Northwest berry Foundation

Management Detail


in Blackberries

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Latin name: Euschistus conspersus, and other species


Reason for Concern:
1) Adults and egg masses on ripe fruit reduce quality and can be a harvest fruit contaminant.
2) Stink bugs feed on developing seeds and on stems and foliage when seeds are not present.
3) The degree of damage depends, on the plant development stage when it is pierced by stink bugs. Punctured immature fruit and pods deform as they develop.

Adult - Shield-shaped, green or brown and 14.0 to 19.0 mm long. Barrel-shaped eggs of the green stink bug are yellow to green, later turning pink to gray, about 1.4 x 1.2 mm. The white, kettle-shaped eggs of the brown stink bug are slightly smaller.

Nymph - Smaller than adults, but similar in shape. Green stink bug nymphs are predominantly black when small, but become green with orange and black markings as they mature. Nymphs of the brown species turn light green.

Life Cycle:
Overwintering as adults in ditch banks, under boards or similar materials, they become active in spring. Each female lays several hundred eggs in clusters (averaging 36 eggs) on leaves and stems but also on pods. Nymphs hatch and pass through 5 instars before becoming adults. Nymphs and adults pierce plants with needlelike mouthparts, sucking sap from pods, buds, blossoms and seeds. About 4 to 5 weeks elapse between hatching and adult emergence with high populations in fall.



  • Before harvest, sample field with a beating tray to determine size of stinkbug population.
  • Train workers on harvesting machines to communicate presence of stinkbugs. Keep a container for the workers to put insect contaminants. This can be used monitor their numbers.

    Cultural Controls:

    None listed at present.


    For information about chemical controls, check with our Pesticide Guide.


    photo by K. Gray

    photo by K. Gray

    Green stinkbug nymph - photo by K. Gray

    photo University of Georgia

    photo by K. Gray

    photo by T. Peerbolt

    photo by T. Peerbolt


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