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Rhynchophorus ferrugineus

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Rhynchophorus ferrugineus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Curculionidae
Genus: Rhynchophorus
Species:
R. ferrugineus
Binomial name
Rhynchophorus ferrugineus
(Olivier, 1790) [1]
Synonyms
  • Curculio ferrugineus Olivier, 1790
  • Cordyle sexmaculatus Thunberg, 1797
  • Calandra ferruginea Fabricius, 1801
  • Rhynchophorus pascha v. papuanus Kirsch, 1877
  • Rhynchophorus indostanus Chevrolat, 1882
  • Rhynchophorus signaticollis Chevrolat, 1882
  • Rhynchophorus pascha v. cinctus Faust, 1893
  • Rhynchophorus ferrugineus v. seminiger Faust, 1895
  • Rhynchophorus signaticollis v. dimidiatus Faust, 1895

The palm weevil Rhynchophorus ferrugineus is one of two species of snout beetle known as the red palm weevil, Asian palm weevil or sago palm weevil. The adult beetles are relatively large, ranging between 2 and 4 centimetres (1 and 1+1⁄2 inches) long, and are usually a rusty red colour—but many colour variants exist and have often been classified as different species (e.g., R. vulneratus). Weevil larvae can excavate holes in the trunks of palm trees up to 1 metre (3.3 ft) long, thereby weakening and eventually killing the host plant. As a result, the weevil is considered a major pest in palm plantations, including the coconut palm, date palm and oil palm.[2]

Originally from tropical Asia, the red palm weevil has spread to Africa and Europe, reaching the Mediterranean in the 1980s. It was first recorded in Spain in 1994,[3] and in France in 2006.[4] Additional infestations have been located in Malta, Italy (Tuscany, Sicily, Campania, Sardinia, Lazio, Marche, Puglia and Liguria), Croatia and Montenegro. It is also well established throughout most of Portugal, especially in the South.[5] It also has established in Morocco, Tunisia, and other North African countries.[6] The weevil was first reported in the Americas on Curaçao in January 2009[7] and sighted the same year in Aruba.[8] It was reported in the United States at Laguna Beach, California late in 2010[9][10] but this was a misidentification of the closely related species, R. vulneratus, and it did not become established.[11]

Larvae of Rhynchophorus ferrugineus are considered a delicacy in Southeast Asian cuisine. In some regions, however, larvae farming is strictly prohibited to prevent the potential devastation of plantation crops.[12]

Taxonomy

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Primarily due to the existence of numerous color forms across their ranges, the taxonomy and classification of red palm weevils has undergone a number of changes in understanding and circumscription. As such, the information in the literature should be viewed as a compilation of data which may apply to both species, depending primarily upon the biogeography; accordingly, the vast majority of publications presumably do refer to R. ferrugineus rather than vulneratus, as the former is by far the most widely invasive. The most recent genus-level revision in 1966[13] recognized two species of red palm weevil, ferrugineus and vulneratus, and for decades these were interpreted as separate taxa. A genetic study in 2004[14] concluded that vulneratus was not distinct from ferrugineus, and treated them as synonyms, a view that was accepted until 2013, when yet another genetic study[15] came to the opposite conclusion, based on more comprehensive geographic sampling. Accordingly, the "red palm weevil" species that appeared in the US was vulneratus rather than ferrugineus, though the latter is the invading species in all of the other global introductions.[15]

Distribution

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Range

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The native range of this species is considered to include Bangladesh, Cambodia, China, India, Japan, Laos, Pakistan, Philippines, Sri Lanka, Taiwan, and Vietnam; records from Indonesia, Malaysia, Myanmar, Singapore, and Thailand largely or exclusively refer to R. vulneratus.[15] R. ferrugineus has now been reported and confirmed from Albania, Algeria, Aruba, Bahrain, Bosnia and Herzegovina, Croatia, Curaçao, Cyprus, Egypt, France (incl. Corsica), Greece, Israel, Italy (incl. Sicily and Sardinia), Jordan, Kuwait, Libya, Malta, Monaco, Montenegro, Morocco, Oman, Palestine, Portugal (incl. Madeira), Qatar, Saudi Arabia, Slovenia, Spain (incl. the Balearic and Canary islands), Syria, Tunisia, Turkey, and United Arab Emirates. Records from Australia, Papua New Guinea, Samoa, the Solomon Islands, and Vanuatu[6] have not been confirmed and are likely to be specimens of R. bilineatus, a closely related species indigenous to the region.

