Amrasca biguttula

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Amrasca biguttula
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Hexapoda
Class:
Insecta
Order:
Hemiptera
Suborder:
Auchenorrhyncha
Infraorder:
Cicadomorpha
Superfamily:
Membracoidea
Family:
Cicadellidae
Subfamily:
Typhlocybinae
Tribe:
Empoascini
Genus:
Amrasca
Species:
A. biguttula
Subspecies:
A. biguttula biguttula
Binomial name
Amrasca biguttula
Ishida, 1912 [1]

Amrasca biguttula, commonly known as the cotton jassid,[2] is a subspecies of leafhopper belonging to the subfamily Typhlocybinae of family Cicadellidae. It is a pest of cotton, okra, and other crops in southern Asia and West Africa.[3]

Description

The adult cotton jassid is a long and slender insect about 2.6 mm (0.1 in) in length. It is yellowish-green, with a conspicuous black spot on either side of the head and another near the tip of the fore wing. The head is pale green and the membranous wings transparent and iridescent. On leaf surfaces, the insect tends to move about diagonally,[4] and when disturbed it immediately jumps and flies away.[2]

Life cycle

Leafhoppers undergo direct development from nymph to adult without undergoing metamorphosis. On okra, eggs are mainly oviposited inside the tissue of leaf blades, but may also be laid in leaf stalks or in soft twigs. The eggs hatch in six or seven days. There are five nymphal instars, developing over a period of about seven days. Nymphs are wingless. Total lifespan is about one month, with females living a little longer than males. The fecundity of females is about fifteen eggs. Adults are attracted to light, females more than males.[4]

Ecology

Leafhoppers have mouthparts designed for piercing and sucking, enabling them to feed on plant

grasses, including lawns of Bermuda grass.[6]

Damage

Heavy infestations on cotton, okra, and sunflower make the leaves turn yellow, curl up and fall off. The insects also secrete

sooty mould often grows on this, restricting the amount of light reaching the plant's photosynthetic surfaces and reducing the yield.[6] In many areas, this pest regularly occurs on cotton in epidemic numbers.[7] A number of natural enemies help to control populations including ladybirds, predatory lygaeid bugs, and several species of mantis. Neem oil can be used as a biopesticide.[8]

Control

On cotton, it has been found that growing a cultivar with hairs on the undersides of the leaves reduces infestation, and that long hairs are better at deterring the insect from laying than are short hairs; this seems to be due to the hairs preventing the insect from getting close enough to the leaf surface to deposit its eggs.[9]

Entomophthoraceae fungus Batkoa amrascae S. Keller & Villac. (1997) is known to infect (and also kill) the cotton leafhopper, Amrasca biguttula in the Philippines.[10]

References

  1. ^ "Amrasca biguttula biguttula". UniProt. Retrieved 15 November 2019.
  2. ^ a b "Cotton jassid". Plantwise Knowledge Bank. CABI. Retrieved 22 November 2019.
  3. ^ Maxime, KABORE (2023-01-26). "Filière coton : Le Burkina perd 65 milliards de FCFA de recette d'exportation en 2023". Burkina24.com - Actualité du Burkina Faso 24h/24 (in French). Retrieved 2023-01-27.
  4. ^
    S2CID 85972344
    .
  5. ^ Maxime, KABORE (2023-01-26). "Filière coton : Le Burkina perd 65 milliards de FCFA de recette d'exportation en 2023". Burkina24.com - Actualité du Burkina Faso 24h/24 (in French). Retrieved 2023-01-27.
  6. ^ a b Singh, Anita; Singh, Jarmanjeet; Singh, Khushwinder; Rani, Poonam (2018). "Host range and biology of Amrasca biguttula biguttula (Hemitpera: Cicadellidae)". {{cite journal}}: Cite journal requires |journal= (help)
  7. ISBN 978-1-4200-8848-9
    .
  8. ISBN 978-93-86102-01-0
    .
  9. ISSN 0378-9519
    .
  10. ^ Philippine Association of Entomologists Philippine Entomologist, Volumes 11-12 (1997), p. 81, at Google Books
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