| dolichodial: a new aphid sex pheromone component? | the sex pheromones of many aphid species from the subfamily aphididae comprise a mixture of the iridoids (cyclopentanoids) (1r,4as,7s,7ar)-nepetalactol and (4as,7s,7ar)-nepetalactone. in this paper, we investigate whether other chemicals, in addition to nepetalactol and nepetalactone, are released from dysaphis plantaginea (rosy apple aphid) oviparae as part of their sex pheromone. four compounds present in an air entrainment sample collected from d. plantaginea oviparae feeding on apple (malus ... | 2008 | 19023626 |
| densovirus induces winged morphs in asexual clones of the rosy apple aphid, dysaphis plantaginea. | winged morphs of aphids are essential for their dispersal and survival. we discovered that the production of the winged morph in asexual clones of the rosy apple aphid, dysaphis plantaginea, is dependent on their infection with a dna virus, dysaphis plantaginea densovirus (dpldnv). virus-free clones of the rosy apple aphid, or clones infected singly with an rna virus, rosy apple aphid virus (raav), did not produce the winged morph in response to crowding and poor plant quality. dpldnv infection ... | 2009 | 19439653 |
| low-drift nozzles vs. standard nozzles for pesticide application in the biological efficacy trials of pesticides in apple pest and disease control. | the coarse spray air-induction nozzles have documented pesticide drift reducing potential and hence pose lower risk of environmental pollution than the standard fine spray hollow cone nozzles. however, it is questioned that use of the low-drift nozzles might not provide as effective crop protection as the standard nozzles. the objective of work was to assess the pest and disease control efficacy as affected by spray volume rate and nozzle type. the experiment was carried out in apple orchard, cv ... | 2017 | 27720255 |
| the use of common elder sambucus nigra to promote aphidophagous syrphids in apple orchards. | elder shrubs (sambucus nigra l.) were planted in an experimental apple orchard as bordering hedgerow with the objective of rearing syrphids (diptera: syrphidae) and consequently enhancing the biological control of the rosy apple aphid dysaphis plantaginea (passerini). the inoculative introduction of the specific elder aphid aphis sambuci l. (homoptera: aphididae) in late march 2002 and again in 2003 led to the complete hedgerow turning into an early and productive alternative prey reservoir for ... | 2005 | 16628887 |
| screening low fire blight susceptible crataegus species for host suitability to hawthorn leaf-curling aphids (dysaphis spp.). | the group of hawthorn leaf-curling aphids (dysaphis spp.) hosted by the common hawthorn crataegus monogyna jacq. may play an important role in the biological control of the rosy apple aphid, dysaphis plantaginea (passerini), by increasing reproduction opportunities for the indigenous hymenopteran parasitoid ephedrus persicae froggatt. unfortunately, most fruitgrowers hesitate to introduce the common hawthorn in their orchards because they fear fire blight infections which may be transmitted by t ... | 2002 | 12696414 |
| parasitation of the parasitic wasp ephedrus persicae(frogatt) on the rosy apple aphid dysaphis plantaginea (passerini). | the rosy apple aphid dysaphis plantaginea is one of the most important leaf sucking pests in pome fruit. as damage, caused by an infestation of a relatively small number of fundatrices in spring, easily exceeds the economic threshold level, pest management is crucial. besides the use of ipm-compatible pesticides, natural enemies (ladybird beetles, parasitic wasps, saw flies...) can play an additional role in controlling aphids. in europe, the solitary endoparasitoid ephedrus persicae (hymenopter ... | 2006 | 17385502 |
| feeding and egg distribution studies of heringia calcarata (diptera: syrphidae), a specialized predator of woolly apple aphid (homoptera: eriosomatidae) in virginia apple orchards. | predation by the aphidophagous syrphid fly heringia calcarata (loew) on woolly apple aphid, eriosoma lanigerum (hausmann), was studied in the laboratory and in virginia apple orchards. feeding studies compared the prey suitability of three temporally sympatric aphid pests of apple: spirea aphid, aphis spiraecola patch; rosy apple aphid, dysaphis plantaginea (passerini); and woolly apple aphid. significantly more h. calcarata larvae survived and completed development on a pure diet of woolly appl ... | 2004 | 15279258 |
| impact of agroecological infrastructures on the dynamics of dysaphis plantaginea (hemiptera: aphididae) and its natural enemies in apple orchards in northwestern france. | apple orchard production is facing new environmental and societal challenges, resulting, in particular, in strong pressure to reduce pesticide use. cider-apple production, for which the perfect visual aspect of fruits is not a marketability imperative, offers good opportunities to study production systems that are developing new agronomic strategies, which could be subsequently extended to all apple-production types. agroecological infrastructures play an important role in providing shelter, foo ... | 0 | 28460006 |
| evidence from the domestication of apple for the maintenance of autumn colours by coevolution. | the adaptive value of autumn colours is still a puzzle for evolutionary biology. it has been suggested that autumn colours are a warning signal to insects that use the trees as a host. i show that aphids (dysaphis plantaginea) avoid apple trees (malus pumila) with red leaves in autumn and that their fitness in spring is lower on these trees, which suggests that red leaves are an honest signal of the quality of the tree as a host. autumn colours are common in wild populations but not among cultiv ... | 2009 | 19369261 |
| the feasibility and efficacy of early-season releases of a generalist predator (forficula auricularia l.) to control populations of the raa (dysaphis plantaginea passerini) in southeastern france. | augmentative biological control is not commonly used in commercial orchards. we used an exclusion system to evaluate the potential of early-season releases of the european earwig (forficula auricularia l., dermaptera: forficulidae) for control of the rosy apple aphid (dysaphis plantaginea passerini, hemiptera: aphididae) in the spring of 2009 in two pesticide-free apple orchards. in order to conduct this experiment we successfully reared earwigs with a high survival rate of nymphs (more than 96% ... | 2016 | 26780826 |
