1. Western corn rootworm  Eggs hatch mid- to late-May  Small larvae prune root hairs  Large larvae tunnel roots  Heavy feeding will reduce root mass  Confined to corn after corn  Unlike Southern corn rootworm Southern corn rootworm Southern corn rootworm

2. Other Factors Affecting Abundance Moist Soil Reduced tillage High historical pest pressure High litter/mulch levels – Routine manure applications Rotation is the most useful management tactic for Western Corn Rootworm

3. Why Rotate From Corn? Adults lay eggs in soil during the summer/fall Larvae hatch mid- to late-May Must feed on corn to survive Pupate during June Adults eat silk, pollen and foliage, then mate

4. Alternatives to Rotation Relative Efficacy Trade NameChemical/rateS. Corn Rootworm W. Corn Rootworm Poncho 500clothianidin 0.5 mg ai/kernel ExcellentPoor Poncho 1250clothianidin 1.25 mg ai/kernel ExcellentFair Cruiser Extreme 500 thiamethoxam 0.5 mg ai/kernel ExcellentNot labeled Cruiser Extreme 1250 thiamethoxam 1.25 mg ai/kernel ExcellentPoor Source: IPM Corn Insect, Disease, Nematode and Weed Control Recommendations for 2010 Alabama Cooperative Extension Center

5. Alternatives to Rotation Relative Efficacy Trade NameEvent for Rootworm W. Corn Rootworm Agrisure RW Agrisure CB/LL/RW Agrisure 3000 GT MIR604Very good Herculex RW Herculex XTRA DAS-59122-7Excellent YieldGard RW YieldGard Plus MON863Fair-Good YieldGard VT Rootworm/RR2 YieldGard VT Triple Genuity VT Triple PRO MON88017Excellent Genuity SmartStaxMON88017 + DAS-59122-7 Excellent Source: IPM Corn Insect, Disease, Nematode and Weed Control Recommendations for 2010 Alabama Cooperative Extension Center