raspberries and blackberries
Updated: June 14, 2021

 1) Japanese beetles

Japanese beetle on a leaf

Japanese beetles are metallic, coppery-brown and green, 1/4-inch-long beetles that often feed in large numbers, damaging the fruit and skeletonizing the foliage.

2) Brown marmorated stink bugs

brown marmorated stink bug
Photo: G, Hamilton, Rutgers

Stink Bugs

3) Cane borers 

The following three species of borers can infest brambles. 
No pesticide treatments are recommended. Prune damaged canes back into healthy wood. 

Raspberry cane borers 

  • They make two girdling rings of punctures about 1/2-inch apart and within 6 inches of the shoot tip, causing the cane tip to wilt suddenly. The damage is quite visible but has little effect on the quality or quantity of the crop. 

raspberry cane borer damage
Typical damage. Female makes two rows of punctures which encircle the
cane near the tip. An egg has been laid between the rows and frass can be
seen emerging from the oviposition hole
Photo: Bruce Watt, University of Maine, Bugwood.org

 

orange and black raspberry cane borer adult
Raspberry can borer
Photo: Jon Yuschock, Bugwood.org

Raspberry crown borers 

  • Can be very damaging to the bramble planting if not controlled.
  • The large (1/2-inch to 3/4-inch) larvae tunnel into the base of the crown of the plant causing the canes to be stunted or to wither and die.
Raspberry crown borer larva
Rasberry crown borer larva on blackberry
Photo:University of Georgia Plant Pathology , University of Georgia, Bugwood.org
black and yellow stripped raspberry crown borer
Raspberry crown borer adult
Photo: University of Georgia Plant Pathology , University of Georgia, Bugwood.org

Rednecked borers 

  • Are insects that cause small to large gall-like swellings with split bark on the canes.
  • Cane damage in the first year is more serious than damage to older canes because the wounds on younger canes provide a weakened spot for invasion by canker fungi and breakage by the wind.
swellings on canes from rednecked borer
Infested raspberry canes with typical swellings
Photo: James Solomon, USDA Forest Service, Bugwood.org

 

adult rednecked cane borer
Adult rednecked borer
Photo: Susan Ellis, Bugwood.org

4) Sap beetles and yellowjackets

sap beetle
Sap beetle adult
Photo: Joseph Berger, Bugwood.org
  • Sap beetles and yellowjackets are extremely common and pose problems when they attack ripening fruits in large numbers.
  • They feed largely on soft, overripe, and rotting fruits and vegetables and can be controlled by good sanitation in and around the planting and by harvesting ripe fruits regularly. Do not allow the fruit to become overripe.
  • For sap beetles, place plastic funnel traps (plastic soda bottles) in rows filled with vinegar, molasses, and water to capture this pest.

5) Spotted wing drosophila (SWD), (Drosophila suzukii)

The spotted wing drosophila (SWD), Drosophila suzukii, is a small vinegar fly with the potential to damage many fruit crops.