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Brown Marmorated Stink Bug


brown marmorated stink bug
Image courtesy of David R. Lance, USDA APHIS PPQ,

Hosts:  all tree fruits, plus many vegetables, landscape ornamentals, and some row crops

:  Adults are shield-shaped, mottled brown, and are approximately 5/8 inch long. They overwinter under rocks, logs, and leaves but may also enter homes, garages and other sheltered buildings. Adults become active in the spring to feed and mate. Females deposit clusters of 20 - 30 pale green eggs on the undersides of leaves. Newly hatched nymphs have yellow to red abdomens with black stripes and huddle around the egg mass.  Nymphs darken with age, and disperse from the egg mass.

  Feeding can cause areas of collapsed tissue that appear as dried and necrotic (dark colored) lesions on fruit skin, but can also cause deeper, less obvious damage.

  Traps with pheromone lures, visual observations, beating trays, and sweep nets are some methods being used to detect the presence of BMSB. Research is currently underway to develop more effective monitoring of BSMB.

Treatment Threshold:
  No threshold determined.

Degree Day Model:

  • upper threshold: 92°F
  • lower threshold: 54°F
  • start/biofix date:  January 1
BMSB Life Stage Degree Days
  overwintering adults become active 360
  overwintering adults lay eggs 566
  egg hatch of summer generation 700
  first adults of summer generation 1608
  summer gen. adult activity peaks 2213


Management Considerations:  No BMSB have been found to cause economic damage yet in the Intermountain West. Orchards in counties that have detected the stink bugs should consider monitoring on the borders, especially those near vegetable fields.