共查询到19条相似文献，搜索用时 156 毫秒
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长白山桦树上一种新腐朽病害 总被引：6，自引：0，他引：6
本文报道了我国长白山林区桦树上一种新腐朽病害,其病原菌为斜生纤孔菌Ｉｎｏｎｏｔｕｓｏｂｌｉｑｕｕｓ。该病主要发生在海拔较高的成熟桦树上,主要特征是在树干上形成黑色肿瘤,造成心材白色腐朽,受害树极易风析,后期全株死亡,对病原菌的宏观,显微结构及病害的症状进行了详细描述,并与欧洲的标本进行了比较。 相似文献
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从1975至2006年的有关科技资料中,汇总到中国1竹亚科10属148竹种(分类单位)上的病原物208种,其中真菌183种、细菌1种、难培养原核生物2种、病毒1种、线虫3种、螨类18种.分别列出了病害名称、竹种、病原物和分布省份.根据最新分类系统确定了各类病原物(分别真菌、细菌、病毒、线虫、螨类)的分类地位,它们隶属于5纲、22目、2总科、47科、112属.这对了解竹林生态系统组成、生物多样性、防控外来有害生物以及竹病检疫和防治都有重要的参考作用. 相似文献
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从1975至2006年的有关科技资料中,汇总到中国1竹亚科10属148竹种上的病原物208种,其中真菌183种、细菌1种、难培养原核生物2种、病毒1种、线虫3种、螨类18种.分别列出了病害名称、竹种、病原物和分布省份.根据最新分类系统确定了各类病原物(分别真菌、细菌、病毒、线虫、螨类)的分类地位,它们隶属于5纲、22目、2总科、47科、112属.这对了解竹林生态系统组成、生物多样性、防控外来有害生物以及竹病检疫和防治都有重要的参考作用. 相似文献
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从黑龙江省西瓜主产区分离露地西瓜果斑病病原菌18份,经过致病性测定,其中有8份对西瓜具有致病性。通过培养性状观察、显微形态观察、染色及生理生化测定,证明这8个菌株为燕麦食酸菌西瓜亚种。这8个菌株的寄主范围不尽相同。 相似文献
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Bacteriostatic effect of flavonoids isolated from leaves of Psidium guajava on fish pathogens 总被引：1，自引：0，他引：1
The antimicrobial activity against fish bacterial pathogens of flavonoids (morin, morin-3-O-lyxoside, morin-3-O-arabinoside, quercetin, and quercetin-3-O-arabinoside) isolated from the leaves of Psidium guajava was evaluated. The flavonoids were shown to have bacteriostatic effect on all of the tested bacteria. 相似文献
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【目的】探讨中国油茶苗圃炭疽病原菌种类,揭示油茶苗圃炭疽病菌抗药性,为其防治提供依据和指导。【方法】分离油茶苗圃炭疽病菌,并对分离菌株的ApMat基因进行PCR扩增和测序,通过对序列系统发育分析鉴定炭疽病原菌种类;采用区分剂量法测定所有菌株对杀菌剂多菌灵、乙霉威、戊唑醇和咪鲜胺的抗药性。【结果】湖南、江西、海南和广东4个省份分离的95株的油茶苗圃炭疽病病原菌主要是果生炭疽菌(Colletotrichum fructicola)、暹罗炭疽菌(C.siamense)、山茶炭疽菌(C.camelliae)和胶胞炭疽菌(C.gloeosporioides)4个种,其中炭疽病菌分布范围最广、分离数量最多(83株,占总分离菌株的87.4%)。抗药性测定结果表明,对多菌灵产生抗性的菌株有31个,占总分离菌株的32.6%;对戊唑醇产生了抗性的菌株有31株,占总分离菌株的32.6%。其中对多菌灵和戊唑醇这2种杀菌剂均具有抗性的菌株有6株,占总分离菌株的6.3%;对多菌灵、乙霉威和戊唑醇3种杀菌剂均有抗性的菌株有2株,占所有分离菌株的2.1%。但所有95个菌株对咪鲜胺敏感,说明目前苗圃油茶炭疽病菌尚未对咪鲜胺产生抗药性。29个高抗多菌灵而对乙霉威敏感菌株第198位氨基酸由谷氨酸(Glu)突变为丙氨酸(Ala),2株对多菌灵和乙霉威具有双重抗药性的菌株第200位氨基酸由苯丙氨酸(Phe)突变为酪氨酸(Tyr)。【结论】我国油茶苗圃炭疽病菌已对多菌灵/乙霉威和戊唑醇产生严重的抗药性,但对咪鲜胺尚未检测到抗药性。 相似文献
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《Forest Ecology and Management》2002,169(3):231-242
To better understand pathogen/herbivore interactions and landslide regeneration, percent leaf area lost to disease and herbivory on two Puerto Rican trees over a 1-year period was sampled. Cecropia schreberiana saplings lost from 1 to 3% leaf area to pathogens and from 1 to 7% to herbivores. For Inga vera, both sapling and seedling losses to pathogens were minimal, but Inga herbivory losses reached 25% for saplings and 34% for seedlings. The most common fungi on Cecropia leaves were species in the genera Phoma and Phyllosticta, and on Inga leaves was Colletotrichum gloeosporioides. Percent survivorship after 1 year in the field varied among species and life-form (46% for Cecropia saplings, 15% for Inga saplings, 0% for Inga seedlings). There were no effects of pathogens or herbivores on survivorship or growth, but increased levels of herbivory did significantly correlate with total phenolics and condensed tannins in both Inga seedlings and saplings. For both seedlings and saplings of two trees on the neotropic island of Puerto Rico: (1) leaf herbivory was modest and leaf losses to pathogen disease were small; (2) these mechanisms did not affect survivorship or growth; (3) a neotropical tree (I. vera) displayed increased levels of secondary chemicals in its leaves, correlated with increased levels of insect herbivory. 相似文献