Forecasting Infections of the Leaf Curl Disease on Peaches Caused by Taphrina deformans     

S. Giosuè  G. Spada  V. Rossi  G. Carli  I. Ponti 《European journal of plant pathology / European Foundation for Plant Pathology》2000,106(6):563-571

An Israeli model forecasting leaf curl disease on peaches caused by Taphrina deformans was validated in the Emilia-Romagna region of northern Italy, during a three-year period (1996–1998), in 13 cases (year × location × cultivar). When the peach trees are susceptible to infection, the model uses mathematical functions to calculate the risk of infection on the basis of weather conditions (daily rainfall greater than 10mm, and maximum air temperature greater than 5°C), and it forecasts periods of possible symptom appearance based on the length of incubation. Peach trees became susceptible to infection between the end of January and mid March, when the first leaf buds attained phenological stage C, i.e. appearance of leaf apex. The trees remained susceptible for at least 9 weeks: the last infection occurred in mid-May.Since most of the leaf curl onsets observed in the orchards fell within the range of model forecasts, the model proved to be accurate in signalling both the first seasonal infection and repeated infections during the primary inoculum season. Few errors occurred, caused either by conditions of rainfall and temperature lower than the thresholds fixed in the model, or by discrepancies between forecast and actual length of incubation. Infection occurred also at 3.1–3.5°C, and with 9.6mm rainfall. Thus, thresholds should not be accepted too rigorously, and perhaps temperature should not be considered as a limiting factor for infection under the conditions of the present work. The length of incubation showed high variability: it was 23 days long on average, with a 95% confidence interval ranging from 20 to 27 days, and extreme values of 9 and 33 days.  相似文献   

Molecular characterization of Miraflores peach variety and relatives using SSRs     

M. Bouhadida  A.M. Casas  M.A. Moreno  Y. Gogorcena 《Scientia Horticulturae》2007

Some traditional peach varieties, originated from the region of Aragón (Spain), were analysed by SSRs (simple sequence repeats). The aim of this research was to characterize 19 clones related to Miraflores variety, with unknown pedigrees, to assess their genetic diversity and to elucidate their possible relationships with 10 traditional peach varieties. Twenty SSR primer pairs with high levels of polymorphism, which have been previously developed for peach, were used in this study. A total of 46 alleles were obtained for all the microsatellites studied, ranging from one to six alleles per locus, with a mean value of 2.3 alleles per locus. Fourteen SSRs were polymorphic in the set of varieties studied and permitted to distinguish 16 different genotypes out of the 30 initially studied, although fourteen ‘Miraflores’ clones showed identical gel profiles. The genetic distance matrix was used to construct neighbor joining cluster and to perform principal coordinate analysis which allowed the arrangement of all the genotypes according to their genetic relationships. The genetic relationships among these traditional peach varieties, and in particular among ‘Miraflores’ clones are discussed. The obtained results confirm that microsatellite markers are very useful for these purpose.  相似文献   

乡土观赏竹在重庆北碚城市景区中的应用     

孙婵娟  谭茂国  张卫东  袁媛 《竹子研究汇刊》2008,27(3)

重庆北碚乡土竹类植物共有11属51种,其中35种已在园林中得到应用。该文分析了各竹种的观赏特性及应用前景,对竹子在北碚区城市景区中的应用进行了探讨,为市区丰富园林绿化树种,增添园林景观,为类似城市旅游景区提供一定的参考。  相似文献   

Experimental infections of a ciliate Tetrahymena pyriformis on ornamental fishes     

Aranya Ponpornpisit  Makoto Endo  Hisashi Murata 《Fisheries Science》2000,66(6):1026-1031

SUMMARY: Experimental infection of Tetrahymena pyriformis was conducted on ornamental fishes with skin wounded by acetic acid treatment. Among fishes used in this experimental infection, guppy Poecilia reticulata , pristella Pristella maxillaris , neontetra Paracheirodon innesi and cherry barbs Puntius titteya proved to be sensitive to challenge, while medaka Oryzias latipes , dwarf gourami Colisa lalia , goldfish Carassius auratus , platy Xiphophorus maculatus and angelfish Pterophyllum scalare were resistant. In catfish Corydoras aeneus infection was unsuccessful. Exposure to Tetrahymena at ≥100 cells/mL at 25 to 30°C and at pH of 6.0 to 8.0 resulted in the successful infection of some sensitive fish species. Histological and bacteriological observations suggest that deeply destroyed skin tissues from the acid-treated method are the primary factors in successful infection.  相似文献   

多年生观赏草的生长和繁殖特性研究     

赵天荣  张秋君  蔡建岗  沈岚 《北方园艺》2011,(15):103-106

对引种的13种观赏草的物候期、生长情况、繁殖特性进行了调查研究并结合引种试验和应用调查对其引种安全性进行了评价.结果表明:13种观赏草均能够在宁波气候条件下正常生长,达到较好的景观效果,而且不存在自播和根系扩张的可能,确保了生态安全.为今后观赏草在长三角地区园林景观中的应用提供了依据.  相似文献   

论中国盆景中配件的应用与欣赏     

明军  廖卉荣  汪敏  王树进 《北京林业大学学报》2000,22(1):61-65

该文引用借鉴中国画论和园林的相关理论原理 ,总结归纳了中国盆景的配件技艺 ,论述其应用与欣赏 .提出了盆景配件应用的原则和方法  相似文献   

桃树废弃幼果的利用     

黄漫青  周湘元 《北京农学院学报》1999,14(3):39-42

利用春天桃树疏果时疏下来的小桃为原料，借鉴了南方蜜饯的制作特点，研制开发出３种风味独特的低糖桃脯，并介绍了它们的工艺流程和操作要点，具有良好的开发前景．  相似文献   

海南野生观赏植物资源及其在园林中的应用     

侯则红  余雪标  陈展川 《安徽农业科学》2009,37(10):4448-4450

介绍了海南适宜在园林中应用的野生观赏植物资源,探讨了影响海南野生观赏植物在园林中推广的因素及栽培应用的意义,提出了野生观赏植物在园林中栽培应用的策略。  相似文献   

观赏植物组培与辐射结合育种研究进展   总被引：3，自引：0，他引：3  

张冬雪  王丹  张志伟 《福建林业科技》2007,34(1):137-141,181

综合分析了组培与辐射结合育种方式的优点,对这种复合育种方式在观赏植物上的应用进行了分析归纳。总结出组培与辐射结合育种体系的基本技术路线,指出不同植物、不同材料的辐射效果的差异,并列出一些供育种者参考辐射剂量。最后分析了以后的研究方向。  相似文献   

秦岭山区10种野生植物的园林利用价值   总被引：3，自引：1，他引：3  

范建国 《陕西林业科技》2006,(1):53-55

以园林观赏为目的,结合资料查阅和野外调查,从秦岭山区分布的野生植物中选取了唐棣、紫斑牡丹、陕西荚、流苏、山梅花、山丹花、中华秋海棠、秦岭翠雀花、紫斑风铃和乌头草等10种观赏价值较高的野生植物,介绍了其分布、生态要求和观赏价值,为进一步开展引种驯化和品种选育奠定了基础。  相似文献