CABI ISC range list

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[6]

Africa
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Asia
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Europe
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North America
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South America

  • Uruguay (identified in 2022)[17]
Oceania
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Hosts

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This species of red palm weevil is reported to attack 19 palm species[18] and is the worst such pest in the world.[16]: 245  Although the weevil was first reported on coconut in Southeast Asia, it has gained a foothold on date palm over the last two decades in several Middle Eastern countries, and then expanded its range to Africa and Europe.[18] This expansion has been due to the movement of infested planting material from contaminated to uninfected areas.[3] In the Mediterranean region, the red palm weevil also severely damages Phoenix canariensis. Currently, the pest is reported in almost 15% of the global coconut-growing countries and in nearly 50% of the date palm-growing countries.[19]

All known hosts of R. ferrugineus as compiled from sources by CABI ISC are: Areca catechu, Arenga pinnata, Borassus flabellifer, Brahea armata, B. edulis, Butia capitata, Calamus merrillii, Caryota cumingii, C. maxima, C. urens, Chamaerops humilis, Cocos nucifera, Corypha umbraculifera, C. utan, Elaeis guineensis, Howea forsteriana, Jubaea chilensis, Livistona chinensis, L. decora, Metroxylon sagu, Phoenix canariensis, P. dactylifera (date palm), P. sylvestris, Roystonea regia, Sabal palmetto, Trachycarpus fortunei, Washingtonia filifera, and W. robusta.[20][21] Lab studies have reared the insect on diets of Agave americana and Saccharum officinarum, but these findings have not been observed in the wild. There is evidence that the weevil prefers the 'Sukkary' cultivar of date palm to other cultivars.[22]

The palm species W. filifera and Chamaerops humilis may be moderately resistant to the red palm weevil, though both are known hosts.[23]

Life cycle

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Larva
Pupal Case
Pupa
Adult

This weevil usually infests palms younger than twenty years.[24] While the adult causes some damage through feeding, it is the burrowing of the larva into the heart of the palm that can cause the greatest mortality of trees. The adult female lays approximately two hundred eggs on new growth in the crown of the palm, at the base of young leaves, or in open lesions on the plant.[24] The egg hatches into a white, legless larva. The larva will feed on the soft fibres and terminal buds, tunneling through the internal tissue of the tree for about a month. The larvae can occasionally grow to a length of 6 to 7 centimetres (2+1⁄2 to 3 in).[13] At pupation, the larva will leave the tree and form a cocoon built of dry palm fibers in leaf litter at the base of the tree. The total life cycle takes about 3–4 months.[25]

Oviposition

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After fertilization, the adult female can lay between 300 and 500 eggs. They lay in holes they produced while searching for food, or take advantage of the cracks or wounds in a recently cut palm. At oviposition, females bend upward and the tarsi are anchored to the tissue with the spines of the third pair of legs to push the ovipositor into the tough palm tissue. After laying, the female protects and secures the eggs with a secretion that rapidly hardens around the eggs. On average, females produce 210 eggs per clutch, most of which hatch over a period of 3 days. The eggs are white, cylindrical, glossy, oval shaped, and measure 1 to 2.5 millimetres (3⁄64 to 3⁄32 in). The back of these eggs possess special 'gill cover' structures that provide the developing insect with oxygen.[citation needed]

Larvae

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The neonate larvae are yellow-white, segmented, legless, and have a chitinous head capsule that is a darker brown than the rest of the body. They have powerful horizontal conical jaws which they use to burrow from the axils of the leaves to the crown, where they feed voraciously. Upon completion of larval development, the larva will sometimes emerge from the trunk of the tree, and build a pupal case of fiber extracted from the galleries inside the palm. The larva will then undergo metamorphosis into an adult. The larva will also weave a pupal case at the base of the palm fronds within the frond itself or at the centre of the base of the plant.[24]

Adult

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A palm weevil climbing ridge
An Adult palm weevil climbing ridge.

