Sunn pest

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A sunn pest is an insect belonging to a group representing several genera of the 'shield bug' (Scutelleridae) and 'stink bug' (Pentatomidae) Families, with the species Eurygaster integriceps being the most economically important. Sunn pests are found in parts of North Africa, throughout West Asia and many of the new independent states of Central Asia. [1] [2]

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The sunn pest is one of the most serious pests of wheat and barley in West Asia, where over $42 million (U.S.) is spent for its control. Yield loss from its damage has been estimated at 20-30% in barley and 50-90% in wheat. This insect damages these crops by feeding on leaves, stems and grains. During feeding they also inject chemicals that greatly reduce the baking quality of flour made from damaged wheat. If 2-3% of the grain is damaged, entire lots may be ruined because the flour will be unpalatable and the bread will not rise. [3] Heavy attack causes wheat stems to break before harvest.

Large areas of wheat sometimes remain unharvested because sunn pest damage is so severe. These insects also attack barley, though damage is usually low. Large outbreaks of sunn pests generally occur every 6 to 8 years and can potentially cause yield losses of tens of millions of dollars. [3]

Sunn pest management

Currently, there is not a pest management strategy to control the sunn pest on a national or global scale. However, there are a number of methods that farmers can utilize to help limit the damage caused by these insects.

  1. Monitor pest populations; sunn pest populations vary from year to year in response to climatic conditions. Pest populations should be monitored annually to determine if it is necessary to spray for the insect. Keeping records of population levels is beneficial.
  2. Plant early-maturing wheat varieties and harvest early; damage is less if wheat is harvested before sunn pest reach adulthood. Growing early-maturing varieties and establishing a regional uniform planting date minimizes damage. Early harvesting methods must be developed in relation to local production methods and weather conditions.
  3. Maintain shelter belts around wheat fields. Natural enemies reduce sunn pest populations and should be encouraged. Cereal crops should not be grown on marginal lands in the foothills. These areas should remain as uncultivated habitats where flowers and grow undisturbed, providing shelter and alternative food sources, which improve survival of these beneficial insects.
  4. Use chemical insecticides only if needed.

Selective insecticides should only be used when pest populations reach economically damaging levels. Applications should be made when adults move into cereal fields. Research has been ongoing for decades to develop and improve management of the sunn pest. In 1997, scientists from the International Center for Agricultural Research in the Dry Areas (ICARDA), the University of Vermont, and national agricultural researchers throughout the infested region began working together to develop a model sunn pest integrated management plan.

Sunn pest research

A cooperative program between the University of Vermont Entomology Research Laboratory and the International Center for Agricultural Research in the Dry Areas (ICARDA), in Aleppo, Syria was initiated in 1997. Several strains of entomopathogenic fungi have been isolated from insects in their over wintering sites in Turkey, Syria, Kazakhstan, Kyrgyzstan, Uzbekistan and Russia. In laboratory bioassays, they were tested against sunn pests, tarnished plant bug and western flower thrips. Several were highly pathogenic to all of these insects, and selected for further evaluation.

The next step in the development of these biological agents is to determine at what stage in the pests' life cycle fungi could best be used. Two possibilities are

  1. As they migrate to the fields in the early spring
  2. In their over wintering sites among the foothills surrounding the fields.

Six of the most promising isolates were tested in on-plant and in-litter bioassays in January 2000. Several of the tested isolates provided 80-100% mortality within 10 days. Though sunn pest mortality occurred more rapidly among the in-litter assays, by day 15 sunn pest mortality was equally high in the on-plant assays. These results demonstrate the great potential of fungi for sunn pest integrated pest management. It may be possible to use them both in over-wintering sites and on plants in the field. Plans are underway to conduct small-scale pilot tests to further evaluate their efficacy under field conditions. The compatibility of fungi with non-target organisms and chemical pesticides are also planned for the future.

Related Research Articles

Integrated pest management Approach for economic control of pests

Integrated pest management (IPM), also known as integrated pest control (IPC) is a broad-based approach that integrates practices for economic control of pests. IPM aims to suppress pest populations below the economic injury level (EIL). The UN's Food and Agriculture Organization defines IPM as "the careful consideration of all available pest control techniques and subsequent integration of appropriate measures that discourage the development of pest populations and keep pesticides and other interventions to levels that are economically justified and reduce or minimize risks to human health and the environment. IPM emphasizes the growth of a healthy crop with the least possible disruption to agro-ecosystems and encourages natural pest control mechanisms." Entomologists and ecologists have urged the adoption of IPM pest control since the 1970s. IPM allows for safer pest control.

Pentatomoidea Superfamily of true bugs

The Pentatomoidea are a superfamily of insects in the Heteroptera suborder of the Hemiptera order. As Hemiptera, they share a common arrangement of sucking mouthparts. The roughly 7000 species under Pentatomoidea are divided into 21 families. Among these are the shield bugs, giant shield bugs, burrower bugs, and stink bugs.

