Encarsia perplexa | |
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Adult Encarsia perplexa with eggs and hatching nymphs of citrus blackfly parasite | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Hymenoptera |
Family: | Aphelinidae |
Subfamily: | Coccophaginae |
Genus: | Encarsia |
Species: | E. perplexa |
Binomial name | |
Encarsia perplexa Huang & Polaszek, 1998 | |
Synonyms | |
Encarsia opulenta |
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. [1]
This wasp is a native of India and Vietnam. [2] It has been introduced to and has established itself in Barbados, Cuba, Jamaica, Mexico, Salvador, Venezuela, the USA (Florida, Texas and Hawaii), Kenya and Oman, for the purpose of controlling citrus blackfly. [1]
The female is just over one millimetre long with antennae 0.8 millimetre in length. The thorax is straw coloured, the wings are transparent with a smoky patch in the centre and the legs are whitish. The abdomen is straw-coloured at the front and dark brown behind with a dark-coloured ovipositor 0.5 millimetres long. The male is smaller, averaging 0.75 millimetres in length and is a uniform dark brown. [3]
After mating, a female lays diploid eggs in nymphs of the citrus blackfly. When available, a second instar nymph is selected and each egg will eventually produce a female adult. At 24 °C in the laboratory, it takes 30 to 35 days from egg-laying to adult emergence. Unmated females lay haploid eggs in the fully developed larvae of their own species. [1] These hatch out into males, a process known as adelphoparasitism. [4] The sex ratio among adults in the field is one male to every seven females. Encarsia perplexa is itself parasitized by Encarsia smithi which was accidentally introduced into Florida in the 1970s. [1]
The only hosts that have been identified for Encarsia perplexa are Aleurocanthus woglumi and Aleurocanthus incertus , another whitefly. [2] This means that introducing the species into a citrus growing area is unlikely to have adverse ecological side effects. Amitus hesperidum is another citrus blackfly parasitoid that has been used alongside E. perplexa to control the pest. It reproduces rapidly and can produce up to seventy progeny per female and is very successful at controlling heavy infestations. E. perplexa multiplies more slowly but is better at scouting for outlying blackflies and is more effective when populations of potential hosts are lower. [5]
In Hawaii, both species were introduced in 1999 after the citrus blackfly was discovered there for the first time the previous year. They rapidly became established and were soon controlling the pest on the island of Oahu. Later releases on other islands in the group have also been an effective, though not immediate, means of reducing infestations. [6]
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.
Mole crickets are members of the insect family Gryllotalpidae, in the order Orthoptera. Mole crickets are cylindrical-bodied, fossorial insects about 3–5 cm (1.2–2.0 in) long as adults, with small eyes and shovel-like fore limbs highly developed for burrowing. They are present in many parts of the world and where they have arrived in new regions, may become agricultural pests.
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.
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. More rarely, parasitoid wasps may use plant seeds as hosts, such as Torymus druparum.
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.
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.
A wasp is any insect of the narrow-waisted suborder Apocrita of the order Hymenoptera which is neither a bee nor an ant; this excludes the broad-waisted sawflies (Symphyta), which look somewhat like wasps, but are in a separate suborder. The wasps do not constitute a clade, a complete natural group with a single ancestor, as bees and ants are deeply nested within the wasps, having evolved from wasp ancestors. Wasps that are members of the clade Aculeata can sting their prey.
Aphis gossypii is a tiny insect, an aphid ("greenfly") in the superfamily Aphidoidea in the order Hemiptera. It is a true bug and sucks sap from plants. It is a widely distributed pest of a variety of agricultural crops in the families Cucurbitaceae, Rutaceae and Malvaceae. Common names include cotton aphid, melon aphid and melon and cotton aphid.
Trichopoda pennipes is a species of feather-legged fly in the dipteran family Tachinidae.
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. The parasitic wasps, Encarsia perplexa and Amitus hesperidum can help control the pest.
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.
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.
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.
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.
Tamarixia radiata, the Asian citrus cyllid parasitoid, is an hymenopteran wasp from the family Eulophidae which was discovered in the 1920s in the area of northwestern India (Punjab), now Pakistan. It is a parasitoid of the Asian citrus psyllid, an economically important pest of citrus crops around the world and a vector for Citrus greening disease.
Encarsia perniciosi is a tiny parasitic wasp, a parasitoid of the California red scale and the San Jose scale on citrus in California.
Neodusmetia sangwani is an encyrtid parasitoid from India that was used in classical biological control of the Rhodesgrass Scale, Antonina graminis (Maskell) (Pseudococcidae) which is a major pest of grasses outside of its native range in Asia. The parasitoid was successfully controlled the scale infestation in Texas in the 1950s and 60s. It is considered among the most successful examples of classical biological control.
Aleurocanthus spiniferus, the citrus spiny whitefly, is an important pest of citrus and tea plants. They are part of the order Hemiptera, and the family Aleyrodidae, where more than 1550 species have been described. A. spiniferus is indigenous to parts of tropical Asia, where it was first discovered in Japan. Since its discovery, it has now spread to numerous continents including Africa, Australia, America, Pacific Islands and Italy. Wherever it is found, it has become a highly destructive pest. Two populations of A. spiniferus have been found according to the plant or crop they infest: the citrus spiny whitefly, as well as the tea spiny 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.