ERIOSOMA LANIGERUM PDFERIOSOMA LANIGERUM PDF

Life Cycle: Eriosoma lanigerum is an exotic species in the Middle East. In North America its primary host is the American elm tree (Ulmus. back to HYPP Zoology home page. Eriosoma lanigerum (Hausmann) Schizoneura lanigerum. Insecta, Homoptera, Pemphigidae. woolly apple aphid. Compiled by Whitney Cranshaw, Colorado State University. Eriosoma lanigerum (Hausmann) Homoptera: Eriosomatidae.

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In its native range in lnaigerum eastern North America the winged adults, or alates migrate at the end of the summer to overwinter on elms but in regions where there are egiosoma elms the fate of these alates is not known and all observed reproduction is by parthenogenesis.

In our study, low winter temperatures did not kill aerial colonies of WAA. These predators consumed larger numbers of early than later instars of Eriosoma lanigefum within the same time period. Earwigs, ladybirds and the parasitic wasp Aphelinus mali are important natural enemies of woolly aphid and usually regulate populations to below damaging levels.

Annales de la Societe Entomologique de France 1— Colonies were counted on half of each of 25 apple trees per 2 ha block.

Eriosoma lanigerum (Woolly apple aphid): identification, images, ecology, control

Population dynamics of Woolly Apple Aphid Homoptera: Disruption of root xylem, resulting in resistance to water conduction, is one mechanism by which E. Therefore, as mentioned before, earwigs may decrease WAA number of crawlers moving up, down and through the canopy.

European earwigs Forficula auricularia were found to reduce the survival of overwintering canopy colonies up to June, and this can allow their later control lznigerum the parasitoid Aphelinus mali from summer to fall.

Entomologia Experimentalis et Applicata erioskma— Distribution Maps of Pests. However, decisions regarding intervention were not markedly compromised by simply classifying the 25 trees as infested or uninfested, as opposed to counting colonies in leaf axils.

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Rates of parasitism are greater in long, narrow colonies than in round colonies of the same size because a higher proportion of woolly aphids are located on the colony margins where parasitoids concentrate their attacks. The latter could thus comprise a suitable and putative refuge for parasitoids, which could be used to increase the effectiveness of biological control. When a light source was combined with a temperature gradient, high temperatures and light were highly repellent to the aphids.

Sometimes it is possible to see a circular hole on the upper surface of the aphid which the adult wasp created when it emerged from the body of its host. Staubli A; Chapuis P, Fruit can be directly affected, through the deposition of honeydew from colonies feeding on eriisoma branches or twigs.

At low infestations, E. Observation on the fauna of arthropods from apple orchards in winter in Kyongbuk province. Kishinev Moldavian SSR, 64 pp.

Mededelingen van de Faculteit Landbouwwetenschappen Universiteit Gent friosoma— Every week throughout the year, we counted the number of earwigs per shelter. In other projects Wikimedia Commons Wikispecies.

AphID – Eriosoma lanigerum

The alate aphids are the offspring of apterous virginoparae and they occur first in November and then from late January to late April. Earwigs in combination with Aphelinus mali reduced woolly aphid infestations below the action threshold set by commercial growers.

Sexuales are apterous, have degenerate mouth parts and oviparae produce non-viable eggs. Aphid performance and feeding on Aotea Er3 were similar to Royal Gala, suggesting that some woolly apple aphids in New Zealand may have recently overcome Er3 resistance. A total of individuals from four different regions were collected and analysed. The population dynamics and its role in controlling Eriosoma lanigerum by Harmonia axyridis Pallas.

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EPPO Global Database

Aphelinidaeto common pesticides used in apple orchards in Israel. Media related to Eriosoma lanigerum at Wikimedia Commons. Every 2 weeks, the total length of the shoot and the length occupied by WAA were measured to calculate the percentage of the AI.

Of the other insecticides, imidacloprid was more toxic to the adult parasitoid than pirimicarb and triazamate. Accepted Sep 2. For every week that crawler movement and AI were evaluated, a mean value of each climatic variable was calculated, with the exception of rainfall, for which accumulated rain was used. Photo by Peggy Grebb.

The aim of this study was to provide knowledge to improve WAA management in Mediterranean areas. A very low percentage of the current apple acreage is planted on resistant rootstocks, nor are such rootstocks used for new plantings. The first-instar apterae are the forms important in dispersion. At each orchard, aphid colonies were collected and taken back to the laboratory to sample the emerging Aphelinus mali.

The transition from organophosphate insecticides to either insect growth regulators hormone analogues or neonicotinyl insecticides may also be contributing to higher pressure. Evidence of sexual reproduction of woolly apple aphid, Eriosoma lanigerumin New Zealand.

Apterous virginoparae attain a rapid rate of nymphal development, large adult size, high fecundity and high population growth rate in the spring compared to summer, autumn and winter. The net correlation between movement and mean maximum temperature was positive and significant, whereas it was insignificant for mean minimum temperature and rainfall.

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Agricultural Experiment Station Bulletin3—