| 西双版纳香荚兰根腐病发病规律研究 |
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| 引用本文： | 杨雄飞,何美云,李加智,陈艳.西双版纳香荚兰根腐病发病规律研究[J].热带农业科技,1999(2). |
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| 作者姓名： | 杨雄飞 何美云 李加智 陈艳 |
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| 作者单位： | 云南省热带作物科学研究所 |
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| 摘 要： | 通过系统观察，香荚兰根腐病周年发生，随种植时间延长而病情累积增高。新增病根发病率增高在高温季节，而在低温干旱季节降低。根腐病发病率＜５０％的调查样方有１９．７％的表现出蔓叶发黄；发病率＞６０％的，则有９０％以上的蔓叶发黄，可以把发病率＜４０％作为该病的控制指标。田间管理好，根系发达，生长良好的园地，病情较轻。离体幼根接种试验表明，根尖和根毛区是病原主要的入侵部位。有１５％的幼根不感病，大多数感病根，病斑扩展到一定程度即停止活动，仅有１２％的根病斑发展到全根死亡。病斑扩展期为２～７ｄ，扩展速度为０．２～８．４ｍｍ／ｄ。
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| 关 键 词： | 香荚兰 根腐病 发生规律 西双版纳 |
Study on Incidence Rule of Vanilla Root Rot in Xishuangbanna |
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| YANG Xiong-fei,HE Mei-yun,LI Jia-zhi,CHEN Yan.Study on Incidence Rule of Vanilla Root Rot in Xishuangbanna[J].Tropical Agricultural Science & Technology,1999(2). |
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| Authors: | YANG Xiong-fei HE Mei-yun LI Jia-zhi CHEN Yan |
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| Abstract: | It was discovered that vanilla root rot occurs through a year and the severity increases as planting time goes onIncidence rate of the disease is higher during hot season than cold-dry seasonWhen the rate is lower 50%,vines and leaves become yellow in 197% of sample piots,but when the rate is over 60%,vines and leaves become yellow in upwards 90% of sample piotsSo that rate of 40% will be qua controll targetsRoot tip and root hair plot are infective main parts15% of young root are not susceptableLesions stop spreading after the lesion spread at certain degreeOn most of infected roots,only 12% of the roots will develope to deadThe spreading phase is 271d,spreading speed is 02mm84mm/d |
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| Keywords: | vanilla root rot Fusarium spp incidence rule Xishuangbanna |
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