具有潜伏侵染、发病迅速、防治困难和危害严重等特点[1-3]。（剩余5591字）