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Corn
Volume 58 Number 13 Date 08/01/2013 WESTERN BEAN CUTWORM - Moth activity has peaked or is expected to peak soon in most areas of the state. As of August 1, the Wisconsin network of 114 pheromone traps has reported a cumulative total of only 364 moths, the lowest preliminary state moth count since trapping surveys for this pest began in 2005. High counts in the past week were 33 moths in the black light trap near Sparta and 18 moths in the Merrimac pheromone trap. The map below shows the cumulative moth counts to date. CORN ROOTWORM - Numbers have been gradually increasing since emergence began last month. Surveys in the south-central and southwest areas found counts of 0.1-3.4 beetles per plant, with economic counts of one or more beetles per plant observed in a few cornfields in Green, Lafayette and Rock counties. Peak beetle emergence remains approximately 1-2 weeks away. EUROPEAN CORN BORER - Surveys of corn in Dane, Green, Jefferson, Lafayette and Rock counties found no significant infestations. Development of this insect has slowed in response to the cool weather of the past two weeks and the second flight could be prolonged if chilly nightly conditions continue. The treatment window for the second generation has opened in all areas where 1,550 degree days (base 50°F) have accumulated and will remain open until 2,100 degree days are surpassed. -- Krista Hamilton, DATCP Entomologist 
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