Brown marmorated stink bug
|Brown marmorated stink bug|
The brown marmorated stink bug is an agricultural pest and by 2010–11 had become a season-long pest in U.S. orchards. It is now established in many parts of North America and has recently established itself in Europe and South America. It was accidentally introduced into the United States, with the first specimen being collected in September 1998.
The stink glands are located on the underside of the thorax, between the first and second pair of legs, and on the dorsal surface of the abdomen.
The adults are approximately 1.7 cm (0.67 in) long and about as wide, forming the shield shape characteristic of other stink bugs. They are various shades of brown on both the top and undersides, with gray, off-white, black, copper, and bluish markings.
The term "marmorated" means variegated or veined like marble. Markings unique to this species include alternating light bands on the antennae and alternating dark bands on the thin outer edge of the abdomen. The legs are brown with faint white mottling or banding.
The odor from the stink bug is due to trans-2-decenal and trans-2-octenal. The smell has been characterized as a "pungent odor that smells like coriander." The stink bug's ability to emit an odor through holes in its abdomen is a defense mechanism meant to prevent it from being eaten by birds and lizards. However, simply handling the bug, injuring it, or attempting to move it can trigger it to release the odor.
During courtship, the male emits pheromones and vibrational signals to communicate with a female, which replies with her own vibrational signals, as in all stink bugs. The insects use the signals to recognize and locate each other. Vibrational signals of this species are noted for their low frequency, and one male signal type is much longer than any other previously described signals in stink bugs, although the significance of this is not yet clear.
The brown marmorated stink bug is a sucking insect (like all Hemiptera or "true bugs") that uses its proboscis to pierce the host plant to feed. This feeding results, in part, in the formation of dimpled or necrotic areas on the outer surface of fruits, leaf stippling, seed loss, and possible transmission of plant pathogens. It is an agricultural pest that can cause widespread damage to fruit and vegetable crops. In Japan, it is a pest to soybean and fruit crops. In the U.S., the brown marmorated stink bug feeds, beginning in late May or early June, on a wide range of fruits, vegetables, and other host plants including peaches, apples, green beans, soybeans, cherries, raspberries, and pears.
In North AmericaEdit
The brown marmorated stink bug was accidentally introduced into the United States from China or Japan. It is believed to have hitched a ride as a stowaway in packing crates or on various types of machinery. The first documented specimen was collected in Allentown, Pennsylvania, in September 1998. Several Muhlenberg College students were reported to have seen these bugs as early as August of that same year. Between 2001 and 2010, 54 sightings were reported of these bugs at shipping ports in the United States. However, stink bugs are not listed as reportable, meaning that they do not need to be reported and no action is required to remove the insect. This allowed the insect to enter the United States relatively easily, as they are able to survive long periods of time in hot or cold conditions.
Other reports have the brown marmorated stink bug documented as early as 2000 in New Jersey from a blacklight trap run by the Rutgers Cooperative Extension Vegetable Integrated Pest Management program in Milford, New Jersey.
In 2002, in New Jersey, it was found on plant material in Stewartsville, and was collected from blacklight traps in Phillipsburg and Little York. It was quickly documented and established in many counties in Pennsylvania, New Jersey, Delaware, Connecticut, and New York on the eastern coast of the United States.
By 2009, this agricultural pest had reached Maryland, West Virginia, Virginia, Tennessee, North Carolina, Kentucky, Ohio, Illinois, and Oregon. In 2010 this pest was found in additional states including Indiana, Michigan, Minnesota, and other states.
As of 2010, 17 states had been categorized as having established populations, and several other states along the eastern half of the United States were reported as having more than normal numbers of stink bugs. Stink bug populations rise because the climate in the United States is ideal for their reproduction. In optimal conditions, an adult stink bug can develop within 35 to 45 days after hatching. Female stink bugs are capable of laying 400 eggs in their lifetimes. The bug is also capable of producing at least one successful generation per year in all areas of the United States, no matter the climate. In warmer climates, multiple generations can occur annually, which can range from two generations in states such as Virginia to six generations in California, Arizona, Florida, Louisiana, Georgia, and Texas.
