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Corn
Volume 58 Number 1 Date 05/02/2013 BLACK CUTWORM - Moths arrived in the state three weeks ago, first appearing near Janesville in Rock County on April 15. Counts since then have been low and no significant migration has been noted. The 2013 monitoring network consisting of 30 traps in Columbia, Dane, Dodge, Grant, Iowa, Jefferson, Lafayette, Monroe and Rock counties and has thus far registered a cumulative total of 76 moths. Projected corn cutting dates will be determined once the first sustained capture of nine or more moths in two nights is documented. SEEDCORN MAGGOT - Corn establishment problems due to this soil pest are probable for some areas of the state this spring if cool, wet weather persists. Outbreaks of seedcorn maggot are occasional but occur in years when seed germination and emergence are delayed by low temperatures and wet soils, allowing the subterranean maggots to feed longer. Failure of seedlings to emerge is usually the first sign of maggot infestation. CORN ROOTWORM - Results of the annual beetle survey conducted last August indicate a high potential for larval root injury to corn in southern Wisconsin in 2013. More than a quarter of the 229 corn fields sampled last year had counts that met the treatment criteria of 0.75 beetle per plant, many of which were distributed in the southern three crop reporting districts. Beetle counts in the northern districts increased markedly from 2011 levels but were still below average, so fewer problems are anticipated those areas. -- Krista Hamilton, DATCP Entomologist 
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