The major workers are larger and have oversized, mostly unsculptured heads without antennal scrobes. Score: – Low (1) does not have high reproductive or dispersal potential. This sap is a favorite food of the big-headed ant, Pheidole megacephala. An âAâ-rating is justified. If this occurs, it may complicate control of ACP by contact insecticides. Pheidole fervens recruits strongly to baits and food resources and forms long and busy foraging trails. (1995) A new general catalogue of the ants of the world. Score: A. 1993. The bigheaded ant (BHA), Pheidole megacephala(Fabricius), is a very successful invasive species that is sometimes considered a danger to native ants and has been nominated as among 100 of the "World's Worst" invaders (Hoffman 2006). ); Wheeler, G.C. Pheidole are a seed harvesting ant. 1) Climate/Host Interaction: Pheidole megacephala tends to favor cool areas with high humidity3. The majors only grind them up when food is needed. Pitfall trapping over a 9âmonth period resulted â¦ Adult ants don't eat much at all and can go months without food. 4) Economic Impact: Pheidole megacephala is likely to injure agriculturally important animals when it tends honeydew producing insects in agricultural systems. (for an example of an unswollen postpetiole, see P. fervens). It lives in a symbiotic relationship with the aphid, herding it like cattle, milking it â¦ The major workers are the easier subcaste to differentiate. Pheidole megacephala receives a High(3) in this category. Palms Nurs 2 Coconut scale Aspidiotus destructor Cut foliage Quar 4 Coffee bean weevil Formica megacephala Fabricius, 1793: 361 (s.) no locality given. Score: – Low (1) Not likely to establish in California; or likely to establish in very limited areas. It is possible that argentine ant may be able to outcompete bigheaded ant under some environmental conditions. If bigheaded ant were to both disrupt biological control of ACP by Tamarixia radiata and build shelters that protect ACP from contact insecticides, this may trigger additional management changes to organic citrus production in California. – Not established (0) Pest never detected in California, or known only from incursions. In a baiting study, fish and lepidopteran larvae were preferred to sucrose or honey solutions ( â¦ The presence of these ants as hitchhikers on a wide variety of commodities may trigger disruptions to California exports. Evaluate the economic impact of the pest to California using the criteria below. Official Control: Pheidole megacephala is listed as a quarantine pest by French Polynesia, Japan, and the Republic of Korea14. For example, they are well known to displace native ant fauna13. It is a serious threat to biodiversity through the displacement of native invertebrate fauna and is a pest of agriculture as it harvests seeds and harbours phytophagous insects that reduce crop productivity. Pheidole megacephala are also known to chew on irrigation and â¦ The colony of bigheaded ants, otherwise known by their scientific name, Pheidole megacephala, was recently discovered in the Costa Mesa neighborhood of â¦ C. The pest could trigger the loss of markets (includes quarantines). They develop very fast and therefore require relatively much and frequently the right nutrition. https://pcit.aphis.usda.gov/pcit/. They store seeds, sometimes filling entire rooms with seeds they've collected. Bolton, B. Colonies have multiple queens and each queen lays up to 292 eggs each month2. Pheidole megacephala uses mass recruitment to exploit food sources. Bigheaded ants nest in colonies underground. Bigheaded ant spreads relatively slowly naturally, but colonies in potted plants can be transported long distances rapidly. 5) Environmental Impact: Pheidole megacephala has the potential to cause massive, long-term alterations to natural communities and large-scale changes ecosystem processes. In experiments they have been shown to greatly reduce the success of biological control with Tamarixia radiata9. | Photographer: Utah State University, Jewel distaff thistle (photo by Steve Hurst, hosted by the USDA-NRCS PLANTS Database), Canadian wood-nettle (Laportea canadensis) | By Raffi Kojian (http://Gardenology.org) [CC BY-SA 3.0], via Wikimedia Commons, myrtle spurge | Euphorbia myrsinites L | Photographer: Steve Dewey, orange hawkweed | Hieracium aurantiacum L. | Photographer: Becca MacDonald, ragweed parthenium | Parthenium hysterophorus L. | Photographer: Charles T. Bryson, Senegal Tea Plant | Photographer: Robert VidÃ©ki, Phoradendron serotinum Â©2011 Jorg & Mimi Fleige, Slender Russian Thistle (Salsola collina) Pallas, Post Entry Distribution and Survey Information, http://entnemdept.ufl.edu/creatures/urban/ants/bigheaded_ant.htm, http://www.lrm.nt.gov.au/__data/assets/pdf_file/0018/11268/BigHAnt_Fact-Sheet.pdf, http://esa.publisher.ingentaconnect.com/search/article?option1=tka&value1=Interference+of+Pheidole+megacephala&operator9=AND&option9=publications&value9=esa&sortDescending=true&sortField=default&pageSize=10&index=1, http://esa.publisher.ingentaconnect.com/search/article?option1=tka&value1=Parallel+ridge+barrier+to+control&operator9=AND&option9=publications&value9=esa&sortDescending=true&sortField=default&pageSize=10&index=1, http://esa.publisher.ingentaconnect.com/search/article?option1=tka&value1=Predation+on+Liothrips+urichi&operator9=AND&option9=publications&value9=esa&sortDescending=true&sortField=default&pageSize=10&index=1, http://esa.publisher.ingentaconnect.com/search/article?option1=tka&value1=Relationship+between+community+structure&operator9=AND&option9=publications&value9=esa&sortDescending=true&sortField=default&pageSize=10&index=4, http://esa.publisher.ingentaconnect.com/search/article?option1=tka&value1=Effect+of+two+ant+species&operator9=AND&option9=publications&value9=esa&sortDescending=true&sortField=default&pageSize=10&index=4, http://swfrec.ifas.ufl.edu/hlb/database/pdf/21_Navarrete_13.pdf, http://www.bioone.org/doi/abs/10.5733/afin.052.0210?journalCode=afin, http://esa.publisher.ingentaconnect.com/search/article?option1=tka&value1=Effects+of+Pheidole+megacephala+%28+Hymenoptera%3a+Formicidae+%29+on+survival+and+dispersal+of+Dysmicoccus+neobrevipes&operator9=AND&option9=publications&value9=esa&sortDescending=true&sortField=default&pageSize=10&index=1, http://www.issg.org/database/species/reference_files/phemeg/hoffmann1999.pdf, http://onlinelibrary.wiley.com/doi/10.1046/j.1442-9993.2000.01021.x/abstract?deniedAccessCustomisedMessage=&userIsAuthenticated=false, Pest Ratings and Mitigating Actions, Section 3162 (PDF), Pest Rating Proposal Form (Word Document), Common Names of Insects and Related Organisms, The Jepson eflora: Most recent manual of California plants with up-to-date names, CalWeedMapper: Maps showing distribution and status of California weeds, Calflora: Localities of California plants, including weeds, The Consortium of California Herbaria: Information and interactive mapping of vouchered California plant occurrences, Gallery of Pests | Global Invasive Species Team – The Nature Conservancy. 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