The addition of two more generations allowed the population to explode, leading to the establishment of several other populations in neighboring states. Currently, no environmental limiting factors are apparently slowing their distribution across North America. They also are extremely mobile insects, capable of moving from host to host without causing disruption in their reproductive processes. Currently, populations are estimated to continue to grow and spread to other states and provinces, especially during unusual periods of warm weather.
The brown marmorated stink bug is a serious agricultural pest that has been readily causing damage to crops across the Eastern United States. They feed on a wide array of plants including apples, apricots, Asian pears, cherries, corn, grapes, lima beans, peaches, peppers, tomatoes, and soybeans. This makes them extremely versatile, as they do not require a specific plant on which to feed. To obtain their food, stink bugs use their stylets to pierce the plant tissue to extract the plant fluids. In doing so, the plant loses necessary fluids, which can lead to deformation of seeds, destruction of seeds, destruction of fruiting structures, delayed plant maturation, and increased vulnerability to harmful pathogens. While harvesting the plant's juices, the stink bug injects saliva into the plant, creating a dimpling of the fruit's surface and rotting of the material underneath.
The most common signs of stink bug damage are pitting and scarring of the fruit, leaf destruction, and a mealy texture to the harvested fruits and vegetables. In most cases, the signs of stink bug damage makes the plant unsuitable for sale in the market, as the insides are usually rotten. In field crops such as corn and soybeans, the damage may not be as evident as the damage seen in fruit plants. When stink bugs feed on corn, they go through the husk before eating the kernels, hiding the damage until the husks are removed during harvesting. The same damage is seen in soybeans, as the stink bug goes through the seed pods to acquire the juices of the seeds. One visual cue of stink-bug damage to soybean crops is the "stay green" effect, where damaged soybean plants stay green late into season, while other plants in the field die off normally. One can usually tell that a field of crops is infected because stink bugs are known for the "edge effect", in which they tend to infest crops 30–40 ft from the edge of the field. Farmers who suspect having stink bugs in their crops should contact their respective departments of agriculture for information on how to manage the infestation and possible ways to prevent future incidences.
Control of stink bugs is a priority of the U.S. Department of Agriculture, which has developed an artificial pheromone which can be used to bait traps. Because the bugs insert their probosces below the surface of fruit and then feed, some insecticides are ineffective; in addition, the bugs are mobile, and a new population may fly in after the resident population has been killed, making permanent removal nearly impossible. In the case of soybean infestations, spraying only the perimeter of a field may be the most effective method of preventing stinkbugs from damaging the crops. However, even this method is limited, as new populations move back into the area, or the existing population simply moves to unaffected areas. Evidence also shows that stink bugs are developing a resistance to pyrethroid insecticides, a common chemical used to combat infestations. Other insecticides currently in field trials that are showing promising results are oxamyl (96% mortality rate) and moribund (67% mortality rate). Many other commonly used insecticides are merely used to keep the insects out of fields, rather than actually killing them. The most successful method of protecting apples found thus far is the use of kaolin clay. As of 2012[update], native predators such as wasps and birds were showing increased signs of feeding on the bugs as they adapt to the new food source. Managing this pest species is challenging because few effective pesticides are labeled for use against them.
Similarity in appearance to native speciesEdit
Easily confused with Brochymena and Euschistus, the best identification for adults is the white band on the antennae. It is similar in appearance to other native species of shield bug, including Acrosternum, Euschistus, and Podisus, except that several of the abdominal segments protrude from beneath the wings and are alternatively banded with black and white (visible along the edge of the bug even when wings are folded) and a white stripe or band on the next to last (fourth) antennal segment. The adult rice stink bug (Oebalus pugnax) is distinguishable from the brown marmorated stink bug by noting the straw color, the smaller size, and the elongated shape of the rice stink bug.
