Michigan brown marmorated stink bug report for August 18, 2015

Only one site near Stevensville, Michigan, is reporting brown marmorated stink bugs in traps this week.

In the seventh weekly report of the Michigan State University Extension brown marmorated stink bug (BMSB) monitoring network, only one trap out of the 60 being monitored in the major fruit production regions and nearby urban areas caught any BMSB this week. This particular trap is located in the same urban hotspot in Stevensville, Michigan, in Berrien County where we have been catching BMSB for the last few years. Of the individuals caught in the trap, 17 were nymphs and only one was an adult BMSB.

The area of influence for a single baited trap appears to be relatively small, so it is important when using them to monitor for this pest, to place them near favored plant hosts and to combine trapping with other sampling methods as described last week, such as beat sampling 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 also recommended. It appears that for most of the state, numbers are still well below levels that would trigger specific control measures and current management programs aimed at summer insect pests would likely provide some protection against any BMSB that may be present in orchards.

For more information about management of BMSB should populations reach levels that would require control, please refer to the MSU Extension Bulletin E0154, “2015 Michigan Fruit Management Guide.” To learn more about how to monitor for BMSB, distinguish it from other similar-looking stink bugs and what plants it favors, visit MSU’s Brown Marmorated Stink Bug website.

The purpose of the MSU Extension BMSB monitoring network and weekly reports is to provide early warning should population increases of BMSB occur in areas where susceptible crops are grown. Based on what is currently known about the biology of BMSB and its favored crop and non-crop habitats, commercial fruit and vegetable plantings have been selected that are adjacent to riparian habitats, woodland, soybean fields, major transportation corridors or various combinations of these attributes. Traps are baited with a commercially available lure and have been set up in apples, stone fruits including peaches, plums, sweet and tart cherries, blueberries, grapes, strawberries and a variety of vegetable crops. Several urban locations where BMSB were reported last year are also being monitored.

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