Scutelleridae Family of insects

Scutelleridae is a family of true bugs. They are commonly known as jewel bugs or metallic shield bugs due to their often brilliant coloration. They are also known as shield-backed bugs due to the enlargement of the thoracic scutellum into a continuous shield over the abdomen and wings. This latter characteristic distinguishes them from most other families within Heteroptera, and may lead to misidentification as a beetle rather than a bug. These insects feed on plant juices from a variety of different species, including some commercial crops. Closely related to stink bugs, they may also produce an offensive odour when disturbed. There are around 450 species worldwide.

Biopesticides, a contraction of 'biological pesticides', include several types of pest management intervention: through predatory, parasitic, or chemical relationships. The term has been associated historically with biological pest control – and by implication, the manipulation of living organisms. Regulatory positions can be influenced by public perceptions, thus:

In agriculture and gardening, a beneficial organism is any organism that benefits the growing process, including insects, arachnids, other animals, plants, bacteria, fungi, viruses, and nematodes. Benefits include pest control, pollination, and maintenance of soil health. The opposite of beneficial organisms are pests, which are organisms deemed detrimental to the growing process. There are many different types of beneficial organisms as well as beneficial microorganisms. Also, microorganisms have things like salt and sugar in them. Beneficial organisms include but are not limited to: Birds, Bears, Nematodes, Insects, Arachnids, and fungi. The ways that birds and bears are considered beneficial is mainly because they consume seeds from plant and spread them through feces. Birds also prey on certain insects that eat plants and hinder them from growing these insects are known as non beneficial organisms. Nematodes are considered beneficial because they will help compost and provide nutrients for the soil the plants are growing in. Insects and arachnids help the growing process because they prey on non beneficial organisms that consume plants for food. Fungi help the growing process by using long threads of mycelium that can reach very long distances away from the tree or plant and bring water and nutrients back to the tree or plant roots.

Entomopathogenic fungus

An entomopathogenic fungus is a fungus that can act as a parasite of insects and kills or seriously disables them.

Forest integrated pest management or Forest IPM is the practice of monitoring and managing pest and environmental information with pest control methods to prevent pest damage to forests and forest habitats by the most economical means. Forest IPM practices vary from region to region and particularly by state, according to the habitat and forests present. Forest integrated pest management or Forest IPM combines cultural, biological and chemical technologies to reduce pest damage to levels below those that of economic damage. Forest IPM is utilized for the whole life of the tree, from site prep to harvest. An IPM treatment is utilized before the cost of the treatment is equal to the reduction in crop value due to past injury, which is called the economic injury level. Forest integrated pest management has a strong emphasis on intensive forest management.

Tarnished plant bug Species of true bug

The tarnished plant bug (TPB), Lygus lineolaris, is a species of plant-feeding insect in the family Miridae. It has piercing-sucking mouthparts and has become a serious pest on small fruits and vegetables in North America. It is considered a highly polyphagous species and feeds on over half of all commercially grown crop plants, but favors cotton, alfalfa, beans, stone fruits, and conifer seedlings. A study done in southwestern Quebec, Canada has investigated the presence of L. lineolaris in a commercial vineyard. This study also indicated that weeds that grow from cultivation of crops serve as an important food source for L. lineolaris. This insect can be found across North America, from northern Canada to southern Mexico. Adults grow up to 6.5 mm in length, and are brown with accents of yellow, orange or red, with a light-colored "V" on the back (dorsal).

Brown marmorated stink bug Species of insect

The brown marmorated stink bug is an insect in the family Pentatomidae, native to China, Japan, and other Asian regions. In September 1998 it was collected in Allentown, Pennsylvania, where it is believed to have been accidentally introduced. The nymphs and adults of the brown marmorated stink bug feed on over 100 species of plants, including many agricultural crops, and by 2010–11 had become a season-long pest in orchards in the Eastern United States. In 2010, in the Mid-Atlantic United States, $37 million in apple crops were lost, and some stone fruit growers lost more than 90% of their crops. It is now established in many parts of North America, and has recently become established in Europe and South America.

Insecticidal soap is used to control many plant insect pests. Soap has been used for more than 200 years as an insect control. Because insecticidal soap works on direct contact with pests via the disruption of cell membranes when the insect is penetrated with fatty acids, the insect's cells leak their contents causing the insect to dehydrate and die. Insecticidal soap is sprayed on plants until the entire plant is saturated because the insecticidal properties of the soap occurs when the solution is wet. Soaps have a low mammalian toxicity and are therefore considered safe to be used around children and pets, and may be used in organic farming.

