However, almost all clones from the primary host were green. 3 : fundatrigeniae (ditto). and Copyright © Cambridge University Press 1974, Hostname: page-component-57c975d4c7-fdlpg Under stationary conditions, the critical photoperiod is close to 14L10D, but shifted to 13.5L10.5D and 15L9D by a preliminary exposure to 10L14D and 18L6D, respectively. Get access to the full version of this content by using one of the access options below. The overall pattern of life-cycle variation can be explained largely on the basis of climatic differences between zones, and the effects of these differences on gene and genotype frequencies within the species. The photoperiod in the egg and early larval stages modifies the critical photoperiod for diapause induction. Reproductive polyphenism, which allows one genotype to produce sexual and asexual morphs, is an extreme case of phenotypic plasticity and is commonly observed in aphids. Tarr, I. J. "relatedCommentaries": false, 1977. Jaouannet, MaÃ«lle Get access to the full version of this content by using one of the access options below. This response is based on dark-time measurement, and shows either an hourglass or a circadian-oscillator feature depending on experimental conditions. Margaritopoulos, J.T. Clones of androcyclic character seem to be widespread and, although genetically isolated anholocyclic biotypes undoubtedly exist, androcyclic clones could be the principal source of parthenogenetic overwinterers in all parts of the world where life-cycle differences exist within populations. 2003. The dominance of resistant poplar genotypes such as 'Robusta' or 'Beaupré' may have preserved plantations from outbreaks before 1996 in southern France and until 2000 in the central part. Weber, C. P. PATERSON, A. J. C. Reyes, M. The importance of phenotypic and genotypic plasticity in the life cycle is discussed. Unexpectedly, one of these genetic programs concerns cuticle proteins and cuticle structure. During the years 1995–1999 the life cycle category of 2797 clones of Myzus persicae (Sulzer) was examined. A geographical variation was found in the proportion of holocyclic clones from tobacco and other secondary hosts associated with the abundance of the primary host in the sampling regions. Total loading time: 0.697 Margaritopoulos, John T. SORENSON, C. E. Remarkably, the green peach aphid, Myzus persicae , colonises plant species across 40 families and single M. persicae clonal lineages can colonise distantly related plants. "hasAccess": "0", 2006. The relationship of spread to the green peach aphid is particularly linked for the phloem-limited PLRV. A. 10 July 2009. C'est en général un parasite holocyclique hétéroécique, alternant entre des hôtes d'hiver, des arbres du genre Prunus (en général le pêcher ), et des hôtes secondaires d'été, avec une reproduction … "openAccess": "0", Brookes, C. P. Genetic diversity is determinant for pest species' success and vector competence. Our results suggest that differential methylation of sex‐biased genes plays a role in aphid sexual differentiation. Moreover, a regional variation was found in different colour forms feeding on tobacco plants. In most seed production areas, green peach aphid migrations occur in the latter half of the season. Four different overwintering life cycle strategies were found that have also been described for M. persicae and other heteroecious species previously. Published online by Cambridge University Press: Biochem. Wie überwintert die gürne Pfirsichblattlaus? The bacteria Bacillus amyloliquefaciens is recognized as a producer of a variety of bioactive compounds. Fuentes-Contreras, E. and Results also show that there is dispersal with gene flow across England, although there is a reduction between the northern and southern sites with the Southwestern population being the most genetically differentiated. Kanavaki, O. M. Knock-down of cathepsin B genes reduced aphid fitness, but only on the host that induced up-regulation of these genes. The overall pattern of life-cycle variation can be explained largely on the basis of climatic differences between zones, and the effects of these differences on gene and genotype frequencies within the species. We have used a genotyping by sequencing approach to study whether i) there is any underlying population genetic structure at a national and regional scale in this pest that can disperse long distances; ii) the populations evolve as a response to environmental change and selective pressures, and; iii) the populations comprise anholocyclic lineages.