Ceratitis capitata
Encyclopedia
Ceratitis capitata, the Mediterranean fruit fly, or medfly for short, is a species of fruit fly
capable of causing extensive damage to a wide range of fruit
crops. It is native to the Mediterranean area
, but has spread invasively
to many parts of the world, including Australasia
and North
and South America
.
under the skins of fruit, particularly where the skin is already broken. The eggs hatch within three days, and the larvae develop inside the fruit. The adults have a limited ability to disperse, but the global fruit trade can transport infected fruit over thousands of miles.
, C. capitata has invaded four states (Hawaii
, California
, Texas
and Florida
), but has been eradicated from all but Hawaii
. The medfly has been spotted in California
as recently as mid September of 2009. It has also been eradicated from New Zealand
and Chile
.
has allowed the species to be eradicated from several areas.
In 1981, California Governor
Jerry Brown
, who had established a reputation as a strong environmentalist
, was confronted with a serious medfly infestation in the San Francisco Bay Area
. He was advised by the state's agricultural industry, and the US Department of Agriculture's Animal and Plant Health Inspection service (APHIS), to authorize airborne spraying of the region. Initially, in accordance with his environmental protection stance, he chose to authorize ground-level spraying only. Unfortunately, the infestation spread as the medfly reproductive cycle out-paced the spraying. After more than a month, millions of dollars of crops had been destroyed and billions of dollars more were threatened. Governor Brown then authorized a massive response to the infestation. Fleets of helicopters sprayed malathion
at night, and the California National Guard
set up highway checkpoints and collected many tons of local fruit; in the final stage of the campaign, entomologists
released millions of sterile male medflies in an attempt to disrupt the insects' reproductive cycle.
Ultimately the infestation was eradicated, but both the Governor's delay and the scale of the action has remained controversial ever since. Some people claimed that malathion was toxic to humans, as well as insects. In response to such concerns, Brown's chief of staff, B. T. Collins
, staged a news conference during which he publicly drank a small glass of malathion. Many people complained that, while the malathion may not have been very toxic to humans, the aerosol spray containing it was corrosive to car paint.
During the week of September 9, 2007, adult flies and their larvae were found in Dixon, California
. The California Department of Food and Agriculture
(CDFA) and cooperating county and federal agricultural officials started eradication and quarantine efforts in the area. Eradication was declared on August 8, 2008, when no "wild" (i.e. non-sterile) medflies were detected for three generations.
On November 14, 2008, four adult flies were found in El Cajon, California
. The San Diego County Agricultural Commission implemented a treatment plan, including distributing millions of sterile male flies, local produce quarantines, and ground spraying with organic pesticides.
Tephritidae
Tephritidae is one of two fly families referred to as "fruit flies", the other family being Drosophilidae. Tephritidae does not include the biological model organisms of the genus Drosophila , which is often called the "common fruit fly". There are nearly 5,000 described species of tephritid...
capable of causing extensive damage to a wide range of fruit
Fruit
In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...
crops. It is native to the Mediterranean area
Mediterranean Basin
In biogeography, the Mediterranean Basin refers to the lands around the Mediterranean Sea that have a Mediterranean climate, with mild, rainy winters and hot, dry summers, which supports characteristic Mediterranean forests, woodlands, and scrub vegetation...
, but has spread invasively
Invasive species
"Invasive species", or invasive exotics, is a nomenclature term and categorization phrase used for flora and fauna, and for specific restoration-preservation processes in native habitats, with several definitions....
to many parts of the world, including Australasia
Australasia
Australasia is a region of Oceania comprising Australia, New Zealand, the island of New Guinea, and neighbouring islands in the Pacific Ocean. The term was coined by Charles de Brosses in Histoire des navigations aux terres australes...
and North
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...
and South America
South America
South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...
.
Life cycle
Adult medflies lay their eggsEgg (biology)
An egg is an organic vessel in which an embryo first begins to develop. In most birds, reptiles, insects, molluscs, fish, and monotremes, an egg is the zygote, resulting from fertilization of the ovum, which is expelled from the body and permitted to develop outside the body until the developing...
under the skins of fruit, particularly where the skin is already broken. The eggs hatch within three days, and the larvae develop inside the fruit. The adults have a limited ability to disperse, but the global fruit trade can transport infected fruit over thousands of miles.
Invasions
In the United StatesUnited States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
, C. capitata has invaded four states (Hawaii
Hawaii
Hawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...
, California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
, Texas
Texas
Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
and Florida
Florida
Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...
), but has been eradicated from all but Hawaii
Hawaii
Hawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...
. The medfly has been spotted in California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
as recently as mid September of 2009. It has also been eradicated from New Zealand
New Zealand
New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...
and Chile
Chile
Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...
.