<i>Leptoglossus zonatus</i> Species of true bug

Leptoglossus zonatus is a species of leaf-footed bug, a type of true bugs. It is found throughout much of South America, Central America, Mexico, and the southwestern United States. The bug is two centimeters in length, gray in color, with a zigzagging whitish band across its back and two distinctive yellowish spots on its anterior pronotum, the identifying characteristic for the species.

<i>Rhyzopertha</i> Genus of beetles

Rhyzopertha is a monotypic genus of beetles in the family Bostrichidae, the false powderpost beetles. The sole species, Rhyzopertha dominica, is known commonly as the lesser grain borer, American wheat weevil, Australian wheat weevil, and stored grain borer. It is a beetle commonly found within store bought products and pest of stored cereal grains located worldwide. It is also a major pest of peanuts. The first documentation of wheat infestation by R. dominica was observed in Australia. R. dominica are usually reddish brown to dark brown in coloration, vary in sizes, elongated and cylindrical.

<i>Stenotus binotatus</i> Species of true bug

Stenotus binotatus is a species of plant bug, originally from Europe, but now also established across North America and New Zealand. It is 6–7 mm (0.24–0.28 in) long, yellowish, with darker markings on the pronotum and forewings. It feeds on various grasses, and can be a pest of crops such as wheat.

<i>Bagrada hilaris</i> Species of true bug

Bagrada hilaris is a species of shield bug known by the common names bagrada bug and painted bug (See a short video at YouTube). It could be mistaken for or erroneously referred to as harlequin bug. It is native to Africa. It is known elsewhere as an introduced species, including California and Arizona, where it was first reported in 2008. It is a major pest insect of Brassica oleracea crops, and related crucifers such as turnips, rape, and mustard. The adult and nymph of the species suck sap from the leaves of the plants, causing wilting, yellowing, and stunting of growth. Besides crucifers, the bugs are known on papaya, sorghum, maize, potato, cotton, caper, pearl millet, and some legumes. Large numbers of the bug congregate on the plants and cause extensive damage.

<i>Eurygaster integriceps</i> Species of true bug

Eurygaster integriceps is a species of shield bug in the family Scutelleridae, commonly known as the sunn pest or corn bug. It is native to much of northern Africa, the Balkans and western and central Asia. It is a major pest of cereal crops especially wheat, barley and oats.

<i>Coccus viridis</i> Species of true bug

Coccus viridis is a soft scale insect in the family Coccidae with a wide host range. It is commonly known as green scale or sometimes coffee green scale because it is a major pest of coffee crops throughout the world.

<i>Calliphara nobilis</i> Species of jewel bug

Calliphara nobilis is a species of jewel bug found in Asia. Like all species of jewel bugs, it is phytophagous, feeding on the leaves, fruit and seeds of its host plants. This insect is notable for its multiple defense mechanisms: it is highly mobile and swarms disperse with a loud buzz when disturbed; it is aposematically colored, which serves as a warning to any would-be predators that it is unpalatable; and it possesses a robust chemical defense mechanism: it can secrete an irritating and toxic fluid from a pair of metathoracic scent glands when threatened.

<i>Oebalus pugnax</i> Species of true bug

Oebalus pugnax, the rice stink bug, is a flying insect in the shield bug family Pentatomidae native to North America that has become a major agricultural pest in the Southern United States. It has been a known pest since at least the time of Johan Christian Fabricius, who described the species in 1775.

<i>Bruchus rufimanus</i> Species of beetle

Bruchus rufimanus, commonly known as the broadbean weevil, broadbean beetle, or broadbean seed beetle is a leaf beetle which inhabits crops and fields, as well as some homes. It is a pest of faba beans. The adult beetles feed on pollen, while their larvae tunnel in seeds destroying crops and moving on to new ones once they dry out. The adult beetle, being one of the biggest of its genus, ranges from 3 to 5 mm in length.

<i>Creontiades dilutus</i> Species of true bug

Creontiades dilutus is commonly known as the green mirid, it is a member of the bug family Miridae. This insect is considered a "generalist" feeding on over 100 plant species, and is also a major economic pest on several important agricultural crops.

References

  1. Carl W . Schaefer , John D . Lattin , & M . Javahery (2001). "Shield Bugs (Scutelleridae)". In Carl W . Schaefer & Antonio Ricardo Panizzi (ed.). Heteroptera of Economic Importance. CRC Press. pp. 475–503. doi:10.1201/9781420041859.ch14. ISBN   978-1-4200-4185-9.CS1 maint: multiple names: authors list (link)
  2. Randall T. Schuh & James Alexander Slater (1995). True bugs of the world (Hemiptera:Heteroptera): classification and natural history. Cornell University Press. p. 36. ISBN   978-0-8014-2066-5.
  3. 1 2 University of Vermont