Western Spotted Cucumber Beetle
( Diabrotica undecimpunctata )


2010-0705-01100101-COL00323-Diabrotica_undecimpunctata[1228h28s,F,A,plant-blackberry-blossom]{EXD}-G.jpg

PHOTO COMMENT
Often mistaken for Lady Beetles, this insect is a serious pest in gardens where it feeds upon many kinds of plants, including roses. The elytra and thorax are pale green. The elytra has black spots. Head, antennae and legs are all black. The related Striped Cucumber Beetle (Acalymmatrivit ttatum) occurs here also, but is not as common. It is pale green with black stripes.

IDENTIFICATION
Identification:Diabrotica undecimpunctata
(Mannerheim, 1843)
Common Name:Western Spotted Cucumber Beetle
Life Stage:(A) adult

PHYLOGENY

Phylum:Arthropoda
Class:Insecta
Superorder:Holometabola
Order:Coleoptera
Suborder:Polyphaga
Family:Chrysomelidae
Subfamily:Galerucinae
Tribe:Luperini
Genus:Diabrotica
Taxon Code:COL00323
ITIS TSN#:720266

LOCATION DETAILS
Location
ISMC Garden - Oakland, Melrose District, 5209 Congress Ave, Oakland
County:Alameda County
ECI Site#:CA01100101

RECOGNITION
Adults yellow to green with eleven black spots on the elytra.
Body Length
Adult: 5-9 mm. Larva: Up to 8 mm.

BIOLOGY
Host
Larvae feed on roots of a wide range of plants, including many field crops.
Development
Overwinters as an adult in southern states. Eggs are laid at soil surface or below at the base of food plants. Larvae hatch in 7 - 10 days and feed for three to six weeks. The larvae pupate at the base of host plants and emerge as adults in 1-2 weeks.
Importance
Considered a major pest of many field crops including cucumbers and other squashes, corn, soy. Beetles also transmit crop diseases such as bacterial wilt. Adults also reported damaging to garden plants including hibiscus, roses.
Range
Widely distributed across America north of Mexico, except north in the northern Rocky Mountains.

HABITAT

CREDITS
Photographer
Eddie Dunbar

REFERENCES
  • Species Diabrotica undecimpunctata - Spotted Cucumber Beetle. (bugguide.net/node/view/456). Accessed July 9, 2016. [ IMAGES ]
  • Integrated Taxonomic Information System TSN#720266


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