Flea beetle

The flea beetle is a small, jumping beetle of the leaf beetle family (Chrysomelidae), that makes up the tribe Alticini which is part of the subfamily Galerucinae. Historically the flea beetles were classified as their own subfamily.

Flea beetles
Phyllotreta vittula with characteristic feeding damage to Brassicaceae leaf
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Chrysomelidae
Subfamily: Galerucinae
Tribe: Alticini
Spinola, 1844
Genera

Many, see text

Altica species larva
Disonycha xanthomelas
Luperaltica nigripalpis

Though most tribes of the Galerucinae are suspect of rampant paraphyly in the present delimitation, the Alticini seem to form a good clade.

Description and ecology

The adults are very small to moderately sized Chrysomelidae (i.e. among beetles in general they are on the smallish side). They are similar to other leaf beetles, but characteristically have the hindleg femora greatly enlarged. These enlarged femora allow for the springing action of these insects when disturbed. Flea beetles can also walk normally and fly. Many flea beetles are attractively colored; dark, shiny and often metallic colors predominate.

Adult flea beetles feed externally on plants, eating the surface of the leaves, stems and petals. Under heavy feeding the small round holes caused by an individual flea beetle's feeding may coalesce into larger areas of damage. Some flea beetle larvae (e.g. of Phyllotreta species) are root feeders.

In adverse weather conditions (rain, for example) some flea beetles seek shelter in the soil. Some species, such as Phyllotreta cruciferae and P. striolata, prefer to leave their hideouts only during warm and dry weather. The German name Erdflöhe (literally "earth fleas") refers to their jumping ability and this behavior of hiding in the soil.

Relationship with humans

Flea beetles may be beneficial or may be pests, depending on the species.

Pest

Many major agricultural crops are attacked by flea beetles, including various cruciferous plants such as mustard and rapeseed (particularly canola in northwestern North America). Numerous garden plants are also subject to flea beetle feeding, such as flowers of Gardenia and Rothmannia by Altica species.

Flea beetles execute their most severe attacks during dry weather and are most active on sunny days. The larvae are known to chew roots.[1]

Companion plant
See also: List of companion plants

Flea beetles can be deterred by a number of different companion plants, that can be grown intercropped in a garden to benefit neighboring plants. For example, thyme, catnip, and other kinds of mint cover up the scent of nearby plants[2]

Radishes, on the other hand, can be grown as a trap crop, luring the flea beetles away from more important crops. Since the root isn't harmed by the beetles, they remain useful, themselves.[3] A number of natural predators can be employed to keep flea beetles in check, including two that parasitize it: Braconid wasps and tachinid flies. In both cases, the larval stage feeds on the flea beetle, while the adults feed on nectar and pollen; some species are even important pollinators.

To encourage Braconid wasps and Tachinid flies, some types of flowers can be planted between crops: umbels such as caraway, herb fennel, coriander and Ammi majus, and simple open flowers such as California poppies and pot marigolds, as well as yarrows.[4]

Beneficial insect

Other flea beetle species are beneficial, feeding on weeds and similar nuisance plants. A few species have even been introduced to various locations as biological control agents against some weeds. One important example is in the control of Leafy Spurge (Euphorbia esula), an invasive weed in the United States. It has a toxic latex and is generally avoided by herbivores. Flea beetles of the genus Aphthona have been successfully introduced to control this plant.

Selected genera

This genus list is not complete. It is also partially from ITIS and might include genera placed elsewhere in other sources.

Data sources: i = ITIS,[8] c = Catalogue of Life,[9] g = GBIF,[10] b = Bugguide.net[11]

  • Apteropeda orbiculata
  • Argopistes coccinelliformis amid feeding damage on Osmanthus × fortunei
  • Crepidodera aurata
  • Podagrica fuscicornis
  • Altica lythri. Note thick hindleg femora
  • Eight-spotted flea beetle Omophoita cyanipennis octomaculata
  • Altica larva
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References
  1. Squire, David (2007). The Garden Pest & Diseases Specialist: The Essential Guide to Identifying and Controllong Pests and Diseases of Ornamentals, Vegetables and Fruits. New Holland Publishers. p. 35. ISBN 978-1845374853. Retrieved November 12, 2012.
  2. "Garden Toad's Companion Plants". Archived from the original on 2014-07-01.
  3. 5 Secrets to Vegetable Garden, Companion Planting Revealed
  4. Alys Fowler: flea beetle
  5. Linzmeier, Adelita M.; Konstantinov, Alexander S. (2018). "Andersonoplatus, a new, remarkable leaf litter inhabiting genus of Monoplatina (Coleoptera, Chrysomelidae, Galerucinae, Alticini)". ZooKeys (744): 79–138. doi:10.3897/zookeys.744.22766. PMC 5904521. PMID 29670446.
  6. Moseyko, Alexey G.; Kirejtshuk, Alexander G.; Nel, Andre (2010). "New genera and new species of leaf beetles (Coleoptera: Polyphaga: Chrysomelidae) from Lowermost Eocene French amber". Annales de la Société Entomologique de France. Nouvelle Série. 46 (1–2): 116–123. doi:10.1080/00379271.2010.10697645.
  7. D'Alessandro, Paola; Biondi, Maurizio (2018). "Ugandaltica gen. n., a tiny flea beetle from the forest canopy in Central Africa (Coleoptera, Chrysomelidae, Galerucinae, Alticini)". ZooKeys. 746: 123–136. doi:10.3897/zookeys.746.23637. Retrieved 3 April 2018.
  8. "Alticini Report". Integrated Taxonomic Information System. Retrieved 2018-04-12.
  9. "Catalogue of Life". Retrieved 2018-04-12.
  10. "GBIF". Retrieved 2018-04-12.
  11. "Alticini Tribe Information". BugGuide.net. Retrieved 2018-04-12.
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