Aleurocanthus woglumi

Last updated

Aleurocanthus woglumi
Aleurocanthus woglumi 5194004.jpg
Citrus blackfly
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hemiptera
Suborder: Sternorrhyncha
Family: Aleyrodidae
Genus: Aleurocanthus
Species:
A. woglumi
Binomial name
Aleurocanthus woglumi
Ashby, 1915

Aleurocanthus woglumi is a species of whitefly in the family Aleyrodidae. It is a pest of citrus crops, and is commonly known as the citrus blackfly because of its slate-blue colour. It originated in Asia, but has spread to other parts of the world. [1] The parasitic wasps, Encarsia perplexa and Amitus hesperidum can help control the pest. [2]

Contents

Distribution

This species is native to India, but also occurs in other parts of Asia, Africa, Central and South America, Mexico, the West Indies, Jamaica, and the United States (Florida, Texas, and Hawaii). [3]

Host species

The citrus blackfly is found on over 300 host plant species, [4] but citrus trees such as lemon, orange and pomelo are most heavily infested. Noncitrus trees and shrubs, when they grow by themselves, are not normally attacked by this insect, but they may be when they grow close to heavy infestations on citrus. In Hawaii, such trees as mango, avocado, pink tecoma, and surinam cherry have hosted colonies. [3]

Lifecycle

Nymphs hatching from eggs Aleurocanthus woglumi 5194014.jpg
Nymphs hatching from eggs
Pupae and eggs Aleurocanthus woglumi 5194011.jpg
Pupae and eggs

The female blackfly lays batches of eggs in a spiral pattern on the undersides of leaves. The eggs are golden-brown, but darken before hatching, [3] which happens in seven to 10 days. [5]

The nymph moults three times. The first instar is a brown, elongated oval shape, about 0.30 mm (3256 in) long with two transparent filaments curling back over the body. The second instar is a darker brown and has short spines on its body. It measures about 0.40 mm (164 in) long. The third instar is glossy black with many stout spines and measures about 0.87 millimetres (9256 in) long by 0.74 mm (7256 in) wide. The larval stages last three to 9 weeks. [1]

The pupa is ovate and black, with short bristles and a marginal fringe of waxy secretion. [5]

The adult, when it first emerges, has a pale-yellow head, whitish legs and reddish-brown eyes. Soon afterwards, it darkens, developing a fine covering of waxy powder which gives it a slate-blue appearance. [5] The wings are angled and held in a tented fashion. The whole lifecycle takes from 45 to 130 days, depending largely on the temperature. [1]

Damage

The principal harm done by the citrus blackfly is the sucking of the tree's sap, which deprives it of both water and nutrients. The excretion of honeydew coats the leaf surfaces and encourages the growth of sooty mold. This can severely impair both leaf respiration and photosynthesis. The combination of all these factors causes a decline in the health and vigour of the tree and a reduction in fruit yield. [3]

Management

The citrus blackfly has a number of natural enemies. The most effective agents for controlling it in Florida are the parasitic wasps, Encarsia perplexa [6] and Amitus hesperidum . [7] The former has a lower rate of reproduction than does A. hesperidum, but is better able to search out suitable hosts. [8] [9] The latter is well synchronized with its host, as adult female wasps are ready to lay their eggs at about the same time as suitable larval stages of the blackfly are present. [10] These species have been used in biological control of the pest. For example, both species were introduced into Hawaii in 1999 after discovery of the presence of the citrus blackfly the previous year. Both wasps have succeeded in establishing themselves and are helping to reduce the damage done by the pest. [3]

The use of insecticides may help to control infestations temporarily, but this is not advised because of the adverse effects on the environment and any existing predators. The application of an oil emulsion may be effective and less toxic. A sufficiency of water and appropriate applications of fertiliser will encourage growth and minimise damage. [3]

Related Research Articles

<span class="mw-page-title-main">Whitefly</span> Family of insects

Whiteflies are Hemipterans that typically feed on the undersides of plant leaves. They comprise the family Aleyrodidae, the only family in the superfamily Aleyrodoidea. More than 1550 species have been described.

<span class="mw-page-title-main">Silverleaf whitefly</span> Species of true bug

The silverleaf whitefly is one of several species of whitefly that are currently important agricultural pests. A review in 2011 concluded that the silverleaf whitefly is actually a species complex containing at least 40 morphologically indistinguishable species.

