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为了解浙北山地丘陵小麦田杂草的发生种类和群落结构,实现麦田杂草的可持续治理,在浙北山地的典型麦区仙居县开展杂草调查,进行群落多样性和聚类分析。结果表明,仙居县小麦田杂草共34种,隶属于16科,相对优势度大于10%的杂草依次为看麦娘、牛繁缕、碎米荠。对53块样田的多样性进行研究,Simpson指数平均值为0.70,Shannon-Wiener指数平均值为1.53,Pielou指数平均值为0.74,Margalef指数平均值为1.08。聚类分析结果表明,杂草群落可分为4个类群。类群1优势种为看麦娘、臭独行菜、猪殃殃。类群2优势种为牛繁缕、野老鹳草、臭独行菜、婆婆纳。类群3和类群4的优势种均为看麦娘、牛繁缕、碎米荠,但3种杂草在这2个类群里的相对优势度存在差异。综上所述,仙居恶性杂草为看麦娘、牛繁缕,区域恶性杂草为碎米荠,宜选择氟噻草胺、甲基二磺隆、噻吩磺隆3种除草剂搭配除草。 相似文献
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根据仙居县创建全国绿色食品原料(水稻)标准化生产基地2年来的经验,分析了基地质量安全监管方面的措施,以及基地技术标准,指出基地建设质量安全存在的问题,并提出了改进措施。 相似文献
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浙江甘薯蔓枯病病原菌鉴定 总被引:1,自引:0,他引:1
Recent years, gummy stem blight caused by Diaporthe spp. is an important disease on Ipomoea batatas. In this study, infected plant tissues, collected from Ningxi, Taizhou, were used for isolating pathogens from the gummy stem. Three pure strains with similar cultural characteristics were isolated, tested for their pathogenicity against stems of I. batatas, and re-isolated from the tissue inoculated, and Koch's postulate was fulfilled. The rRNA intergenic spacer (ITS) region of these isolates was amplified and the sequences were used for the phylogenetic analysis. The aliment result showed that the sequences (MT107556, MT107557 and MT107558) of three strains were 100% similarity with that of D. batatas CBS 122.21. These isolates were identified as D. batatas based on the morphological and molecular characteristics. Therefore, gummy stem blight on Ipomoea batatas was caused by D. batatas in Zhejiang province. Meanwhile, this study firstly showed that the stroma of D. batatas was coralloid. 相似文献
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不同用药方法对单季晚稻主要病虫控制效果及经济效益分析 总被引:1,自引:0,他引:1
为有效控制单季晚稻病虫害,尤其是控制褐飞虱危害,减少用药次数,降低防控成本,提高病虫害的组合防控水平,为今后有效防控积累成功经验。我们通过两种用药方案对控制单季晚稻主要病虫效果及经济效益进行对比试验。试验结果表明,先正达方案对控制水稻三虫具有很好的防治效果,尤其对褐飞虱防控成效显著,收割前先正达用药方案区二化螟残留量为0条,白穗率为0,卷叶苞率0.14%,褐飞虱百丛仅为70头,而农民自主用药方案区分别为1 868头,0.33%,0.41%,1 350头,对照区分别为4 802头,2.5%,4.52%,13 050头。同时,在增产及降低农药使用量上效果明显。 相似文献
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