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Looking Ahead
Volume 58 Number 16 Date 08/22/2013 CORN EARWORM - Migrants continue to arrive in the state. Counts during the past week ranged from 2-272 per trap, with the highest number of moths registered in the Byron area of Fond du Lac County. The latest activity suggests that scouting and control programs in sweet corn should be maintained until harvest. WESTERN BEAN CUTWORM - Moth numbers have decreased to very low levels, signaling the end of the adult flight. The cumulative state count as of August 21 was 642 moths in 116 pheromone traps. Individual counts from the 2013 trapping survey are provided in the CORN section. Monitoring network participants may remove their traps at this time. CORN ROOTWORM - Preliminary results of the annual beetle survey show populations are comparable to or slightly lower than last year in the southern and central crop reporting districts. District averages thus far range from 0.2 beetle per plant in the central region to 0.8 per plant in the southeast and are similar to averages of 0.5-0.9 per plant in the same areas in 2012. The state average in 156 fields surveyed as of August 21 is 0.5 beetle per plant. A count of 0.75 or more beetles per plant in continuous corn indicates a heightened risk of root damage to non-Bt corn next season. EUROPEAN CORN BORER - The treatment window for second generation larvae is expected to close next week in southwest, south-central and west-central Wisconsin. Management decisions must be made in the immediate future, before the caterpillars have bored into corn stalks and ears. STRAWBERRY ROOT WEEVIL - Large numbers of these black beetles are reportedly entering homes in scattered locations in southern and western Wisconsin. Although they are considered a nuisance by homeowners, the weevils are not damaging to the structure and do not breed indoors. -- Krista Hamilton, DATCP Entomologist 
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