寄主

Isolates from watermelon-growing areas were classified into 3 races like race 0, race 1 and race 2 which were 8 (17.4), 30 (65.2), and 8 (17.4%), respectively. Pathogenecity of race 0 isolates are weakest which only make Sugar Baby susceptible; isolates of race 1 are intermediately pathogenetic, they make Sugar Baby and Charleston susceptible Gray but Calhoun Gray resistant; isolates belonging to race 2 possess the strongest pathogenecity, which make 3 hosts susceptible. Isolates of race 0 mainly distribute over the central and southern Hebei province, whereas race 2 cover the middle and north of Hebei, isolates of race 1 exist in the whole watermelon-growing areas in Hebei province.

根据鉴别寄主对供试菌系的抗感反应，将46个西瓜枯萎病菌系划分为0号、1号和2号3个不同的生理小种，分别包括8，30和8个菌系，占供试菌系的17.4%、65.2%和17.4%；0号生理小种菌系致病性最弱，仅使品种Sugar Baby感病，以冀中和冀南居多；1号生理小种菌系致病力中等，使鉴别寄主Sugar Baby和Charleston Gray感病，而使Calhoun Gray抗病，分布在整个河北省西瓜种植区；2号生理小种的菌系致病力最强，使3个鉴别寄主均能感病，主要分布在冀中和冀北。

A series of interactions such as nematode pathogenicity, host susceptibility and host resistance could form due to parasitism.

寄生过程引起的根结线虫与寄主植物之间的一系列互作反应，包括根结线虫对寄主植物的致病现象，寄主植物的感病反应和抗病反应。

Moreover, the resistance level of the RSC strain was higher than that of the SRC strain, demonstrating that selection with more resistant hosts can accelerate the development of resistance in the parasitoid. Ratios of MFO activity in the SP, SRP and RP strains of P.

以SRP为寄主的RSC品系的抗性水平高于以SP为寄主的SRC品系的抗性水平，表明和抗性较高的寄主同步筛选，寄生蜂的抗性发展更快。

A model system for the relationship between parasitoid and its host was established by microoperation to study the effects of polydnavirus and venom from female parasitoid, teratocytes from parasitoid larva and the larva itself on the growth of the host.

通过显微手术建立一套研究寄生蜂和寄主关系的实验模型，以寄主体重为指标，用该模型研究了来自寄生蜂的活性物质多态DNA病毒(PDV，蜂毒，畸形细胞和幼蜂本身对寄主生长发育的影响。

The stem was cut into several segments away from the pine seeding, arranged and collected in the order of chronology time and distance from where they were inoculated. To separate B.xylophilus coarsely out from the stems and made them into paraffin slices. And be observed under the potics microscope by dyed with safranin-fast green contrast-stain method and PI fluorescence stain method. In order to find out how about the nematode rigour distributing , but also ebb and flow of their amounts after invading the host pine seeding. Seek the pathological changing orderliness of host cells in different position along with the remotion of nematodes. By deeply analysing the variety of host cell nucleolus to estimate whether the host cell took place the programmed cell death after inoculated B.xylophilus.

按时间进程和与接种点上下距离的远近，对松苗分茎段进行粗分离和制作成石蜡切片，分别用番红-固绿双重染色法和碘化丙锭荧光染色法在光学显微镜下观察，以了解线虫侵染后在寄主体内的准确分布和数量的消长，寻找随着线虫的移动扩散，寄主不同部位细胞病变的数量、速度发生的变化规律，并进一步通过分析其细胞核的变化来判定松材线虫侵染后是否能诱发寄主细胞发生程序性死亡(programmed cell death，PCD)。

The main results are as follows: l.The olfactory response of Tetranychus viennensis to different plants odors: Olfaction takes part in the response during the hawthorn spider mite looking for host plants, that means Tetranychus viennensis were attracted by odors from host plants.

结果如下：1。山楂叶螨的雌成螨对不同植物叶片挥发性物质的嗅觉反应：山楂叶螨在寻找寄主植物的过程中，嗅觉参与反应，即山楂叶螨能被寄主植物释放的气味物质所吸引；不同的寄主植物对山楂叶螨的引诱程度不同，苹果、梨等的引诱作用较强(着螨率95％，77.5％)，日本樱花的引诱作用较弱(着螨率45％)。

Mainly belonged to Loranthaceae. Plants of Phacellaria Benth. and their hosts were mainly distributed in tropical and subtropical area. Plants of Phacellaria Benth. maybe originated in tropical area in the south of China before Tertiary. Their ancestors were parasitic on ancestors of some plants of Loranthaceae by chance during Tertiary. It took them millions of years to form a sturdy relationship between parasites and hosts. Ph. rigidula was a hemi-parasitic subshrub. In area observed, its host was mainly Taxillus caloreas var. fargesii.

的硬序重寄生(Ph.rigidula)及其寄主植物做为研究植物与植物间协同进化的材料，对重寄生属植物的起源、与其寄主的分布、硬序重寄生的形态学特性、解剖学以及化学成分进行了研究，结果表明：重寄生属植物主要寄生在桑寄生科植物上，分布区与其寄主的基本一致，均主要分布在东南亚和中国南部的热带与亚热带地区；重寄生属植物可能起源于第三纪之前某一时期的华南热带地区，随后向周边地区扩散。

ABSTRACT Anoplophora glabripennis is an invasive wood-boring cerambycid beetle that kills hardwood trees. The host range of this species is unusually broad but is not well de?ned in the available literature and may include tree species that have not been reported as hosts because they have not previously been exposed to the beetle.

光肩星天牛是一种能够导致硬树死亡的入侵钻蛀性天牛，它的寄主范围异常广泛，但在现有的文献资料中还没有被明确的界定，寄主可能包括一些以前因为没有机会接触到甲虫的树种，故没有被作为寄主而报道。

A set of maize inbreds or cultivars were firstly screened as GLS(Cercospora zeae-maydis)pathogen differential hosts with genetic background which current cultivars shared in China,such as inbreds Shen137,78599-1,Mo17,748,C8605-2,E28,598,Va35,K12 were identified as major ones,and cultivars Shenshi29, Shenshi31,Tiedan9,Yedan13,Dan413,Danyu18,Shennong87,Dongdan54 as affiliated ones.

从我国玉米品种资源中首次成功筛选出9个具有广泛血缘代表性的自交系，即沈137，78599-1，Mo17，478，C8605-2，E28，598，Va35，K12，作为玉米灰斑病菌的生理分化鉴别寄主；8个主栽品种，即沈试29，沈试31，铁单9，掖单13，丹413，丹玉18，沈农87，东单54，作为辅助鉴别寄主，从而确定了玉米灰斑病菌生理分化鉴别寄主体系。

The phytotoxin can restrain the activities of peroxidase , polyphenol oxidase and phenylalanine ammonia lyase that existed in the tree, and so reduce the resistance of the host tree and benefit the fungus to intrude into the tree successfully.

该毒素能抑制寄主组织中过氧化物酶、多酚氧化酶和苯丙氨酸解氨酶的活性，降低寄主树木的抗御能力，从而有利于菌突破寄主的生理防御屏障而成功地侵染生长。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。