The adult insect is an excellent flier and is able to travel great distances.[26] While they prefer to attack palms that are already infested or weakened by other stresses, they will colonize healthy palms.[27]

Predators, diseases, and parasites

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R. ferrugineus is predated by Chelisoches morio, infected by a cytoplasmic polyhedrosis virus and Metarhizium pingshaense, and parasitized by Heterorhabditis indicus, Hypoaspis spp., Praecocilenchus ferruginophorus, Scolia erratica, Steinernema carpocapsae, and Steinernema riobravis.[28]

Behaviour

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Traps for attracting and destroying (Budva, Montenegro)
Hard pruning as a way of fighting
Treated phoenix palm, which is recovering after being attacked

Studies show that this insect is attracted by ethyl acetate, 2-methoxy.4.vinylphenol, gamma-nonanoic lactone, 4SSS-ferrugineol, 50H and 4me-9-5Kt.[29]

Symptoms of infestation

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The infestation of the pest can result in yellowing and wilting of palms, that may lead to the death of the affected plant. The crown wilts first, and lower leaves will follow, due to damage to vascular tissue. Major symptoms such as crown loss or leaf wilt are usually only visible long after the palm has become infested. Secondary infections of opportunistic bacteria and fungi may occur within damaged tissues, accelerating decline. By the time these external symptoms are observed, the damage is usually sufficient to kill the tree, and the infestation may have been present for six months or longer.[24] In high-density infestations, sounds of the larvae burrowing and chewing can be heard by placing one's ear to the trunk of the palm. Recent research has been conducted using electronic listening devices or dogs trained to recognize the scent of weevils or palm decay to detect infestations at low densities earlier in the process.[24]

  • Canary Island date palm, with first obvious infestation signs
    Canary Island date palm, with first obvious infestation signs
  • Destroyed crown of CIDP
    Destroyed crown of CIDP
  • Bases of palm leaves fallen from the crown of the tree, with burrows and extracted pupal cases
    Bases of palm leaves fallen from the crown of the tree, with burrows and extracted pupal cases
  • Date palm killed by weevils
    Date palm killed by weevils

Control

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The main control method is through the application of a systemic insecticide. Insecticide is usually applied through a funnel about 5 centimetres (2 in) above the infested area of the trunk. The red palm weevil can be monitored using pheromone lures and alternative forms of control use field sanitation and mass trapping with traps baited with pheromone and plant derived semiochemicals. New alternative technologies using semiochemicals and bioinsecticides are being developed to attract the weevils to a point source and kill them. Another management technique is to drench the base of palm fronds with the entomopathogenic fungus Metarhizium robertsii (syn. M. anisopliae, Entomophthora anisopliae), or Beauveria bassiana.[30][31] An Italian company claims to have developed a microwave collar that can be used to sterilize individual trees.[citation needed] For early detection, bioacoustic analysis may be implemented by inserting a sensitive microphone into the tree and recording any produced sounds.[32][33] These sounds are analyzed by digital signal processing and artificial intelligence to decide whether they are generated by palm weevils.

Palms' natural defense against this weevil is understudied.[34] RNA interference (RNAi, a kind of gene silencing) is a recently discovered defense system in many host-pathogen systems.[34] RNAi shows promise as a breeding target when breeding palm for RPW resistance.[34]

Prevention

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As the weevil prefers to lay its eggs in softer tissues, avoiding mechanical damage to plants can help to reduce infestation. Tarring wounds after pruning a plant of dead or old leaves can also reduce the probability of infestation. The movement of plant material such as husks, dead leaves, or untreated coir from infested to uninfested areas is not recommended.[24]

Culinary uses

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Toasted grubs of the Asian palm weevil in Laos

The larval grub is considered a delicacy in Vietnam.[35] In Vietnam, the larvae are usually eaten alive with fish sauce.[36] Other methods of cooking include toasting, frying and steaming. They are eaten with sticky rice and salad or cooked with porridge. The larvae are known in the Vietnamese language as đuông dừa ("coconut beetle-larva").[35] "Sago worms" reported from other countries (e.g., East Malaysia, New Guinea) refer to different, related species of Rhynchophorus.[37]