<span class="mw-page-title-main">Platygastridae</span> Family of wasps

The hymenopteran family Platygastridae is a large group of exclusively parasitoid wasps, mostly very small (1–2 mm), black, and shining, with geniculate (elbowed) antennae that have an eight-segmented flagellum. The wings sometimes lack venation, though they may have slight fringes of setae.

<span class="mw-page-title-main">Parasitoid wasp</span> Group of wasps

Parasitoid wasps are a large group of hymenopteran superfamilies, with all but the wood wasps (Orussoidea) being in the wasp-waisted Apocrita. As parasitoids, they lay their eggs on or in the bodies of other arthropods, sooner or later causing the death of these hosts. Different species specialise in hosts from different insect orders, most often Lepidoptera, though some select beetles, flies, or bugs; the spider wasps (Pompilidae) exclusively attack spiders.

<span class="mw-page-title-main">Aphelinidae</span> Family of wasps

The Aphelinidae are a moderate-sized family of tiny parasitic wasps, with about 1100 described species in some 28 genera. These minute insects are challenging to study, as they deteriorate rapidly after death unless extreme care is taken, making identification of most museum specimens difficult. The larvae of the majority are primary parasitoids on Hemiptera, though other hosts are attacked, and details of the life history can be variable. Males and females may have different hosts and different life histories.

<i>Aonidiella aurantii</i> Species of true bug

Aonidiella aurantii or red scale is an armored scale insect and a major pest of citrus. It is thought to be a native of South China but has been widely dispersed by the agency of man through the movement of infected plant material. In the United States it is known as California red scale. It was first found in California between 1868 and 1875, apparently brought there on planting material imported from Australia.

<i>Encarsia formosa</i> Species of wasp

Encarsia formosa is a species of chalcidoid wasp and a well known parasitoid of greenhouse whitefly, one of the first to be used commercially for biological pest control, from the 1920s. They can use at least 15 species of whitefly as a host, including Bemisia tabaci and Aleyrodes proletella.

<i>Encarsia perplexa</i> Species of wasp

Encarsia perplexa is a tiny parasitic wasp, a parasitoid of the citrus blackfly, Aleurocanthus woglumi, which is a global pest of citrus trees. It was originally misidentified as Encarsia opulenta, but was recorded as a new species in 1998. It is a native of Asia but has been introduced to many other parts of the world as a means of controlling the citrus blackfly.

<i>Amitus hesperidum</i> Species of wasp

Amitus hesperidum is a tiny parasitic wasp. It is a parasitoid of the citrus blackfly, Aleurocanthus woglumi, an important pest of citrus trees. It is a native of Asia but has been introduced to many other parts of the world as a means of controlling the citrus blackfly.

<i>Encarsia</i> Genus of wasps

Encarsia is a large genus of minute parasitic wasps of the family Aphelinidae. The genus is very diverse with currently about 400 described species and worldwide distribution. The number of existing species is expected to be several times higher because many species are still undescribed. Encarsia is a very complex genus, with specimens showing both inter- and intra-specific variations, making morphological classification difficult.

<i>Paracoccus marginatus</i> Species of true bug

Paracoccus marginatus, commonly known as the papaya mealybug, is a small sap-sucking insect in the mealybug family, Pseudococcidae. It is found on a number of different hosts, including economically important tropical fruit trees and various ornamental plants.

Encarsia inaron is a parasitoid wasp used in the control of ash whitefly, Siphoninus phillyreae. The ash whitefly is an insect from Europe that feeds on the sap of plants, and which has become a pest in North America. E. inaron was acquired from Italy and Israel and brought to California in 1989.

<i>Planococcus citri</i> Species of true bug

Planococcus citri, commonly known as the citrus mealybug, is a species of mealybugs native to Asia. It has been introduced to the rest of the world, including Europe, the Americas, and Oceania, as an agricultural pest. It is associated with citrus, but it attacks a wide range of crop plants, ornamental plants, and wild flora.

<i>Aleurodicus dispersus</i> Species of true bug

Aleurodicus dispersus, the spiralling whitefly, is a species of small, white sap-sucking insect, a true bug in the order Hemiptera. It originated in Central America and the Caribbean region and has spread to many of the world's tropical and subtropical regions, where it has become a major pest of agricultural crops.

