Carambola fruit fly | |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Diptera |
Family: | Tephritidae |
Genus: | Bactrocera |
Species: | B. carambolae |
Binomial name | |
Bactrocera carambolae Drew & Hancock, 1994 | |
Bactrocera carambolae, also known as the carambola fruit fly, is a fruit fly species in the family Tephritidae, and is native to Asia. [1] [2] This species was described by Drew and Hancock in 1994. [3] [4]
Bactrocera carambolae are specifically native to Malaysia, southern Thailand and western Indonesia. [5] In past years, this species has invaded South America via the trade of fruits from Indonesia. [1] This species is known as a major exotic pest, labelled as high priority in the Tropical Fruit Industry Biosecurity Plan and a quarantine pest in Brazil. [1] [6]
Bactrocera carambolae is a member of the Oriental fruit fly Bactrocera dorsalis species complex and are genetically similar except for slight differences in nuclear and mitochondrial DNA. [2] From DNA analyses it was determined that B. carambolae forms a reciprocally monophyletic sister group to a larger clade containing the B. dorsalis species complex. [7]
Bactrocera carambolae can be difficult to distinguish from other B. dorsalis complex species. This species is generally characterized by a predominantly black thorax, while featuring abdominal segments with brown lateral posterior markings and a medial longitudinal black band over all three tergum. [7] This species also features a yellow scutellum; triangle shaped portion of exoskeleton located between the base of the wings. In addition to other Diptera, this species has one pair of membranous wings, with hind wings reduced to knob-like structures. The head of this species is reddish brown with one pair of oval, black compound eyes, and sucking/piercing mouthparts. This species can reach a length of 6 to 8 mm (0.6 cm to 0.8 cm).
Female B. carambolae can be differentiated from male B. carambolae by observation of longer abdomens, and an ovipositor on the posterior end of the abdominal segments, where as males have shorter abdomens and a more rounded tip of their abdominal segments. [7] Compared to other members of the B. dorsalis complex, B. carambolae have shorter male reproductive organs, known as aedeagi, and broader costal bands on their wings. [7]
Bactrocera carambolae are a polyphagous species which infects over 100 different host plants, including avocado, guava, mango, papaya and orange, among several others. [5] [8] The adult female B. carambolae lays her eggs under the skin of host fruits, which take a maximum of two days to hatch. Once the larvae hatch, they immediately begin feeding on the fruit. Following seven to ten days, the fruit matures and falls to the ground below, where the larvae pupates into the soil; emerging approximately one week later. [9] The adult flies take approximately three weeks to fully mature, making the full life cycle last roughly 35 days. [8] The development rate of immature stages of B. carambolae increases with increased temperature. [9]
Different bacterial communities are associated with different developmental stages of B. carambolae, and includes four major phyla; Actinomycetota, Bacteroidota, Bacillota and Pseudomonadota. [10] Proteobacteria are dominantly present in every life stage, and Bacteroidetes are at largest in the larval and pupal stages. [10] The large abundance of Proteobacteria are essential in the act of courtship and reproduction of not only B. carambolae, but Bactrocera fruit flies in general. [10]
Bactrocera carambolae often feed prior to depositing eggs under the skin of a fruit, therefore you can characterize a fruit that has been fed on by the likelihood of dark spots, or imperfections. [1] Dark spots on the skin of fruits are induced by the female carambola fruit fly laying her eggs. Sometimes there may be no symptoms of infestation on the outside of the fruit following feeding, however dark spots are seen especially on carambola, cherry and guava fruits. [7] Carambola fruit flies prefer to feed on tropical fruits, such as mangos, papayas, and oranges, using their proboscis to pierce the skin and suck liquids from the underlying flesh. [5]
Only adult B. carambolae are capable of mating through sexual reproduction, although the larval stage is capable of producing pheromones to a certain degree. [3] Male B. carambolae are strongly attracted to methyl eugenol (ME), which is a secondary plant compound found worldwide. [3] As they feed on this compound, they convert it into a phenylpropanoid known as (E)-coniferyl alcohol (ECF). [3] This new compound is stored in the rectal gland of the male, ready to be released as a sex pheromone during courtship. [3] Endogenous production of major compound 6-oxo-1-nonanol, and minor compound N-3-methylbutyl acetamide, also contribute to courtship and reproduction. They are stored in the male rectal gland, and when released into the air they create upwind flight via zigzag movement, attracting a significant number of female B. carambolae for courtship. [11] The production of all three endogenous compounds increase with age, reaching its maximum at sexual maturity. [3] [11] The mating period of this species correlates with the time of dusk. [11]