References

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  1. ^ "Rhynchophorus ferrugineus (RHYCFE)". Global Database. European and Mediterranean Plant Protection Organization. 2002-10-21. Retrieved 2021-02-15.
  2. ^ "Rhynchophorus ferrugineus Oliver". Phytosanitary Alert System. Retrieved 2021-02-15.
  3. ^ a b M. Ferry; S. Gómez (2002). "The red palm weevil in the Mediterranean Area" (PDF). Palms. 46 (4). International Palm Society. S2CID 81168514.
  4. ^ "EPPO Reporting Service" (PDF). EPPO Reporting Service (11). Paris, France. 2006-11-01.
  5. ^ Soares, Marisa (9 February 2014). "As palmeiras ainda podem ganhar a guerra contra o escaravelho-vermelho". PÚBLICO (in Portuguese). Retrieved 2022-01-05.
  6. ^ a b c "Rhynchophorus ferrugineus (red palm weevil) CABI fact Sheet".
  7. ^ "Niet Gevonden". amigoe.com. Retrieved 2022-01-05.
  8. ^ 2010 California Farmer periodical "World's worst palm pest in state" Richardson[dead link]
  9. ^ "Destructive exotic beetle found in Laguna Beach". Orange County Register. 2010-10-04. Retrieved 2022-01-05.
  10. ^ [1] Archived 2011-09-28 at the Wayback Machine CDFA; Red Palm Weevil, Worst Known Pest of Palm Trees Detected in Laguna Beach
  11. ^ Hoddle, Mark S.; Hoddle, Christina D.; Alzubaidy, Mohammed; Kabashima, John; Nisson, J. Nicholas; Millar, Jocelyn; Dimson, Monica (2016). "The palm weevil Rhynchophorus vulneratusis eradicated from Laguna Beach". California Agriculture. 71 (1). University of California Agriculture and Natural Resources: 23–29. doi:10.3733/ca.2016a0012. ISSN 0008-0845.
  12. ^ "Chỉ thị 01/2015/CT-UBND nghiêm cấm nhân nuôi phát tán đuông dừa tỉnh Bến Tre". thuvienphapluat.vn. Retrieved 2022-01-05.
  13. ^ a b Wattanapongsiri, A. 1966. A revision of the genera Rhynchophorus and Dynamis (Coleoptera: Curculionidae). Department of Agriculture Science Bulletin 1: 1-328 (PhD).
  14. ^ Hallett, R. H.; Crespi, B. J.; Borden, J. H. (2010). "Synonymy of Rhynchophorus ferrugineus (Olivier), 1790 and R. vulneratus (Panzer), 1798 (Coleoptera, Curculionidae, Rhynchophorinae)". Journal of Natural History. 38 (22): 2863–2882. doi:10.1080/00222930310001657874. ISSN 0022-2933. S2CID 12809903.
  15. ^ a b c d e f g Rugman-Jones P.F.; Hoddle C.D.; Hoddle M.S.; Stouthamer R. (2013). "The Lesser of Two Weevils: Molecular-Genetics of Pest Palm Weevil Populations Confirm Rhynchophorus vulneratus (Panzer 1798) as a Valid Species Distinct from R. ferrugineus (Olivier 1790), and Reveal the Global Extent of Both". PLoS ONE. 8 (10): e78379. Bibcode:2013PLoSO...878379R. doi:10.1371/journal.pone.0078379. PMC 3797061. PMID 24143263.
  16. ^ a b c d Peng, Lu; Hou, Youming (2017). "Red Palm Weevil Rhynchophorus ferrugineus (Olivier)". In Wan, Fanghao; Jiang, Mingxing; Zhan, Aibin (eds.). Biological Invasions and Its Management in China. Dordrecht, Netherlands: Springer. pp. 245–256/xiv+366. doi:10.1007/978-94-024-0948-2_13. ISBN 978-94-024-0946-8. OCLC 984692367. S2CID 91164620. ISBN 978-94-024-0948-2.
  17. ^ "Alerta fitosanitaria: Picudo rojo de las palmeras" [Phytosanitary alert: Red palm weevil]. Ministerio de Ganadería, Agricultura y Pesca (in Spanish). Retrieved 2023-08-25.
  18. ^ a b Malumphy, C.; Moran, H. (2007). "Red palm weevil, Rhynchophorus ferrugineus". Plant Pest Notice. 50 (Notice 5). Central Science Laboratory: 1–3. S2CID 82005659. [2].