The brown marmorated stink bug was likely first introduced to Europe during the repair work of the Chinese Garden in Zürich, Switzerland in the winter of 1998. The stink bug has been traced back to have traveled with roof tiles that were imported from Beijing, China. The bug has since spread rapidly through Europe. The first sighting in southern Germany was made in Konstanz in 2011. In Italy the first specimens were found in Modena in 2012 and afterwards in South Tirol in 2016. The bug has also been sighted in Vienna, Austria, with increasing reports after 2016. The Italian region of Friuli-Venezia Giulia announced from 2017 to distribute 3,5 million euro to offset the costs of the lost crops of the fruit farmers until the year 2020.
Spread from Russia to GeorgiaEdit
The stink bug was traced to have been introduced to the Greater Caucasus area during the construction works of the 2014 Winter Olympics in Sochi, Russia, where it was most likely imported with decorative building elements brought from Italy. The stink bug has since spread to Georgia, where it continues to cause major damage to the local crops. During the years 2016-2018 the bug was estimated to have destroyed one third of Georgia's hazelnut harvest, with yearly damages of up to 60 million euro. Georgia is the fifth largest producer of hazelnut in the world, with yearly production valued at 179,5 million USD in 2016. The Georgian government together with the United States Agency for International Development (USAID) have allocated 4,8 million USD to help combat the spread of the brown marmorated stink bug in Georgia, but so far the efforts have been criticized as being insufficient.
In China, Trissolcus japonicus, a parasitoid wasp species in the family Scelionidae, is a primary predator. This species is not currently present in the U.S., but is undergoing study for possible introduction. The major problem with this idea is the possibility that T. japonicus will also become an invasive species with no native predators. Before introducing the Chinese wasp, scientists are trying to find natural predators of the stink bug already present in the United States. To do so, they have studied other species of parasitoid wasps native to the United States. They found that several other species of the parasitoid wasps attacked stink bug eggs in Virginia soybean fields. Researchers have also experimented with different spider species, as well as the wheel bug. Several spider species attacked both the eggs and adult stink bugs. Pill bugs eat stinkbug eggs. The wheel bug, however, was the most voracious predator and attacked the eggs and adults more consistently.
In houses and structuresEdit
The brown marmorated stink bug is more likely to invade homes in the fall than others in the family. The bug survives the winter as an adult by entering houses and structures when autumn evenings become colder, often in the thousands. In one home, more than 26,000 stinkbugs were found overwintering. Adults can live from several months to a year. They enter under siding, into soffits, around window and door frames, chimneys, or any space which has openings big enough to fit through. Once inside the house, they go into a state of hibernation. They wait for winter to pass, but often the warmth inside the house causes them to become active, and they may fly clumsily around light fixtures. Two important vectors of this pest are the landscape ornamentals tree of heaven and princess tree.
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|Wikimedia Commons has media related to Halyomorpha halys.|
- Wikibooks: Halyomorpha halys
- Stink bug fact sheet (Penn State Fact Sheet on the brown marmorated stink bug)
- Brown marmorated stink bug on the UF/IFAS Featured Creatures Web site
- Brown marmorated stink bug in Oregon, Oregon State University
- Brown marmorated stink bug at Invasive.org (a joint project of The Bugwood Network, USDA Forest Service and USDA APHIS PPQ)
- Species Profile- Brown Marmorated Stink Bug (Halyomorpha halys), National Invasive Species Information Center, United States National Agricultural Library. (lists general information and resources for brown marmorated stink bug)
- Brown marmorated stink bug: protection and response (information and fact sheet from the New Zealand Ministry for Primary Industries)
- StopBMSB.org — information about the management of brown marmorated stink bug in U.S. specialty crops, supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, Specialty Crop Research Initiative.