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Looking Ahead
Volume 59 Number 18 Date 11/13/2014 PEST HIGHLIGHTS OF 2014 CORN ROOTWORM - Beetle populations declined for the fourth straight year. The survey of adult rootworms in August found a state average of 0.4 beetle per plant, a slight decrease from the 2013 average of 0.5 beetle per plant and the second lowest count in the last 10 years. Results of the survey are summarized in the CORN section. LILY LEAF BEETLE - A new state record was established on June 25 with the first detection of lily leaf beetle, an introduced pest of cultivated lilies. The striking red and black beetles and their larvae were found by inspectors in a Marathon County nursery. Another 17 reports of the beetles and larvae were received from July to September. All of the Wisconsin lily leaf beetle finds to date have originated from the Kronenwetter, Mosinee and Rothschild areas of Marathon County. SPOTTED WING DROSOPHILA - This rapidly spreading, invasive Asian vinegar fly was captured by UW-Madison researchers in 20 counties this year. Since 2010, spotted wing drosophila has been found in 36 of the state's 72 counties, from Kenosha in the southeast to Bayfield in the northwest. Its seasonal life history in Wisconsin is not yet fully understood and it remains unclear if the flies overwinter locally or reinvade each season. Overwintering is suspected, but has not been confirmed. WESTERN BEAN CUTWORM - Moth counts decreased to the lowest level in the last decade, according to annual trapping survey results. The 2014 cumulative capture of 521 moths in 108 traps was a 21% reduction from the 663 moths collected in 114 traps last year and the lowest since surveys for this insect began in 2005. Larval populations were likewise very low this season. EMERALD ASH BORER - DATCP expanded the EAB quarantine boundaries in 2014 to include new detections in Adams, Buffalo, Calumet, Columbia, Door, Grant, Monroe and Oneida counties, as well as eight other counties in close proximity to EAB infestations: Green, Iowa, Juneau, Kewaunee, Lafayette, Manitowoc, Outagamie and Richland. After the addition of these 16 counties, the EAB quarantine now includes 37 Wisconsin counties. -- Krista Hamilton, DATCP Entomologist 
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