Northwest Michigan fruit update – September 5, 2023

Nikki Rothwell and Erin Lauwers, Michigan State University Extension -

Harvest for early apple varieties has begun in northwest Michigan and the scouting season for certain pests and diseases is winding down.

Evercrisp apples hanging from a branch.
Evercrisp apples at the Northwest Michigan Horticulture Research Center. Photo by Erin Lauwers, MSU Extension.

Pest report

Apple maggot. An average of one apple maggot was trapped this week at the Northwest Michigan Horticulture Research Center.

Black stem borer. None were caught this week at the Northwest Michigan Horticulture Research Center.

Codling moth. An average of 3.6 codling moth were trapped at the Northwest Michigan Horticulture Research Center. We are seeing codling moth damage in unsprayed blocks at the station. Michigan State University Extension advises growers to trap for codling moth in individual blocks as populations can vary locally. The threshold for applying an insecticide for second generation adults is five moths per trap.

Obliquebanded leafroller. An average of 0.6 obliquebanded leafroller were caught in apple blocks of the Northwest Michigan Horticulture Research Center trapline.

Oriental fruit moth. None were caught at the Northwest Michigan Horticulture Research Center.

San Jose scale. Adult flight of the second generation continues at the Northwest Michigan Horticulture Research Center.

Spotted tentiform leafminer. We caught an average of 104 spotted tentiform leafminer per trap this week.

This article was published by Michigan State University Extension. For more information, visit https://extension.msu.edu. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464).

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