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Looking Ahead
Volume 60 Number 11 Date 07/02/2015 SPOTTED WING DROSOPHILA - Emergence of the first flies of the season was documented by UW researchers on June 22 in Dane County. Several male and female specimens were captured in a yeast and sugar trap at a Cottage Grove monitoring location. Last year the first flies were collected on June 30 and infestations in raspberries and other fruits were prevalent by mid-July. The early appearance of SWD adults should be viewed as a warning to fruit growers to increase monitoring efforts and make preparations for possible insecticidal control. The use of insecticides is not advised until SWD infestation is verified by trapping or visual inspection. CEREAL LEAF BEETLE - Larvae are reportedly causing light to moderate defoliation of wheat in Dane, Columbia, Rock, Sheboygan and Winnebago counties. Economic damage has not been observed thus far, though individual plants are showing significant feeding on the flag leaf. Larval populations must reach or exceed three larvae per plant or one larva per flag leaf to qualify for treatment. WESTERN BEAN CUTWORM - The annual flight has started in southern Wisconsin where the first moths appeared in pheromone traps from June 18-24. Only six additional moths were collected in Columbia, Sauk and Waushara counties this week. Participants in the DATCP western bean cutworm trapping network are reminded to begin reporting weekly moth totals to Tracy Schilder at tracy.schilder@wisconsin.gov or by phone at (608) 224-4544 by July 8. EUROPEAN CORN BORER - The treatment window for first generation larvae has closed near Beloit, La Crosse, Lone Rock, Madison and other southern locations where 1,100 degree days (modified base 50°F) were surpassed as of July 1. Third and fourth-instar larvae are entering corn midribs, tassels and stalks. Chemical control remains an option in the southeastern, central and northern counties for another one or two weeks. APPLE MAGGOT - Adult flies were captured on traps in Dane and Iowa County apple orchards earlier this week, marking the start of the adult emergence period. Close monitoring of red sphere and yellow sticky traps is recommended, particularly for orchards impacted by recent heavy rain. The apple maggot fly is distinguished from similar fruit flies by an F-shaped wing banding pattern and a pronounced white spot on the thorax. -- Krista Hamilton, DATCP Entomologist 
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