Chilocorus stigma

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Chilocorus stigma
Twicestabbed1.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Infraorder: Cucujiformia
Family: Coccinellidae
Genus: Chilocorus
Species:
C. stigma
Binomial name
Chilocorus stigma
(Say, 1835)

Chilocorus stigma, commonly known as the twice-stabbed ladybug, is a native resident of the United States and Canada. It also has been introduced to Hawaii. [1] It is shiny black, and there is one red spot on each elytron. The remainder of the body is black as well, but the abdomen is either yellow or red. It is sometimes confused with the "two-stabbed lady beetle", Chilocorus orbus , which is widespread in California. [2]

Habitat and pests eaten

C. stigma mainly lives within terrestrial/arboreal habitats, primarily feeding on aphids found in these habitats as well as scales (such as pine needle scale, beech bark scale and Florida red scale) and mealybugs. It is a beneficial insect, and is useful in both natural wood stands and commercial forests such as orchards and citrus groves. It is beneficial against non native species. An introduced Hemlock pest, the elongate hemlock scale ( Fiorinia externa Ferris), which has been doing considerable damage to Hemlock trees throughout North America, can be moderately controlled by the presence of C. stigma. [3] C. stigma is currently not a lady beetle that can be sold for commercial use in orchards or on farms.

Life cycle and issues

C. stigma usually completes two lifecycles a year in Canada and the North United States but may complete several lifecycles a year further down South. They overwinter in ground litter during the colder months. C. stigma has been shown, like other ladybeetles, to be susceptible to the use of insecticides diminishing its population in the wild. In order to preserve the benefits of this insect, pesticide users are encouraged to use natural alternatives to pesticide in order to curb the decline of C. stigma.

Chromosome variation

The chromosomes (karyotype) of Chilocorus stigma vary from one individual to another, in both the number of chromosomes (aneuploidy) and their structure (chromosomal polymorphism). [4] [5] The variability occurs as a result of chromosome fusions or disassociations. [6]

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<span class="mw-page-title-main">Hemlock woolly adelgid</span> Species of true bug

Adelges tsugae, the hemlock woolly adelgid or HWA, is an insect of the order Hemiptera native to East Asia. It feeds by sucking sap from hemlock and spruce trees. In its native range, HWA is not a serious pest because populations are managed by natural predators and parasitoids and by host resistance. In eastern North America it is a destructive pest that threatens the eastern hemlock and the Carolina hemlock. HWA is also found in western North America, where it has likely been present for thousands of years. In western North America, it primarily attacks western hemlock Tsuga heterophylla and has only caused minor damage due to natural predators and host resistance. Accidentally introduced to North America from Japan, HWA was first found in the eastern United States near Richmond, Virginia, in 1951. The pest is now found from northern Georgia to coastal Maine and southwestern Nova Scotia as well as areas of western Michigan near the eastern Lake Michigan shoreline. As of 2015, 90% of the geographic range of eastern hemlock in North America has been affected by HWA.

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<span class="mw-page-title-main">Coccinellidae</span> Family of beetles

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<span class="mw-page-title-main">Chilocorinae</span> Subfamily of beetles

The Chilocorinae are a subfamily of ladybugs in the family Coccinellidae. They feed predominantly on scale insects. They are usually shiny and often have no spots or patterns on their wing covers. Their bodies are in round helmet shapes. They are medium in size and are sometimes seen feeding on cowpea aphids. Some examples include the pine ladybird and kidney-spot ladybird which inhabit the UK, both of which are black ladybirds with red spots. A US example is the twice-stabbed lady beetle.

<i>Chilocorus</i> Genus of beetles

Chilocorus is a genus of beetles belonging to the family Coccinellidae, subfamily Chilocorinae.

<i>Aonidiella orientalis</i> Species of true bug

Aonidiella orientalis is a species of insect in the family Diaspididae, the armored scale insects. It is known commonly as the Oriental yellow scale. It is an agricultural pest on a wide variety of crop plants.

Hemiberlesia lataniae, the latania or palm scale, is a species of armored scale insect in the family Diaspididae. It was first described by the French entomologist Victor Antoine Signoret in 1869 using Latania lontaroides, a species of palm tree endemic to Réunion as its host; since then, it has been found on avocado trees growing in South Africa, Australia, Israel, the United States, and on a range of other plants in many parts of the world.

Chilocorus orbus is a species of lady beetle in the family Coccinellidae. It is native to North America. It is a black, domed beetle with two large red spots and is commonly called the twice-stabbed lady beetle or the two-stabbed lady beetle. Both adults and larvae feed on scale insects.

<i>Chilocorus cacti</i> Species of beetle

Chilocorus cacti, known generally as the cactus lady beetle or the twice-stabbed cactus lady beetle, is a species of lady beetle in the family Coccinellidae. It is native to the Caribbean region, North America, Central America, and South America. The adults and larvae feed on scale insects and attempts have been made to use it for biological pest control.

<i>Fiorinia externa</i> Species of scale insect

Fiorinia externa, the elongate hemlock scale was accidentally introduced into North America from Japan and is now established in most parts of the north-eastern U.S. It has become a serious pest of hemlock (Tsuga) and some related conifers from the family Pinaceae. Dense colonies of the scale insect result in yellowing, shedding of leaves, dieback and occasional tree death.

References

  1. "Chilocorus stigma". Integrated Taxonomic Information System . Retrieved 30 April 2006.
  2. Jerry A. Powell and Charles L. Hogue (1980). California Insects. University of California Press. ISBN   9780520037823. p. 299
  3. United States Department of Agriculture. "Elongate hemlock scale" . Retrieved 30 April 2006.
  4. Smith, S.G. (1956). "Extreme chromosomal polymorphism in a coccinellid beetle". Experientia. 12 (2): 52–53. doi:10.1007/bf02164672. S2CID   22243854.
  5. Smith, S.G. (1962). "Tempero-Spatial Sequentiality of Chromosomal Polymorphism in Chilocorus stigma Say (Coleoptera : Coccinellidae)". Nature. 193 (4821): 1210–1211. Bibcode:1962Natur.193.1210S. doi:10.1038/1931210a0. S2CID   34080845.
  6. White M.J.D. 1973. The chromosomes. Chapman & Hall, London. p169