Valanga nigricornis

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Javanese grasshopper
Malaysian Locust (Valanga nigricornis) (23220865943).jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Orthoptera
Suborder: Caelifera
Family: Acrididae
Subfamily: Cyrtacanthacridinae
Tribe: Cyrtacanthacridini
Genus: Valanga
Species:
V. nigricornis
Binomial name
Valanga nigricornis
(Burmeister, 1838) [2]

Valanga nigricornis, [3] the Javanese grasshopper (also known as the Javanese bird grasshopper [1] ), is a species of grasshopper in the subfamily Cyrtacanthacridinae of the family Acrididae. It is found in southeastern Asia, the type location being Singapore. [2] It was first described by the German zoologist Hermann Burmeister in 1838. There are more than twenty subspecies, most of which are endemic to different island groups; the subspecies V. nigricornis nigricornis is the type for the genus Valanga.

Contents

Description

There is considerable sexual dimorphism in this species with the males measuring 45 to 55 millimetres (1+34 to 2+18 in) in length and the females 15 to 75 mm (58 to 3 in). The adults are yellowish-brown, yellowish or green with bluish-black markings. The hind wings, which are visible in flight, are rose red. The nymphs are pale green with dark markings. [4]

Distribution

The Javanese grasshopper is native to Brunei, Cambodia, Indonesia, Malaysia, Papua New Guinea, the Philippines, Singapore, the Solomon Islands, Thailand, and Vietnam. It is mainly a woodland species and is found in forest clearings, on trees and shrubs. [4] It can be a serious pest in oil palm and rubber plantations, which are commonly found throughout its native range. [5] The species has also been recorded in Australia (Christmas Island only, it being 430 kilometres (267 mi) south of Java), Guam, India, Micronesia, and Palau. [6]

Life cycle

The life cycle of the Javanese grasshopper varies in different parts of its range, but in general, there is a single generation of insects each year. Up to four egg pods are laid in moist soil in forest clearings. When the eggs hatch, the nymphs pass through six or seven instar stages before becoming winged adults. Both nymphs and adults are diurnal and like to bask in the sun. They feed on tree foliage. [4]

In Java the eggs remain dormant throughout the dry season and take six to eight months to hatch. After the nymphal stages they become immature adults which soon mature and start breeding. In Thailand, the eggs hatch after about two months, the nymphs grow during the wet season and remain as immature adults during the dry season. In west Malaysia there are two peak egg-laying periods, December/January and June/July, which suggests there are two physiological races present. [4]

Outbreaks

The Javanese grasshopper is not gregarious and is not known to form swarms. Nevertheless, it is much more locally common in some years than others and outbreaks occur particularly in dry years; heavy rain causes high levels of mortality among eggs and nymphs. In Java, an outbreak in 1915 was thought to be caused by a succession of dry years which encouraged synchronization of breeding in concentrated areas. Clearing of forests for cultivation may also promote breeding. [4]

Control

Trap cropping may help to control V. nigrocornis. Atim et al 1987 demonstrates the use of Pueraria phaseoloides in the protection of Hevea brasiliensis . [7]

Related Research Articles

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Grasshopper Common name for a group of insects

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Greenhouse whitefly Species of true bug

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<i>Gryllus pennsylvanicus</i> Species of cricket

Gryllus pennsylvanicus is known as the fall field cricket. G. pennsylvanicus is common in southern Ontario, is widespread across much of North America and can be found even into parts of northern Mexico. It tends to be absent in most of the southwestern United States including southern California. Within its geographic range this field cricket will burrow into soil in fields and forest edges. Individuals inhabit grassy disturbed areas and are often found around areas of human habitation.

Senegalese grasshopper Species of grasshopper

The Senegalese grasshopper is a medium-sized grasshopper species found in the Sahel region of Africa, the Canary Islands, Cape Verde Islands, and West Asia. Although not called a locust in English, this species shows gregarious behaviour and some morphological change on crowding. In many parts of the Sahel, this species may cause greater year-on-year crop damage than better-known locusts, attacking crops such as the pearl millet.

<i>Melanoplus bivittatus</i> Species of grasshopper

Melanoplus bivittatus, the two-striped grasshopper, is a poikilothermic species of grasshopper belonging to the genus Melanoplus. It is commonly found in North America, with high quantities inhabiting Canadian prairies and farmland.

<i>Dociostaurus maroccanus</i> Species of grasshopper

Dociostaurus maroccanus, commonly known as the Moroccan locust, is a grasshopper in the insect family Acrididae. It is found in northern Africa, southern and eastern Europe and western Asia. It lives a solitary existence but in some years its numbers increase sharply, and it becomes gregarious and congregates to form swarms which can cause devastation in agricultural areas. The species was first described by Carl Peter Thunberg in 1815.

