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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Furthermore, populations lanigerm from geographically distant regions were very closely related, which can partly be explained by the fact that agricultural practices were responsible for dissemination of populations from a common ancestor to geographically distant areas.
Journal of Entomological Research, 15 4: The situation was complicated by a fungus disease, perennial apple canker, caused by the fungal pathogen Nectria ditissimawhich caused serious injury to the trees.
Eriosoma lanigerum – Bugwoodwiki
Underground populations were also significantly reduced 1 month after treatment, but no difference was found 4 months after treatment. Various authors have shown that the common earwig Forficula auricularia plays a role in controlling aphid pests. Many of the laboratory-reared aphids showed positive geotropism, but aphids collected while moving up a tree trunk in the field showed no obvious geotropic response.
This resistance is shown to be controlled by a single lanigwrum gene, Er, having little or no minor gene background.
Phenological measurements indicated that the aphids showed poor settlement, development, and survival on Er2. Hilgardia 30— We observed ratios from 1: Nitrogen levels were higher in healthy roots and in roots adjacent to galls than in galls.
Previous records of E. Support Center Support Center.
Commonwealth Institute of Entomology. The same considerations regarding the way to improve this model would also be suitable in this case. Laboratory experiments showed that the presence of the nematode in a colony of Eriosoma lanigerum increased the mortality rate.
Woolly apple aphid Eriosoma lanigerum Hausm.
Elm is the primary host species and it appears that egg production on other species, such as apple trees, is etiosoma and that eggs laid on apple always fail to hatch. Alate aphids appearing in early November produce only virginoparae, alates appearing from late November to late January produce a mixture of virginoparae and sexuales, whereas those appearing from February to April produce exclusively sexuales.
Penn State College of Agricultural Sciences.
To construct the PLS-2, the X-variables used were: Note that the natural enemies of the woolly apple aphid have been so widely incorporated into biological and integrated control programmes worldwide, that we include all other research on them in the section below on biological control.
At each orchard, aphid colonies were collected and taken back to the laboratory to sample the emerging Aphelinus mali. Chlorpyrifos an organophosphorus insecticide was found to be highly toxic to the adult wasps.
Deciduous Fruit Grower 5122—23, lanigrrum Don’t need the entire report?
Woolly aphid (Eriosoma lanigerum (Hausmann)) – Apple Best Practice Guide
Reproduction of the woolly apple aphid can take place parthenogenetically or sexually when both host plants, apple Malus domestica and elm Ulmus americana are available.
Adult parasites began their activity during the first week of April. Spatial and temporal distribution patterns of Eriosoma lanigerum Homoptera: Symptoms Top of page E.
Chrysopidaehoverflies Diptera: Galling of aerial plant erioosoma can reach the size of a walnut and interfere with lanigerjm circulation. The sexuales were apterous, had degenerate mouthparts and produced non-viable eggs.
Therefore, crop-originated parasitoids would have to accept pests from the refuge as hosts to lay eggs in, and refuge-originated parasitoids would have to accept and lay eggs in pests from the crop. Control of edaphic populations of woolly apple aphid using entomopathogenic nematodes and a systemic aphicide.
Apple Best Practice Guide
Neither cyhexatin nor penconazole had a considerable toxic effect upon the parasitoid. Winged viviparous females shown in the second picture above have a brown-black head and thorax and a brown abdomen.
Predators are not effective against subterranean aphid populations. Accepted Sep 2.
Woolly Apple Aphid
Journal of Applied Entomology, 2: Two experiments were conducted under glasshouse conditions in two consecutive years. This insect is considered a quarantine pest and its presence in or on imported fruit or plant material is prohibited in many countries. However, little information is available in Europe Theobald, ; Evenhuis,especially in Mediterranean areas.
There are two or three sensoria on antennal segment VI. Other secondary roles of wax may include individual microclimate isolation, protection from fungi, parasites and predators plus waterproofing and frost protection.