I. purchasi belongs to the scale insect family Monophlebidae, the giant scales. The genus Icerya has been poorly studied and it is possible that. Icerya purchasi (Hemiptera: Margarodidae) . How to manage pests citrus cottony cushion scale, scientific name: Icerya purchasi. Univ. Calif. IPM Pest. Icerya purchasi Maskell trials with Cryptochetum iceryae and Rodolia iceryae for improved biological control of Icerya purchasi in Israel.

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Notes on Taxonomy and Nomenclature Top of page I. The next two instars migrate to the larger twigs and branches and eventually moult into the adult ‘female’ Morales, In addition, the use of insecticides prevents regulation by natural enemies, which has proved to be highly successful with this species.

File:Icerya purchasi 1.JPG

This insect moves between countries on live plant material, particularly in shipments of whole ornamental plants and fruit trees. Malathion should be avoided, purcyasi possible. Cottony cushion scale – Icerya purchasi.

British Journal of Entomology and Natural History, 17 2: However the ‘females’ are actually hermaphrodites with fertilization occurring between the eggs and the sperm of the same individual. Her Majesty’s Stationery Office. Economic Icsrya Back to Top The cottony cushion scale can severely damage trees, resets, and nursery stock.


Damage is mostly caused by sap depletion; the shoots dry up, defoliation occurs and branches or whole trees may die. Lauraceae 10 naturalised Apple, Crab-apple Malus sp. Stages of the cottony cushion scale Icerya purchasi and its natural enemy the vedalia beetle Rodolia cardinalis.

Citrus Pests

Hattingh V; Tate B, ScaleNet database, life histories. The adult females produce to bright-red, oblong eggs over a period of 2 to 3 months. Information Sources Berry, J. The recent discovery of relatively dense infestations in London, UK caused concern initially, but the natural enemy vedalia beetle, Rodolia cardinalis has apparently been accidentally introduced also; this appears to have become established in some of the London populations Salisbury and Booth, The egg sac contains about red eggs Gossard Identification tools for species of quarantine significance.

This iceryaa was last edited on 4 Julyat The originally infested Florida trees were destroyed, but infested trees appeared again in late History of Introduction and Spread Top of page I.

This scale is apparently native to Australia and made its way to California on acacia purchaxi around or and in about ten years was causing damage to citrus groves in southern California Ebeling Stems dry up, leaves wilt, fall, and branches dieback. Margarodidae as icerua pest of Plumbago zeylanica Linn. When the insect wishes to feed the stylets are then gradually pushed into the plant.

Photo 2 Lesley Ingram, Bugwood. Newly hatched nymphs are the primary dispersal stage, with dispersion known to occur by wind and by crawling. Adult female cottony cushion scale, Icerya purchasi Maskell.


cottony cushion scale – Icerya purchasi Maskell

Distribution Top of page I. Bythe problem on citrus had increased to such serious proportions that the entire citrus industry of California was threatened with destruction Bartlett, Parasitoids Five parasitoids are present in New Zealand. On the underside of the head is a short rostrum that hold the stylets used for feeding. Biological Control, 1 1: The following 2 pages uses this file: After three molts the adult begins to deposit eggs and secrete the conspicuous egg sac.

In addition to the direct damage from sap sucking, the insects also secrete honeydewon which sooty mold often grows and causes further damage to the host plant. On reaching maturity, the female produces a white, fluted, wax ovisac with a series of uniform ridges running lengthwise over the surface.

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Other Images Icerya purchasi Hemiptera: It may contain bright red, oblong eggs. Imidacloprid is especially contraindicated, since it has no effect on this species, but is very toxic to Rodolia cardinalis.