The endogenous volatile, 6-oxo-1-nonanol, produced by male B. carambolae is also used a deterrent for predators, such as several species of gecko. [12] The production of this endogenous compound is age-related. The gecko is an avid consumer of immature carambola larvae, however their consumption greatly decreases when it comes to sexually mature male B. carambolae. [12] This effect is also seen on female B. carambolae, who do not naturally create 6-oxo-1-nonanol, when extracted male volatiles are topically applied to the thorax. [12]
Bactrocera carambolae threaten the economy, diversity, food security, and human health. Total crop failure is common in regions that have been hit with intense fruit fly invasions. [1] The economic losses through invasions by the carambola fruit fly, and those alike, raise a major concern for farmers and government agencies. [1] The plant hosts that are most commonly affected, such as papaya, mango, avocado, are of economic importance. [1] Along with carambola fruit fly invasion comes the risk of increased pesticide and how those chemicals have negative consequences for the environment. [1] In Brazil B. carambolae has been found in 21 host fruits, and is at great risk for dispersal of these pests due to the year-round high temperatures and being a major sector for fruit farming. [8]
Amazonian isolates of Metarhizium, entomopathogenic fungi, are an effective tool in the control of B. carambolae. [6] In both non-sterile and sterile soil treated with Metarhizium,B. carambolae larvae and pupae perish, and those that do not perish, but grow into adults, decease within five days of emergence from the soil. [6] It is important to consider that carambola fruit flies are highly fertile and long-lived when considering prevention and control techniques.
Wrapping fruit in newspaper, brown paper bag, or a sleeve, is one of the most effective control methods. [5] Wrapping provides a physical barrier to the skin of the fruit, inhibiting the deposition of eggs. This method becomes even more effective when the fruit is wrapped before ripening, as most B. carambolae attack following ripening. [5] [8]
Bait sprays are more environmentally acceptable variants of chemical control compared to cover sprays, and consist of an insecticide and a protein bait. [5] B. carambolae are attracted to the scent of ammonia present in the insecticide, therefore it can be applied to only a small amount of spots in a crop and remain effective. [5]
Guava is a common tropical fruit cultivated in many tropical and subtropical regions. The common guava Psidium guajava is a small tree in the myrtle family (Myrtaceae), native to Mexico, Central America, the Caribbean and northern South America. The name guava is also given to some other species in the genus Psidium such as strawberry guava and to the pineapple guava, Feijoa sellowiana. In 2019, 55 million tonnes of guavas were produced worldwide, led by India with 45% of the total. Botanically, guavas are berries.
The Tephritidae are one of two fly families referred to as fruit flies, the other family being the Drosophilidae. The family Tephritidae does not include the biological model organisms of the genus Drosophila, which is often called the "common fruit fly". Nearly 5,000 described species of tephritid fruit fly are categorized in almost 500 genera of the Tephritidae. Description, recategorization, and genetic analyses are constantly changing the taxonomy of this family. To distinguish them from the Drosophilidae, the Tephritidae are sometimes called peacock flies, in reference to their elaborate and colorful markings. The name comes from the Greek τεφρος, tephros, meaning "ash grey". They are found in all the biogeographic realms.
The Queensland fruit fly is a species of fly in the family Tephritidae in the insect order Diptera. B. tryoni is native to subtropical coastal Queensland and northern New South Wales. They are active during the day, but mate at night. B. tryoni lay their eggs in fruit. The larvae then hatch and proceed to consume the fruit, causing the fruit to decay and drop prematurely. B. tryoni are responsible for an estimated $28.5 million a year in damage to Australian crops and are the most costly horticultural pest in Australia. Up to 100% of exposed fruit can be destroyed due to an infestation of this fly species. Previously, pesticides were used to eliminate B. tryoni from damaging crops. However, these chemicals are now banned. Thus, experts devoted to B. tryoni control have transitioned to studying this pests' behaviors to determine a new method of elimination.
A semiochemical, from the Greek σημεῖον (semeion), meaning "signal", is a chemical substance or mixture released by an organism that affects the behaviors of other individuals. Semiochemical communication can be divided into two broad classes: communication between individuals of the same species (intraspecific) or communication between different species (interspecific).