  19. ^ Faleiro, J.R. (2006-09-01). "A review of the issues and management of the red palm weevil Rhynchophorus ferrugineus (Coleoptera: Rhynchophoridae) in coconut and date palm during the last one hundred years". International Journal of Tropical Insect Science. 26 (3): 135–154. Bibcode:2006IJTIS..26..135F. doi:10.1079/IJT2006113 (inactive 2024-09-12). ISSN 1742-7592. S2CID 86409700. icipe. Retrieved 2021-02-15.{{cite journal}}: CS1 maint: DOI inactive as of September 2024 (link)
  20. ^ "Rhynchophorus ferrugineus (red palm weevil)#tohostPlants". Invasive Species Compendium (ISC). CABI (Centre for Agriculture and Bioscience International). 2020-12-11. Retrieved 2021-02-16.
  21. ^ "Giant Palm Weevils of the Genus Rhynchophorus (Coleoptera: Curculionidae) and Their Threat to Florida Palms" (PDF). Florida Department of Agriculture and Consumer Services, Division of Plant Industry. 18 February 2010.
  22. ^ Al-Ayedh, H. (2008). "Evaluation of Date Palm Cultivars for Rearing the Red Date Palm Weevil, Rhynchophorus ferrugineus (Coleoptera: Curculionidae)". Florida Entomologist. 91 (3). Florida Entomological Society: 353–358. doi:10.1653/0015-4040(2008)91[353:eodpcf]2.0.co;2. ISSN 0015-4040. S2CID 85771716.
  23. ^ Dembilio Ó (2009). "Are the palms Washingtonia filifera and Chamaerops humilis suitable hosts for the red palm weevil, Rhynchophorus ferrugineus (Col. Curculionidae)?". Journal of Applied Entomology. 133 (7): 565–567. doi:10.1111/j.1439-0418.2009.01385.x. S2CID 85677945.
  24. ^ a b c d e f
    Murphy, S.; Briscoe, B. (1999). "The red palm weevil as an alien invasive: biology and the prospects for biological control as a component of IPM". Biocontrol News and Information. 20 (1). CABI (CAB International): 35N–46N. ISSN 0143-1404. S2CID 52063069.
    Milosavljevic, Ivan; El-Shafie, Hamadttu; Faleiro, Romeno; Hoddle, Christina; Lewis, Michael; Hoddle, Mark (2018). "Palmageddon: the wasting of ornamental palms by invasive palm weevils, Rhynchophorus spp". Journal of Pest Science. 92 (1). Springer Science and Business Media LLC: 143–156. doi:10.1007/s10340-018-1044-3. eISSN 1612-4766. ISSN 1612-4758. S2CID 59527915.:
    These reviews cite this research.
    Abraham, V.; Al Shuaibi, M.; Faleiro, J.; Abozuhairah, R.; Vidyasagar, P. (1998). "An Integrated Management Approach for Red Palm Weevil Rhynchophorus Ferrugineus Oliv. a Key Pest of Date Palm in the Middle East". Journal of Agricultural and Marine Sciences. 3 (1). Sultan Qaboos University: 77. doi:10.24200/jams.vol3iss1pp77-83. eISSN 2410-1079. ISSN 2410-1060. S2CID 133994320.
  25. ^ European Commission. Directorate-General for Health Consumers (2011). The insect killing our palm trees : EU efforts to stop the Red Palm Weevil. Luxembourg: Publications Office of the European Union. p. 32. doi:10.2772/851. ISBN 978-92-79-21268-0.
  26. ^ "Red palm weevils can fly 50 kilometers in 24 hours". Phys.org. 2015-12-16. Retrieved 2021-02-15.
  27. ^ "Red Palm Weevil". Center for Invasive Species Research (CISR). Retrieved 2022-09-09.
  28. ^ "Rhynchophorus ferrugineus (red palm weevil)#tonaturalEnemies". Invasive Species Compendium (ISC). CABI (Centre for Agriculture and Bioscience International). 2020-12-11. Retrieved 2021-02-16.
  29. ^
