In this Issue:

FEATURE ARTICLE

Insect Migration Forecast System for the Midwest

VEGETABLE NEWS

Vegetable Insect Pest Update

STRAWBERRY NEWS

Bronzing in Strawberries

APPLE NEWS

Apple Scab Infections

Take Note! Adult Apple Maggot Emergence

Weekly Trap Counts

Order: 2007 Minnesota Vegetable Guide

Insect, Pest Fact Sheets

Take Note! Adult Apple Maggot Emergence

In 2006, adult apple maggot (AM) began emerging on approximately June 26^th.  Apple maggot overwinter as pupae in the soil.  In Minnesota, adult flies emerge from the soil from late June to early July.  When freshly emerged, AM flies are sexually immature and feed mainly on aphid honeydew.  It takes about a week or more for newly emerged flies to become sexually mature, at which time they will congregate on the apple fruit and mate.  After mating, female AM lay eggs singly under the skin of an apple fruit.  The eggs hatch into larvae in 2 to 10 days, depending on temperature.  AM larvae feed with in the apple and pass through three instars (stages).  Larval development within the fruit usually continues for 20 to 30 days.  Infested fruits usually fall to the ground at this stage, allowing the maggots to leave the fruit, burrow into the soil (1” to 6”), and molt to a fourth instar.  This fourth instar quickly molts again into the pupal stage. AM pupae are found enclosed within puparia made by the larvae.

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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.

DISCLAIMER

Reference to products in this publication is not intended to be an endorsement to the exclusion of others which may have similar uses. Any person using products listed in this publication assumes full responsibility for their use in accordance with current manufacturer directions.

Last Revised June, 2007 by woldx018@umn.edu
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