MN Fruit & Vegetable IPM News - Vol. 4, No. 1

The Minnesota Department of Agriculture (MDA) apple insect monitoring program will focus on seven insects this year. Data will be collected from traps monitored by MDA staff and from self-monitoring orchard cooperators. I am pleased to welcome back returning cooperators who will be involved in the project for another year. Thanks you for your participation.

The apple pests that will be monitored for are listed below.

Apple maggot (AM)

Fruit injury is due to adult female egg-laying punctures (dimples), or larvae tunneling inside the fruit resulting in brown streaks and decay. AM can be distinguished from other fruit flies by the wing banding patterns. AM flight is usually monitored using sticky traps baited with attractants.

Codling moth (CM)

Fruit injury is in the form of a sting or a deep entry.

Dogwood Borer (DWB)

Larvae feed on burr knot tissue in the trunk. This type of feeding is characterized by the presence of brown frass on the surface of infested tree trunks.

Lesser appleworm (LAW)

Like codling moth (CM), larvae of lesser appleworm (LAW), feed inside apple fruit.

Obliquebanded leafroller (OBLR)

Feeding injury could occur to foliage (leaves) and the fruit. Overwintered larvae begin to feed on developing fruit immediately after petal fall. Many damaged fruits will drop, but those remaining on the tree will show corky scars at harvest. Summer larvae may also feed on the fruit.

Redbanded leafroller (RBLR)

RBLR can cause injury to both foliage (leaves) and fruit. Leaf-feeding could produce a skeletonized area near the midrib or rolled leaves typical of leafrollers. Fruit injury occurs when a rolled leaf is tied to a fruit or when fruits are webbed together. RBLR fruit injury is usually more shallow and superficial than that caused by obliquebanded leafroller, the other major leafroller species in Minnesota .

Spotted tentiform leafminer (STLM)

STLM feeding injury within the mines can reduce leaf photosynthesis. Reduction in photosynthesis can affect fruit set, size, and quality. Furthermore, STLM infestation may cause leaf drop and premature fruit drop.

More information on these apple pests is available in: Field Guide for Identification of Pest Insects, Diseases, and Beneficial Organisms in Minnesota Apple Orchards and Integrated Pest Management Manual for Minnesota Apple Orchards

If you have questions about the program, contact Jean Ciborowski at the MDA, 651-201-6217.

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ACKNOWLEDGEMENTS

Co-Editors: Bill Hutchison (hutch002@umn.edu), Department of Entomology, University of Minnesota, Jeanne Ciborowski, Minnesota Department of Agriculture, Ag. Resources Management and Development Division, and Suzanne Wold-Burkness (woldx018@umn.edu), Department of Entomology, University of Minnesota

The Newsletter is published weekly from May through August, cooperatively, by the Minnesota Department of Agriculture (MDA) and the University of Minnesota (U of MN). Reports are posted on the U of MN and MDA web sites on Fridays. If you have suggestions and/or comments, please send your contributions by 4 p.m., Wednesday to Jeanne Ciborowski, 651-201-6217, jeanne.ciborowski@state.mn.us , MDA, 625 Robert St. North, St. Paul, MN 55155. You can access the Newsletter at the U of MN web site in htm format at: www.vegedge.umn.edu/MNFruit&VegNews/mnindex.htm and at the MDA web site in pdf format at: www.mda.state.mn.us/plants/pestmanagement/ipm/ipmnews.htm

Partial funding for this publication is provided through partnership agreements with the Minnesota Fruit and Vegetable Growers Association (MFVGA) and the United States Department of Agriculture – Risk Management Agency (RMA). These institutions are equal opportunity providers.

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