    Soroker, Victoria; Harari, Ally; Faleiro, Jose Romeno (2015). "The Role of Semiochemicals in Date Pest Management". Sustainable Pest Management in Date Palm: Current Status and Emerging Challenges. Cham: Springer International Publishing. pp. 315–346. doi:10.1007/978-3-319-24397-9_11. ISBN 978-3-319-24395-5. S2CID 88366966.
    Dembilio, Óscar; Jaques, Josep A. (2015). "Biology and Management of Red Palm Weevil". Sustainable Pest Management in Date Palm: Current Status and Emerging Challenges. Cham: Springer International Publishing. pp. 13–36. doi:10.1007/978-3-319-24397-9_2. ISBN 978-3-319-24395-5. S2CID 88300895.
    These books cite this research.
    Al-Saoud, Ahmad Hussen (2013-09-01). "Effect of ethyl acetate and trap colour on weevil captures in red palm weevil Rhynchophorus ferrugineus (Coleoptera: Curculionidae) pheromone traps". International Journal of Tropical Insect Science. 33 (3): 202–206. Bibcode:2013IJTIS..33..202A. doi:10.1017/S1742758413000167. ISSN 1742-7584. S2CID 87703195.
  30. ^ El-Sufty, R.; Al-Awash, S.A.; Al Amiri, A.M.; Shahdad, A.S.; Al Bathra, A.H.; Musa, S.A. (2007). "Biological control of red palm weevil, Rhynchophorus ferrugineus (Col.: Curculionidae) by the entomopathogenic fungus Beauveria bassiana in United Arab Emirates". Acta Horticulturae (736): 399–404. doi:10.17660/ActaHortic.2007.736.36. ISSN 0567-7572.
  31. ^ El-Sufty, R.; Al-Awash, S.A.; Al Amiri, A.M.; Shahdad, A.S.; Al Bathra, A.H.; Musa, S.A. (2007). "Biological Control of Red Palm Weevil, Rhynchophorus Ferrugineus (Col.: Curculionidae) by the Entomopathogenic Fungus Beauveria Bassiana in United Arab Emirates". Acta Horticulturae (736): 399–404. doi:10.17660/ActaHortic.2007.736.36.
  32. ^ Hussein, Walid Barakat; Hussein, Mohamed Ahmed; Becker, Thomas (August 24–28, 2009). Application of The Signal Processing Technology in The Detection of Red Palm Weevil (PDF). 17th European Signal Processing Conference. Proceedings (EUSIPCO 2009). Vol. 17. Glasgow, Scotland (published 2009).
  33. ^ Friedman, Matti (2021-02-10). "Opinion | The New Alliance Shaping the Middle East Is Against a Tiny Bug". The New York Times. ISSN 0362-4331. Retrieved 2022-01-05.
  34. ^ a b c AlDosary, Naji; AlDobai, Shoki; Faleiro, Jose (2016). "Review on the Management of Red Palm Weevil Rhynchophorus ferrugineus Olivier in Date Palm Phoenix dactylifera L". Review Article. Emirates Journal of Food and Agriculture. 28 (1). Faculty of Food and Agriculture, United Arab Emirates University: 34–44. doi:10.9755/ejfa.2015-10-897. ISSN 2079-052X. S2CID 89447762.
  35. ^ a b "'Kinh dị' Đuông dừa, đặc sản khó xơi" (in Vietnamese). Vietnam Net. 7 March 2014. Retrieved 7 October 2016.
  36. ^ James, Trevor (August 3, 2017). INSANE Street Food Tour in Saigon, Vietnam. Event occurs at 11 minutes, 24 seconds. Archived from the original on 2021-12-15.
  37. ^ Köhler, Realm; Irias-Mata, Andrea; Ramandey, Euniche; Purwestri, Ratna; Biesalski, Hans Konrad (2020-09-01). "Nutrient composition of the Indonesian sago grub (Rhynchophorus bilineatus)". International Journal of Tropical Insect Science. 40 (3): 677–686. Bibcode:2020IJTIS..40..677K. doi:10.1007/s42690-020-00120-z. ISSN 1742-7592. S2CID 213784596.

Additional resources

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Wikispecies has information related to Rhynchophorus ferrugineus.
Wikimedia Commons has media related to Rhynchophorus ferrugineus.
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