Phyllotreta

Chevrolat, 1836

flea beetles

Species Guides

18

Phyllotreta is a of flea beetles (Chrysomelidae: Alticini) comprising at least 300 described worldwide. Species are almost exclusively associated with plants in Brassicaceae and related in the order Brassicales, with 18% of species feeding on multiple families within this order. Many species are economically significant agricultural pests, particularly of crucifer crops including canola, cabbage, and turnip. The genus has independently colonised Brassicaceae and exhibits adaptations to the characteristic chemical defences (glucosinolates) of these host plants.

Phyllotreta by (c) skitterbug, some rights reserved (CC BY), uploaded by skitterbug. Used under a CC-BY license.Phyllotreta denticornis by (c) Cricket Raspet, some rights reserved (CC BY), uploaded by Cricket Raspet. Used under a CC-BY license.Phyllotreta bipustulata by (c) Even Dankowicz, some rights reserved (CC BY), uploaded by Even Dankowicz. Used under a CC-BY license.

Pronunciation

How to pronounce Phyllotreta: /ˌfɪloʊˈtriːtə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Small beetles, typically black or metallic, with enlarged hind adapted for jumping. Body shape generally elongate-oval. Many exhibit longitudinal stripes or other patterns on . Distinguished from related flea beetle by combination of tarsal formula, antennal structure, and male genitalia characteristics; accurate identification to species level often requires examination of .

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Habitat

Agricultural fields, gardens, and natural areas where plants in Brassicaceae and related occur. sites include field margins, shelterbelts, and other protected locations.

Distribution

; recorded across Europe, Asia, North America, and other regions. Specific distribution varies by .

Seasonality

of temperate overwinter and emerge in spring; activity patterns closely tied to plant .

Diet

Specialised feeding on Brassicaceae and related in order Brassicales (Capparaceae, Cleomaceae, Resedaceae, Tropaeolaceae). feed on leaves, often skeletonising tissue; larvae typically feed on roots or leaf petioles depending on .

Host Associations

  • Brassicaceae - primary plantsalmost all specialised on this
  • Capparaceae - plantsminor for some
  • Cleomaceae - plantsminor for some
  • Resedaceae - plantsminor for some
  • Tropaeolaceae - plantsminor for some
  • Microctonus vittatae - braconid of ; parasitised individuals emerge earlier from

Life Cycle

overwinter in protected sites. Spring followed by feeding, mating, and oviposition. Larval development occurs on plants, with feeding location varying by (foliage, roots, or petioles). typically in soil. Multiple per year possible in favourable conditions.

Behavior

jump readily when disturbed, using enlarged hind legs. Some exhibit border- patterns, gradually moving across fields from margins. Parasitised adults have been observed to emerge earlier from sites than unparasitised individuals.

Ecological Role

Herbivores specialised on Brassicaceae; significant agricultural pests reducing crop yields through foliar feeding and larval root damage. Serve as for including Microctonus vittatae.

Human Relevance

Major economic pests of crucifer crops worldwide. P. cruciferae and P. striolata are particularly significant pests of canola/rapeseed, cabbage, turnip, and other Brassicaceae crops. Damage includes skeletonised leaves, stunted growth, and plant death under heavy . Subject of extensive research, including evaluation of neonicotinoid .

Similar Taxa

  • PsylliodesBoth are flea beetles (Alticini) associated with Brassicaceae; Phyllotreta colonised Brassicaceae independently and differs in morphological details of tarsal structure and male genitalia
  • AlticaBoth are flea beetles with jumping hind legs; Phyllotreta distinguished by specialisation on Brassicaceae and specific morphological characters

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Sources and further reading