共查询到14条相似文献,搜索用时 46 毫秒
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乌蔹莓[Cayratia japonica(Thunb.)Gagnep.]又名五爪龙,葡萄科乌蔹莓属多年生草质藤本植物。乌蔹莓是果桑茶园普遍发生的恶性杂草,单株生物量大,种子繁殖,蔓延快,如不及时防除,危害极其严重。现将近年来所作田间调查、定点观察及防除试验总结如下。1分布及危害分别在江苏省仪征市青山(代表丘陵山区黄土地段)、胥浦(代表圩区堤坡沙土地段)、夏州(代表圩区平原湿润沙壤土地段)3个镇,取有代表性果桑茶园3块,每块田调查10个样方(每样方1 m2),计算密度(株数/m2)、盖度(垂直投影覆盖率)、频度(样方中出现次数)。调查时间为5月上旬,结果见表1。由… 相似文献
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苹果异形小卷蛾(Thaumatotibia leucotreta)是世界范围内重要的检疫性有害生物,对水果和农作物等生产具有重要影响,并影响国际贸易发展。本研究选用线粒体 COI 基因作为物种鉴定的条形码,结合 GenBank 数据库、BOLD 数据库比对和系统进化树构建,对2014年1月广州白云国际机场口岸入境加纳牛油果中截获的卷蛾科昆虫进行分子鉴定。根据 GenBank 数据库比对分析、NJ方法构建的系统进化树分析以及 BOLD 数据库查询分析,最终鉴定该样品为苹果异形小卷蛾。认为基于 DNA 条形码的分子鉴定能快速、准确地鉴定苹果异形小卷蛾。 相似文献
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槐小卷蛾性信息素次要活性组分的鉴定与活性 总被引:1,自引:0,他引:1
采用单腺体提取技术,通过毛细管气相色谱、气┐质联用分析以及触角电位活性测定和林间试验,鉴定出槐小卷蛾性信息素的次要活性组分反8,反10┐十二碳双烯醛。林间活性试验表明,反8,反10┐十二碳双烯醛单独使用时没有诱蛾活性;但在槐小卷蛾性信息素的主要活性成分中加入反8,反10┐十二碳双烯醛,田间诱蛾量显著提高 相似文献
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MINORU ICHIHARA HIDEHIRO INAGAKI KAZUO MATSUNO CHIEKO SAIKI MASAYUKI YAMASHITA HITOSHI SAWADA 《Weed Biology and Management》2012,12(3):131-135
The potential impact of postdispersal seed predation by the field cricket, Teleogryllus emma (Ohmachi et Matsuura), on the seedling emergence of Italian ryegrass (Lolium multiflorum Lam.), a non‐native grass weed in Japan, was determined. The relationship between cricket density and the proportion of seedling emergence was investigated by conducting manipulative experiments in duplicate, using enclosures. One‐thousand seeds of Italian ryegrass were exposed to adult crickets at different densities (zero, one, two, four and eight individuals per 2.25 m2 enclosure) for 2 weeks. The proportion of seedling emergence decreased with increasing cricket density. The proportion of seedling emergence in the enclosures without the crickets was 90.9–97.2%, whereas the seedling emergence in the enclosures with eight crickets greatly decreased, to 0.5–2.5%. These results suggest that postdispersal seed predation by T. emma can substantially decrease the abundance of Italian ryegrass at an early life stage and reduce its population in environments with a high density of crickets. 相似文献
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Ruth R. do Nascimento Ivanildo S. de Lima Cludia M. L. de Mendona Luciano C. N. da Silva Adriana G. Duarte Antnio E. G. Sant'Ana 《Pest management science》1998,54(3):311-313
The Annona seed borer, Bephratelloides pomorum (Hymenoptera: Eurytomidae), is the most important insect pest of soursop, Annona muricata L. The female lays eggs directly into the most recently formed seeds of developing fruit where the larvae remain feeding until pupation. When fully developed, the young wasps make a channel to emerge from the fruit, ready to copulate. Males are attracted to females and display a peculiar behaviour which consists of three steps: antennation, lateral bouncing and wing vibrations. Experiments carried out in semi-field and laboratory conditions showed that males also behave similarly in the presence of filter paper impregnated with a hexane extract of the female's body, suggesting that female B. pomorum produce an attractant which enables males to find them. The hexane extracts of females, analysed by GC-MS, were shown to consist mainly of a mixture of straight- and branched-chain hydrocarbons and esters. © 1998 Society of Chemical Industry 相似文献
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茶尺蠖Ectropis obliqua (Prout)及其近缘种灰茶尺蠖E. grisescens Warren是我国茶树上最为重要的两种食叶性害虫,茶尺蠖绒茧蜂Apanteles sp.和单白绵绒茧蜂Apanteles sp.是茶尺蠖Ectropis spp.幼虫期最重要的两种寄生性天敌昆虫。为了明确这两种绒茧蜂的物种名称及形态差别,同时探明这两种绒茧蜂是否是茶尺蠖和灰茶尺蠖的共有寄生蜂,本研究采集了我国8省22个地方的茶尺蠖或灰茶尺蠖幼虫,通过室内饲养获得两种绒茧蜂的标本,对标本进行形态鉴定;同时将两种绒茧蜂的COI基因序列与Bold数据库中已知物种进行比对。结果表明,从野生茶尺蠖和灰茶尺蠖幼虫中均饲养出之前报道的茶尺蠖绒茧蜂Apanteles sp.和单白绵绒茧蜂Apanteles sp.两种寄生蜂;形态鉴定和分子比对结果表明,这两种广义绒茧蜂Apantelesspp.实为尺蠖原绒茧蜂Protapantelesimmunis(Haliday,1834)和单白绵副绒茧蜂Parapanteles hyposidrae (Wilkinson, 1928)。本研究明确了40多年前国内报道... 相似文献
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在室内温度(25±2)℃,光周期L∥D=12h∥12h,相对湿度(75±10)%条件下,对蒲螨的寄生行为、其对寄主龄期的选择性、膨腹体的发育过程以及世代生活史进行观察。结果表明:在室内蒲螨能很好地找寻寄主并寄生。平均每头雌螨一生产雌43.31头,产雄4.82头,产子期14.06d,寿命为21.21d。蒲螨对椰心叶甲各龄期的选择性达极显著差异,最喜欢寄生蛹,选择寄生率达到96.67%;其次是5龄幼虫,寄生率为60.00%;1龄幼虫的寄生率最低,只有10.00%。 相似文献
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伞滑刃线虫属分种检索 总被引:8,自引:0,他引:8
依据2004年以前发表的所有伞滑刃属新种原始报道的资料,分析了伞滑刃属73个相关种的所有形态学分类特征,编制了64个伞滑刃属有效种的分类检索表. 相似文献