<i>Podisma pedestris</i> Species of grasshopper

Podisma pedestris is a species of 'short-horned grasshoppers' belonging to the family Acrididae subfamily Melanoplinae.

<i>Taeniopoda eques</i> Species of grasshopper

Taeniopoda eques, the western horse lubber grasshopper, is a relatively large grasshopper species of the family Romaleidae found in the arid lower Sonoran life zone of the southwestern United States and northern Mexico. Northern populations are identifiable by their shiny black bodies and black and yellow reticulated forewings. Some southern populations are yellow in the adult stage. The species is unique in using its black coloration to thermoregulate and in being chemically defended. The aposematic coloration warns vertebrate predators of its unpalatability and allows the grasshopper to roost conspicuously upon desert shrubs.

<i>Schistocerca americana</i> Species of grasshopper

Schistocerca americana is a species of grasshopper in the family Acrididae known commonly as the American grasshopper and American bird grasshopper. It is native to North America, where it occurs in the eastern United States, Mexico, and the Bahamas. Occasional, localized outbreaks of this grasshopper occur, and it is often referred to as a locust, though it lacks the true swarming form of its congener, the desert locust.

<i>Patanga succincta</i> Species of locust

Patanga succincta, the Bombay locust, is a species of locust found in India and southeast Asia. It is usually a solitary insect, and it is only in India that it has exhibited swarming behaviour. The last plague of this locust was in that country between 1901 and 1908 and there have not been any swarms since 1927. It is thought that the behaviour of the insects has altered because of changing practices in agricultural land use.

<i>Locusta migratoria manilensis</i> Subspecies of locust

Locusta migratoria manilensis, commonly known as the Oriental migratory locust, is a subspecies of the migratory locust in the family Acrididae. It is sufficiently different in size and structure from the African migratory locust to be considered a distinct subspecies of the migratory locust. It is found in southeastern Asia and is an important agricultural pest in the region. It is normally a solitary insect but when conditions are suitable, it enters into a gregarious phase when the young form into bands which move together and the adults into swarms. Although outbreaks may have recently been fewer in number and size because of changes in agricultural practices and better locust detection, the insects remain active as crop pests and the potential for outbreaks is still present.

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Locusta migratoria migratorioides, commonly known as the African migratory locust, is a subspecies of the migratory locust family Acrididae.

<i>Brachytrupes membranaceus</i> Species of cricket

Brachytrupes membranaceus, the tobacco cricket, is a species of cricket in the family Gryllidae. It is a pest of crops including young tobacco plants. There are four subspecies, all of which are native to Africa.

<i>Valanga irregularis</i> Species of grasshopper

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Cornops aquaticum is a semiaquatic species of grasshopper native to the Neotropics, from southern Mexico south to central Argentina and Uruguay. It feeds and breeds exclusively on members of the aquatic plant family Pontederiaceae, especially water hyacinth, and is being investigated as a possible biological pest control agent for the water hyacinth in countries where that plant is invasive.

<i>Valanga</i> Genus of grasshoppers

Valanga is a genus of "bird grasshoppers" in the subfamily Cyrtacanthacridinae. Species are found from the Indian subcontinent through southeast Asia and the Korean peninsula to Australia and the Pacific islands.

References

  1. 1 2 Hochkirch, A.; Willemse, L.P.M.; Tan, M.K. (2019). "Valanga nigricornis". IUCN Red List of Threatened Species . 2019: e.T107431005A107431295. doi: 10.2305/IUCN.UK.2019-1.RLTS.T107431005A107431295.en . Retrieved 20 November 2021.
  2. 1 2 "Valanga nigricornis (Burmeister, 1838)". Orthoptera Species File. orthoptera.speciesfile.org. Retrieved 2015-04-06.
  3. Burmeister H (1838) Handbuch der Entomologie 2 2(I-VIII): 629.
  4. 1 2 3 4 5 "Javanese grasshopper - Valanga nigricornis". Locust Handbook. Humanity Development Library. Retrieved 2015-04-06.
  5. "Valanga nigricornis (Burmeister, 1838)". The DNA of Singapore. Lee Kong Chian Natural History Museum. Retrieved 2015-04-07.
  6. "Valanga nigricornis (H.Burmeister, 1838)". Global Biodiversity Information Facility . Retrieved 7 June 2020.
  7. Shelton, A.M.; Badenes-Perez, F.R. (2006). "Concepts and Applications of Trap Cropping in Pest Management". Annual Review of Entomology . Annual Reviews. 51 (1): 285–308. doi:10.1146/annurev.ento.51.110104.150959. ISSN   0066-4170.