| transcription of densovirus endogenous sequences in the myzus persicae genome. | integration of non-retroviral sequences in the genome of different organisms has been observed and, in some cases, a relationship of these integrations with immunity has been established. the genome of the green peach aphid, myzus persicae (clone g006), was screened for densovirus-like sequence (dls) integrations. a total of 21 dlss localized on 10 scaffolds were retrieved that mostly shared sequence identity with two aphid-infecting viruses, myzus persicae densovirus (mpdnv) and dysaphis planta ... | 2016 | 26758080 |
| weak spatial and temporal population genetic structure in the rosy apple aphid, dysaphis plantaginea, in french apple orchards. | we used eight microsatellite loci and a set of 20 aphid samples to investigate the spatial and temporal genetic structure of rosy apple aphid populations from 13 apple orchards situated in four different regions in france. genetic variability was very similar between orchard populations and between winged populations collected before sexual reproduction in the fall and populations collected from colonies in the spring. a very small proportion of individuals (∼2%) had identical multilocus genotyp ... | 2011 | 21701679 |
| homeopathic preparations to control the rosy apple aphid (dysaphis plantaginea pass.). | a laboratory model system with the rosy apple aphid (dysaphis plantaginea pass.) on apple seedlings was developed to study the effects of homeopathic preparations on this apple pest. the assessment included the substance lycopodium clavatum and a nosode of the rosy apple aphid. each preparation was applied on the substrate surface as aqueous solution of granules (6c, 15c, or 30c). controls were aqueous solutions of placebo granules or pure water. in eight independent, randomized, and blinded exp ... | 2010 | 20062949 |
| female-induced increase of host-plant volatiles enhance specific attraction of aphid male dysaphis plantaginea (homoptera: aphididae) to the sex pheromone. | all aphid species studied so far share the same sex pheromone components, nepetalactol and nepetalactone. variation by different enantiomers and blends of the two components released by different aphid species are limited and can only partially explain species-specific attraction of males to females. while some host-plant odours are known to enhance specific attraction of aphid species, herbivore-induced plant volatiles that synergise attractiveness to the sex pheromone are unknown. here, we dem ... | 2009 | 19224664 |
| resistance of apple cultivars to dysaphis plantaginea (hemiptera: aphididae): role of tree phenology in infestation avoidance. | to test the importance of flowering phenology in damage caused to apple cultivars by rosy apple aphid, dysaphis plantaginea (passerini) (hemiptera: aphididae), susceptibility of 16 cultivars was compared in greenhouse conditions after infestation with aptera and in the field after natural tree colonization. flowering phenology was recorded in the field for all the cultivars. in both greenhouse and field trials, there were differences among cultivars with respect to aphid infestation and damage. ... | 2007 | 18284746 |
| conservation biological control of rosy apple aphid, dysaphis plantaginea (passerini), in eastern north america. | because of the potentially serious damage rosy apple aphid, dysaphis plantaginea (passerini) (homoptera: aphididae), can cause to apple fruit and branch development, prophylactic insecticides are often used for control. if biological control could be relied on, the amount of pesticide applied in orchards could be reduced. this study examined biological control of rosy apple aphid in eastern west virginia and the potential for enhancement through conservation biological control, in particular, th ... | 2007 | 18284737 |
| structure, ratios and patterns of release in the sex pheromone of an aphid, dysaphis plantaginea. | insect communication is primarily via chemicals. in aphidinae aphids, the structure and ratio of iridoid (monoterpenoid) chemicals are known to be important components of the sex pheromone. however, for enhanced species specificity, it has been suggested that release of sex pheromone might be restricted to a narrow time period within the diel cycle. here, we determine the structure, ratios and release patterns of iridoid chemicals produced by a serious global pest, the rosy apple aphid, dysaphis ... | 2007 | 18055622 |
| comparison of glass vessels and plastic bags for enclosing living plant parts for headspace analysis. | plants release volatile chemicals into their surrounding air space that can affect the physiology of neighboring plants and influence the behavior of insects. in studying these interactions, it is desirable to collect volatiles from plants that have not been excised and are growing under as natural conditions as possible. we compared a vessel of borosilicate glass and nylon-6 or polyester [poly(ethyleneterephthalate) or pet] cooking bags for enclosing plants during collection of volatiles. a pus ... | 2006 | 16718573 |
| seasonal coincidence between rosy apple aphid fundatrices and their parasitoids: implications for an early biological control of dysaphis plantaginea. | the potential contribution of the aphid parasitoid ephedrus persicae froggatt (hymenoptera: braconidae, aphidiinae) in regulating stem mothers of the rosy apple aphid dysaphis plantaginea (passerini) (homoptera: aphididae) was investigated in culture conditions using both species' phenological emergence data in spring and host stage suitability trials. in 2003, emergence of e. persicae started on april 1st, i.e., 108.2 degree-days (base: 4.5 degrees c; start date: january 1st) later than its hos ... | 2005 | 16628908 |
| [action of scotophases of varying durations in circadian, ultra- and infracircadian rhythms on the production of winged gynopara of dysaphis plantaginea pass. (homoptera, aphididae)]. | | 1967 | 4965116 |
| [factors conditioning the appearance of males in the aphid dysaphis plantaginea pass. (homoptera, aphididae)]. | | 1965 | 14308219 |