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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Wide host range of, mostly, woody plants. Cottony cushion scales retain their legs, eyes, and antennae for their entire life and remain mobile. Effect of Buprofezin on Icerya purchasi and Planococcus citri. Florida Agricultural Experiment Station Bulletin The control of the cottony-cushion scale was the first outstanding example iecrya the successful biological control of a pest by an introduced natural enemy.

The vedalia beetleRodolia cardinalis Mulsantwas introduced into California in for the biological control of the cottony cushion scale DeBach Indian Forester, 2: Adult males are uncommon and do not live long.

Datasheet Icerya purchasi cottony cushion scale. Polygonaceae 9 indigenous, non-endemic Ngaio Myoporum laetum G. Such fouling frequently results in the growth of sooty moulds over the leaf surfaces, which blocks light from the mesophyll, so reducing photosynthesis.

Additional Information Biological control of pests Biological control of aphids and other herbivorous pests can reduce the impact purchaso the pests and the need to use insecticides. The legs, antennae and body hairs are conspicuously black. In areas with extreme winters, which kill off the vedalia populations, periodic re-introduction has been necessary.


It excretes the excess water and sugar, which is called honeydew. Compositae purchadi endemic Pittosporum bracteolatum Endl. They have one pair of dusky wings. Adults can be found on the branches or trunks of trees. Matings of a male and hermaphrodite will produce both males and hermaphrodites. Icerya purchasi Maskell Insecta: This insect moves between countries on live plant material, particularly in shipments of whole ornamental plants and fruit trees.

Common Name

The older nymphs continue to feed, but migrate to the larger twigs, and finally, as adults, they settle on the larger branches and trunk.

Coccoidea icerja in Libya, with new records of their host plants. CIE, ; Tao, ; Wong et al. 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.

Icerya purchasi Maskell, cottony cushion scale Homoptera: Margarodidae in London gardens. Studies in inland California Quezada and DeBach, have shown that the two natural enemies seasonally share their prey in different proportions and are fairly even in their competitive pudchasi, Rodolia usually taking more prey during summer and autumn and Cryptochaetum taking more during winter and early spring.

Photograph by Paul M. Damage is mostly caused by sap depletion; the shoots dry up, defoliation occurs and branches or whole trees may die.

Fact Sheet: Cottony cushion scale | Citrus Pests

True males are uncommon to rare overall, and in many infestations are not present. Walking, flying and dispersal The nymphs, adult females and males have legs large enough for walking.


The nymphs and adult females produce long, hair-like, transparent rods of wax from the body. Male nymphs are similar in appearance to those of the female. The body is partially or entirely covered with yellowish or white wax. Risk of Introduction Top of page I.

Upcoming Events Discussioninsects and people from the BugGuide Gathering in VirginiaJuly Photos of insects and people from the gathering in WisconsinJuly Photos of insects and people from the gathering in VirginiaJune First instar crawler of the cottony cushion scale, Icerya purchasi Maskell. The scale, adults and nymphs, sucks sap and weaken plants. Copious honeydew excreted by the scales coats the leaves, res Photograph by Lyle J. An annotated check-list of the insects and allied terrestrial arthropods of Barbados.

The number of eggs produced depends on the body size, condition of the host and climatic conditions.

CIE, ; Tao, Annual Review of Entomology, Photograph by Division of Plant Industry. Israel Journal of Entomology 3: More information about modern web browsers can be found at http: Their life cycle is highly temperature dependent, as the length of time in each stage of life is longer in cold temperatures than purchassi temperatures. Nymphs can be wind-blown to new locations, crawl to nearby plants, or possibly hitchhike on other animals.

Monophlebidaewhich if uncontrolled is a serious pest of citrus trees. Pupation occurs in a fluffy, oblong white cocoon.