Michigan brown marmorated stink bug report for Sept. 23, 2016

Nymph and adult trap counts continue climbing, especially in the southwest and Fruit Ridge production areas. Fruit and vegetable growers in the southern Lower Peninsula should be scouting.

Nymphs and adults caught in baited traps at the edge of fruit and vegetable plantings and a few urban sites in the Lower Peninsula. Line indicates the percent traps that caught any BMSB; squares indicate average number captured per trap in a given week.

Nymphs and adults caught in baited traps at the edge of fruit and vegetable plantings and a few urban sites in the Lower Peninsula. Line indicates the percent traps that caught any BMSB; squares indicate average number captured per trap in a given week.

This is the eighth report of the Michigan State University Extension brown marmorated stink bug monitoring network. Traps were checked at more than 80 sites for brown marmorated stink bug nymphs and adults using pyramid or Rescue style traps baited with commercial lures. This week, 47 nymphs and 391 adults for a total of 438 brown marmorated stink bugs were captured from 31 traps at 15 sites (see graph for season trend). This is almost twice the number of brown marmorated stink bugs that were captured in traps last week.

The majority of brown marmorated stink bugs caught in traps continue to be from Berrien (apple, grape, peach, and urban), Kent (apple), Ottawa (apple), Saginaw (urban) and Van Buren (grape) counties. Since nymphs and adults can cause damage when they feed on fruit, growers in the southern part of the Lower Peninsula are strongly encouraged to scout for brown marmorated stink bugs – if they haven’t in the past – based on where we know it to be well-established as a nuisance pest in homes.

Traps are easy to deploy and check, but the area of influence for a single baited trap appears to be relatively small, so it is important to place them near the crop and combine trapping with other sampling methods such as limb-jarring of fruit tree branches over beating trays or sweep-netting in orchard edges close to woodlots and riparian areas. Visual inspection of orchard edges for the presence of fruit injury, or for the insects themselves, is recommended, especially in Berrien, Van Buren, Kent, Ottawa and Genesee counties where we have known populations or where damage to fruit in commercial peach and apple orchards was reported last season.

Damage to fruit from brown marmorated stink bug feeding can be confused with several disease or nutrient deficiencies, depending on the particular fruit that is affected, so it is important to involve your local MSU Extension fruit educator to help determine what caused the damage or send samples to MSU Diagnostic Services.

Counties being monitored for BMSB in 2016 are: Allegan, Antrim, Benzie, Berrien, Clare, Genesee, Grand Traverse, Ingham, Ionia, Kalamazoo, Kent, Lapeer, Leelanau, Lenawee, Livingston, Macomb, Monroe, Oakland, Oceana, Ottawa and Van Buren. Traps are set up near apple, stone fruits (peach, plum, sweet and tart cherry), blueberry, grape, strawberry, a variety of vegetable crops and at several urban locations considered to be hotspots.

For more information about management strategies in fruit should populations reach levels that would require control, please refer to the MSU Extension bulletin E0154, “2016 Michigan Fruit Management Guide.” To learn more about how to monitor for brown marmorated stink bugs, distinguish it from other similar-looking stink bugs and what plants it favors, visit MSU’s Brown Marmorated Stink Bug website.

The table below contains a full listing of crop or habitat by county where brown marmorated stink bugs (BMSB) are being monitored using baited traps this season as part of the MSU Extension statewide monitoring effort.

Crop or habitat where BMSB are being monitored

Crop or habitat type by countyNo. sites where BMSB traps are being monitored in 2016No. sites where BMSB has been captured in 2016Cumulative BMSB captured in 2016
Apple (36 sites)
Allegan 1 0 -
Antrim 1 0 -
Benzie 1 0 -
Berrien 6 4 490
Genesee 1 0 -
Kent 12 6 119
Lenawee 2 0 -
Livingston 1 0 -
Macomb 1 0 -
Monroe 2 0 -
Oakland 1 0 -
Oceana 6 0 -
Ottawa 1 1 62
Van Buren 1 1 1
Berry crops (blueberry, raspberry, strawberry; 6 sites)
Allegan 2 0 -
Berrien 1 0 -
Ottawa 2 0 -
Van Buren 1 0 -
Cherry, sweet or tart (11 sites)
Allegan 1 0 -
Antrim 1 0 -
Benzie 1 0 -
Grand Traverse 1 0 -
Kent 1 0 -
Leelanau 2 0 -
Lenawee 1 0 -
Van Buren 3 1 2
Grape (18 sites)
Allegan 2 0 -
Berrien 9 7 121
Ingham 1 1 2
Ionia 1 0 -
Van Buren 5 2 52
Peach (4 sites)
Berrien 4 2 13
Pear (pear 1 site)
Berrien 1 0 -
Van Buren 1 0 -
Vegetables (sweet corn, peppers, asparagus; 3 sites)
Macomb 1 0 -
Oceana 1 0 -
Ottawa 1 1 1
Urban/Residential (5 sites)
Berrien 1 1 28
Grand Traverse 1 0 -
Kalamazoo 1 0 -
Lapeer 1 0 -
Saginaw 1 1 63
TOTAL 86 28 954

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