Host plants: Dialeurodes citri is polyphagous; among citrus species and varieties it prefers orange and easy peeler cultivars. Morphology: The. Dialeurodes citri (Riley et Howard) (Coutin R. / OPIE) Damage on lemon Leaves are curved and the underside is coated with honeydew and sooty moulds. Dialeurodes citri first appeared in California in , but never became a serious pest (Kennett et al. ). Citrus whitefly was found in France around
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Occasionally a yellow fungus is present. The nymphs, after the first instar, are flattened, oval, and are similar in appearance to the early instars of the unarmored scale insects. Further injury is caused by sooty mold fungus which grows over fruit and foliage in the copious amount of honeydew excreted by the whitefly. Dialeurofes female lays her pale yellow eggs scattered singly on the underside of leaves, particularly young ones.
Its main host are citrus, but it also feeds on a variety of other families of plants. Larvae that had almost completed their development and young pupae of both sexes of D.
Sooty mould growth is also abundant. Colourless or yellowish, oval to broadly oval.
EPPO Global Database
Insect Pests of Farm, Garden, and Orchard. British Museum Natural HistoryLondon. Transactions and Proceedings of the New Zealand Institute 28 n. Generate a print friendly version containing only the sections you need.
EENY/IN Citrus Whitefly, Dialeurodes citri (Ashmead) (Insecta: Hemiptera: Aleyrodidae)
Damage is mostly due to the copious amounts of honeydew secreted by the nymphs and colonized by sootymold fungi. The inner, shaded parts dialeurode trees are preferred for oviposition. Experiments on the biological control of Dialeurodes citri Ashm. In large commercial plantings of citrus, citrus whitefly and cloudywinged whitefly are largely controlled in rainy weather by whitefly fungi. Two generations per year occur in Corsica and Spain Onillon et al.
The orange and other citrus fruits, from seed to market, with insects beneficial and injurious, with remedies for the latter. These fungi are generally present in all citrus groves in Florida and increase in numbers when the proper environmental conditions prevail. Occasionally a yellow dialeeurodes is present. Zashchita Rastenii Moskva8: The threshold of development is at Also, fruit covered with sooty mold will be retarded in ripening and late in coloring, especially the upper part, which may remain green after the lower portion has assumed the color of ripe fruit.
Yoldas Z; Oncuer C, Some reported records of Dialeurodes citri apply to Dialeurodes citrifolii Morgancloudywinged whitefly.
United States South America: Martin provides a key. The adults of both sexes have dialeurores pairs of wings covered with a white, powdery wax which gives the insects their common name. This is the stage used for identification purposes.
Heavily-infested trees become weak and produce small crops of insipid fruit. Coccinellidaea predator of the citrus whitefly, Dialeurodes citri Hom.: Another key that covers 16 species of whiteflies that may infest Florida citrus was developed by the Florida Department of Agriculture and Consumer Services’ Division of Plant Industry, and uses color photographs of nymphs to assist in identification.
Eggs are deposited on foliage and hatch in eight to 24 days, depending on the season. Early in the spring pupae appear, and in March and April adults emerge.
The fruit often must be washed before it is put on the market. Don’t need the entire report?
Dialeurodes – Wikipedia
The whitefly adult is white with a darkened area at the end of each wing. Aleyrodidae in Campania in the years This contaminate the fruit, obstructs respiration and disrupts photosynthesis, leading to leaf drop and yield reduction. They mainly feed on eggs but also on nymphs of D. Citrus is the most important host, but the following are also food plants — allamanda, banana shrub, Boston ivy, cape jasmine, chinaberry, crape myrtle, coffee, English ivy, Ficus macrophyllagardenia, green ash, jasmine, laurel cherry, lilac, cigri olive, myrtle, pear, privet, osage orange, persimmon, pomegranate, Portugal cherry, prickly ash, smilax, tree of heaven, trumpet vine, umbrella tree, water oak, and devilwood or wild olive.
Dialeurodes citri Ashmead Taxonomic placing: Notes on Taxonomy and Nomenclature Top of page D. The entire life cycle from egg to adult requires from 41 to days, but a great variation has been noted even among eggs laid on the same leaf on the same day.