Western Spotted Cucumber Beetle
( Diabrotica undecimpunctata )


2014-0601-01100108-COL00323-Diabrotica_undecimpunctata[1024h36s,F,A,plant-flower]{EXD}-G.jpg

PHOTO COMMENT

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 Name
Knowland Park, Knowland Park, Oakland
County:Alameda County
ECI Site#:CA01100108

RECOGNITION
Description
These insects are widely mistaken for lady beetles, but are only distantly related. Adult: Elytra and thorax are pale green. Elytra with 11 black spots. Head, antennae and legs are all black.
Body Length
Adult: 5-9 mm. Larva: Up to 8 mm.

BIOLOGY
Food
Adults prefer tender, succulent portions of plants, including the flowers and leaves, which they may destroy with their feeding, it is the damage to the surface of the melon that reduces marketable yield.
Importance
Adults feed upon and damage the leaves and fruits of many crops, including cucumbers, soybeans, cotton, beans, and many others. Cucumber beetles also spread squash mosaic virus.
Range
Widely distributed across America north of Mexico, except north in the northern Rocky Mountains.
Importance
Adults feed upon and damage the leaves and fruits of many crops, including cucumbers, soybeans, cotton, beans, and many others. Cucumber beetles also spread squash mosaic virus.
Development
Eggs are laid at soil surface or below at the base of food plants. Larvae hatch in 7-10 days and begin to feed on plant roots right away and continue for 3-6 weeks. Pupation occurs at the base of host plants. Adults eclose in 1-2 weeks. There are about three generations a year. Beetles overwinter as adults and are active by the time the earliest melons are planted in spring.

CREDITS
Photographer
Eddie Dunbar
Insect Sciences Museum of California

References
Species Diabrotica undecimpunctata - Spotted Cucumber Beetle. (bugguide.net/node/view/456). Accessed July 9, 2016. .
ITIS.
Spotted cucumber beetle. (https://en.wikipedia.org/wiki/Spotted_cucumber_beetle). Accessed September 24, 2016.


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