California medfly crisis
Much research has been dedicated to means of controlling the medfly. In particular, use of the sterile insect techniqueSterile insect technique
The sterile insect technique is a method of biological control, whereby overwhelming numbers of sterile insects are released. The released insects are normally male as it is the female that causes the damage, usually by laying eggs in the crop, or, in the case of mosquitoes, taking a bloodmeal from...
has allowed the species to be eradicated from several areas.
In 1981, California Governor
Governor of California
The Governor of California is the chief executive of the California state government, whose responsibilities include making annual State of the State addresses to the California State Legislature, submitting the budget, and ensuring that state laws are enforced...
Jerry Brown
Jerry Brown
Edmund Gerald "Jerry" Brown, Jr. is an American politician. Brown served as the 34th Governor of California , and is currently serving as the 39th California Governor...
, who had established a reputation as a strong environmentalist
Environmentalism
Environmentalism is a broad philosophy, ideology and social movement regarding concerns for environmental conservation and improvement of the health of the environment, particularly as the measure for this health seeks to incorporate the concerns of non-human elements...
, was confronted with a serious medfly infestation in the San Francisco Bay Area
San Francisco Bay Area
The San Francisco Bay Area, commonly known as the Bay Area, is a populated region that surrounds the San Francisco and San Pablo estuaries in Northern California. The region encompasses metropolitan areas of San Francisco, Oakland, and San Jose, along with smaller urban and rural areas...
. He was advised by the state's agricultural industry, and the US Department of Agriculture's Animal and Plant Health Inspection service (APHIS), to authorize airborne spraying of the region. Initially, in accordance with his environmental protection stance, he chose to authorize ground-level spraying only. Unfortunately, the infestation spread as the medfly reproductive cycle out-paced the spraying. After more than a month, millions of dollars of crops had been destroyed and billions of dollars more were threatened. Governor Brown then authorized a massive response to the infestation. Fleets of helicopters sprayed malathion
Malathion
Malathion is an organophosphate parasympathomimetic which binds irreversibly to cholinesterase. Malathion is an insecticide of relatively low human toxicity, however one recent study has shown that children with higher levels of organophosphate pesticide metabolites in their urine are more likely...
at night, and the California National Guard
California National Guard
The California National Guard is the component of the United States National Guard in the U.S. state of California. It comprises both Army and Air National Guard components and is the largest national guard force in the United States with a total authorized strength of 22,900 soldiers and airmen...
set up highway checkpoints and collected many tons of local fruit; in the final stage of the campaign, entomologists
Entomology
Entomology is the scientific study of insects, a branch of arthropodology...
released millions of sterile male medflies in an attempt to disrupt the insects' reproductive cycle.
Ultimately the infestation was eradicated, but both the Governor's delay and the scale of the action has remained controversial ever since. Some people claimed that malathion was toxic to humans, as well as insects. In response to such concerns, Brown's chief of staff, B. T. Collins
B. T. Collins
Brien Thomas "B. T." Collins was an American politician from California and a member of the Republican party.-Early years:...
, staged a news conference during which he publicly drank a small glass of malathion. Many people complained that, while the malathion may not have been very toxic to humans, the aerosol spray containing it was corrosive to car paint.
During the week of September 9, 2007, adult flies and their larvae were found in Dixon, California
Dixon, California
Dixon is a city in northern Solano County, California, United States, located from the state capital, Sacramento. The population was 18,351 at the 2010 census. Other nearby cities include Vacaville, Winters and Davis....
. The California Department of Food and Agriculture
California Department of Food and Agriculture
The California Department of Food and Agriculture , is a cabinet-level agency in the government of California. Established in 1919 by the California State Legislature and signed into law by Governor William Stephens, the Department of Food and Agriculture is responsible for ensuring the state's...
(CDFA) and cooperating county and federal agricultural officials started eradication and quarantine efforts in the area. Eradication was declared on August 8, 2008, when no "wild" (i.e. non-sterile) medflies were detected for three generations.
On November 14, 2008, four adult flies were found in El Cajon, California
El Cajon, California
-History:El Cajon is located on the Rancho El Cajon Mexican land grant made in 1845 to María Antonia Estudillo, wife of Miguel Pedrorena. In 1876 Amaziah Lord Knox , a New Englander who had recently moved to California, established a hotel there to serve the growing number of people traveling...
. The San Diego County Agricultural Commission implemented a treatment plan, including distributing millions of sterile male flies, local produce quarantines, and ground spraying with organic pesticides.
Australia
In 2011, Japan banned imports of blueberries from Australia, because of "concerns they might be contaminated with Mediterranean fruit fly".External links
- The 1981 California Medfly Panic
- CISR Summary on Mediterranean Fruit Fly
- Species Profile - Mediterranean Fruit Fly (Ceratitis capitata), National Invasive Species Information Center, United States National Agricultural LibraryUnited States National Agricultural LibraryThe United States National Agricultural Library is one of the world's largest agricultural research libraries, and serves as a National Library of the United States and as the library of the United States Department of Agriculture...
. Lists general information and resources for Mediterranean fruit fly.