Baeoentedon balios, the balios wasp, is a species of chalcid wasp which was first described from China in 2014. It is a parasitoid of whiteflies of the family Aleyrodidae.

<i>Aspidiotus destructor</i> Species of true bug

Aspidiotus destructor, the coconut scale, is a species of armoured scale insect in the family Diaspididae, found in many tropical and subtropical parts of the world. It is a serious pest of coconut and banana, and attacks a range of other fruiting trees and ornamental plants.

<i>Aleurocanthus spiniferus</i> Species of true bug

Aleurocanthus spiniferus, the citrus spiny whitefly, is an insect native to Asia. It is considered an invasive pest, notably affecting citrus and tea plants. They are part of the whitefly family.

Aleurotrachelus atratus better known as the palm-infesting whitefly is an invasive species that affects coconut palms. Originally, this species was only prevalent in Brazil and was known to feed on coconuts native to this country. Now, the species has migrated to the tropics and subtropics and is invasive in many other countries. Aleurotrachelus is one of the largest genus, containing 74 species.

Aleurodicus cocois, commonly known as the coconut whitefly, is a species of whitefly in the family Aleyrodidae; it feeds on coconut and other palm trees in South America and the Caribbean region.

<i>Orchamoplatus citri</i> Species of whitefly

Orchamoplatus citri, commonly known as the Australian citrus whitefly, is a whitefly species in the genus Orchamoplatus. It is found across Australia and New Zealand, primarily foraging on the leaves of citrus trees.

References

  1. 1 2 3 Dietz, Harry F.; Zetek, James (1920). The black fly of citrus and other subtropical plants. Washington, D.C.: U.S. Dept. of Agriculture. doi:10.5962/bhl.title.108531.
  2. Browning HW, Childers CC, Stansly PA, Peña J, Rogers ME. (November 2008). 2009 Florida citrus pest management guide: soft-bodied insects attacking foliage and fruit. EDIS. ENY-604.
  3. 1 2 3 4 5 6 Governance document [ permanent dead link ]
  4. "citrus blackfly - Aleurocanthus woglumi Ashby". Featured Creatures: Entomology & Nematology. University of Florida . Retrieved 2023-03-25.
  5. 1 2 3 Dowell RV, Cherry RH, Fitzpatrick GE, Reinert JA, Knapp JL. 1981. Biology, plant-insect relations, and control of the citrus blackfly. Florida Agricultural Experiment Station Bulletin 818: 1-48.
  6. Huang, J.; Polaszek, A. (December 1998). "A revision of the Chinese species of Encarsia Förster (Hymenoptera: Aphelinidae): parasitoids of whiteflies, scale insects and aphids (Hemiptera: Aleyrodidae, Diaspididae, Aphidoidea)" . Journal of Natural History. 32 (12): 1825–1966. Bibcode:1998JNatH..32.1825H. doi:10.1080/00222939800770911. ISSN   0022-2933.
  7. Hart, W. G.; Selhime, A.; Harlan, D. P.; Ingle, S. J.; Sanchez, R. M.; Rhode, R. H.; Garcia, C. A.; Caballero, J.; Garcia, R. L. (December 1978). "The introduction and establishment of parasites of citrus blackfly,Aleurocanthus woglumi in Florida [Hem.: Aleyrodidae]" . Entomophaga. 23 (4): 361–366. doi:10.1007/BF02373053. ISSN   0013-8959. S2CID   29934946.
  8. Nguyen Ru. 1987. Encarsia opulenta (Silvestri) a parasite of Aleurocanthus woglumi Ashby (Hemiptera: Atherinidae). Florida Department of Agriculture & Consumer Services, Division of Plant Industry. Entomology Circular 301. 2 p.
  9. Smith HD, Maltby HL, Jimenez EJ. 1964. Biological control of the citrus blackfly in Mexico. USDA-ARS. Technical Bulletin No. 1311: 1-30
  10. Nguyen, Ru; Brazzel, R.; Poucher, C. (1983-06-01). "Population Density of the Citrus Blackfly, Aleurocanthus woglumi Ashby (Homoptera: Aleyrodidae), and Its Parasites in Urban Florida in 1979 –1981". Environmental Entomology. 12 (3): 878–884. doi: 10.1093/ee/12.3.878 . ISSN   1938-2936.