The olive fruit fly is a species of fruit fly which belongs to the subfamily Dacinae. It is a phytophagous species whose larvae feed on the fruit of olive trees, hence the common name. It is considered a serious pest in the cultivation of olives.
Ceratitis capitata, commonly known as the Mediterranean fruit fly or medfly, is a yellow-and-brown fly native to sub-Saharan Africa. It has no near relatives in the Western Hemisphere and is considered to be one of the most destructive fruit pests in the world. There have been occasional medfly infestations in California, Florida, and Texas that require extensive eradication efforts to prevent the fly from establishing itself in the United States.
Bactrocera is a large genus of tephritid fruit flies, with close to 500 species currently described and accepted.
Bactrocera correcta is a species of tephritid fruit flies that is widely distributed in Southeast Asia. It is a serious pest species with a broad host range and has caused major infestations in Vietnam and Thailand.
Bactrocera dorsalis, previously known as Dacus dorsalis and commonly referred to as the oriental fruit fly, is a species of tephritid fruit fly that is endemic to Southeast Asia. It is one of the major pest species in the genus Bactrocera with a broad host range of cultivated and wild fruits. Male B. dorsalis respond strongly to methyl eugenol, which is used to monitor and estimate populations, as well as to annihilate males as a form of pest control. They are also important pollinators and visitors of wild orchids, Bulbophyllum cheiri and Bulbophyllum vinaceum in Southeast Asia, which lure the flies using methyl eugenol.
Raspberry ketone is a natural phenolic compound that is the primary aroma compound of red raspberries.
Bactrocera cucurbitae, the melon fly, is a fruit fly of the family Tephritidae. It is a serious agricultural pest, particularly in Hawaii.
Anastrepha is the most diverse genus in the American tropics and subtropics. Currently, it comprises more than 300 described species, including nine major pest species, such as the Mexican fruit fly, the South American fruit fly, the West Indian fruit fly, the sapote fruit fly, the Caribbean fruit fly, the American guava fruit fly, and the pumpkin fruit fly, as well as the papaya fruit fly. As some of their names suggest, these pest species are one of the most numerous and damaging groups of insects in their native range, plaguing commercial fruits such as citrus, mango, guava, and papaya.
Anastrepha ludens, the Mexican fruit fly or Mexfly, is a species of fly of the Anastrepha genus in the Tephritidae family. It is closely related to the Caribbean fruit fly Anastrepha suspensa, and the papaya fruit fly Anastrepha curvicauda.
Bactrocera (Bactrocera) invadens is the name given to tephritid fruit flies that were introduced to East Africa from Sri Lanka and subsequently invaded practically the whole of Sub-Saharan Africa, hence the species name "invadens". It was first shown to be the same biological species as B. dorsalis s.s. by possessing identical sex pheromonal components after consumption of methyl eugenol, and also based on CO1 and rDNA sequences. Subsequently, it was agreed that B. invadens, B. papayae and B. philippinensis be synonymized as B. dorsalis. To counteract its detrimental effects to the fruit business, the industry resorts to cold treatment in order to get rid of the larvae.
Anastrepha suspensa, known as the Caribbean fruit fly, the Greater Antillean fruit fly, guava fruit fly, or the Caribfly, is a species of tephritid fruit fly. As the names suggest, these flies feed on and develop in a variety of fruits, primarily in the Caribbean. They mainly infest mature to overripe fruits. While thought to have originated in Cuba, the Caribbean fruit fly can now also be found in Florida, Hispaniola, and Puerto Rico.
Ceratitis rosa, the Natal fruit fly or Natal fly, a species from the family Tephritidae of the order Diptera, is a fruit fly. It was described in 1887 from specimens of Delagoa Bay, Mozambique.
Myopites stylatus is a species of tephritid or fruit flies in the family Tephritidae.
An attractant is any chemical that attracts an organism, e.g. i) synthetic lures; ii) aggregation and sex pheromones ; and iii) synomone
Bactrocera passiflorae, the Fijian fruit fly, is a species of fly in the family Tephritidae in the insect order Diptera. It is native to several tropical and subtropical islands in the Pacific Ocean and is a pest of fruit crops.
Anastrepha fraterculus, known as the South American fruit fly, is a fruit fly species from the genus Anastrepha. A. fraterculus is a polyphagous, frugivorous fly that is a significant pest of commercial fruit production in South America.