甘薯扦插期防治甘薯茎基部腐烂病试验研究

Experimental Study on Prevention and Treatment of Stem Base Rot of Ipomoea batatas During Cutting Period

为了有效预防甘薯茎基部腐烂病,保障甘薯产业可持续健康发展。2022年选用‘浙薯38’和‘广台薯1号’2个品种,从5月12日开始,每隔14 d扦插一期,共8期,开展了不同扦插期防治甘薯茎基部腐烂病试验。结果表明,扦插期越早甘薯茎基部腐烂病发病株数越多,扦插期越迟发病越轻,病株数也越少。经方差分析和显著性测定扦插期与株发病率相关性达极显著水平,两者的关系用对数函数建立数据模型,y=-11.8429lnx+54.8861,相关系数r值=-0.938>R_(0.01)[2,6]=0.834,达极显著水平;鲜薯产量测产结果表明,越迟扦插产量越低,产量差异的F值=11.29569>F_(0.01)[7,14]=4.28,达极显著标准。综合防病与甘薯产量分析,以6月9日前后扦插为宜,既防病又能获得高产,这对防控甘薯茎基部腐烂病有积极的指导意义。

In order to effectively prevent stem base rot and ensure the sustainable and healthy development of Ipomoea batatas industry,two varieties,'Zheshu 38'and'Guangtaishu 1',were selected in 2022.Starting from May 12,the cuttings were carried out every 14 days for a total of 8 stages to carry out the experiment for preventing and controlling the stem base rot of Ipomoea batatas at different cutting stages.The results showed that the earlier the cutting stage,the more the plant number of stem base rot occurred,and the later the cutting stage,the miler the disease was,and the fewer the number of stem base rot.The correlation between the cutting stage and the plant incidence reached a very significant level by variance analysis and significance test.The data model of the relationship between them was established by logarithm function,y=-11.8429lnx+54.8861.Correlation coefficient r=-0.938>R_(0.01)[2,6]=0.834,reaching a very significant level.The results of fresh potato yield measurement showed that,the later the cutting yield,the lower the yield,and the F value of yield difference was 11.29569>F_(0.01)[7,14]=4.28,reaching the extremely significant standard.Combining disease prevention and Ipomoea batatas yield analysis,it was appropriate to take cutting around June 9 to prevent disease and obtain high yield,which had positive guiding significance for the prevention and control of stem base rot.