Orchamoplatus mammaeferus; previously, Aleuroplatus samoanus and Orchamus samoanus.
Narrow. Southeast Asia, North America (Hawaii), Oceania. It is recorded from American Samoa, Australia, Cook Islands, Fiji1, French Polynesia, New Caledonia, and New Zealand.
Croton; other hosts are: citrus species, frangipani, jasmine, Spondias dulcis ("wi" in Fiji), sweet potato, gourds, Malay apple, allspice, and others.
Both nymphs and adults suck the sap of plants causing the leaves to become crinkled and distorted. In Fiji, it is occasionally found on the underside of croton leaves in large numbers1.
Eggs are white to brown, on stalks; they are laid in rings. The nymphs are oval, flat, and occur on the underside of the leaves with the pupae. The first nymphs are known as 'crawlers'; they have legs are active; after a short time they settle, remaining in one place, feeding and going through several moults. The pupae are also oval, about 0.75 mm long, brownish-yellow, with a coat of transparent wax forming a thin layer around the margin, and a white “tail” (Photo 1). Adults are yellow with red eyes and white, powdery wings (Photo 2).
Spread occurs when crawlers disperse over short distances, or longer when carried by wind currents, vehicles, animals, birds, or on clothing. All stages are spread in the horticultural trade of plants or plant parts.
There is little published information on the impact of this whitefly, except that it causes yellowing and distortion of croton leaves. Crotons are used as informal hedges, pot plants, and for cut foliage, and large infestations of whiteflies would affect their market value.
Look for the nymphs, pupae and adults on the undersides of leaves. Look for the characteristic shape of the pupae, the transparent wax surround, and the "tail".
Ladybird beetles Delphastus pusillus, Halmus chalybeus, Nephaspis oculatus and Serangium maculigerum feed on the croton whitefly.
If using a pesticide to control the croton whitefly, it is best to remove the worse infested foliage before spraying.
Attempts to control the whitefly using synthetic pesticides are not recommended. Spraying with pesticides may make the problem worse by destroying the biocontrol agents and prolonging the infestation. If pesticides are required, do the following:
AUTHOR Grahame Jackson
1Information from Swaine G (1971) Agricultural Zoology in Fiji. Her Majesty's Stationery Office. London; and from CABI (2015) Orchamoplatus mammaeferus (croton whitefly) Crop Protection Compendium. (www.cabi.org/cpc); and Aleyrodidae: Key to the genera. USDA, APHIS, PPQ. (http://keys.lucidcentral.org/keys/v3/whitefly/key/Aleyrodid%20Pupal%20Key%20to%20the%20Genera/Media/Html/Orchamoplatus.htm). Photo 1 Croton whitefly (Orchamoplatus mammaeferus) California Department of Food and Agriculture. (https://www.cdfa.ca.gov/plant/ppd/PDF/orchamoplatus_mammaeferus.pdf). Photo 2 MAF Plant Health & Environment Laboratory (2011) Croton Whitefly (Orchamoplatus mammaeferus) PaDIL - (http://www.padil.gov.au).
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.
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