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

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Presentation on theme: "Western corn rootworm  Eggs hatch mid- to late-May  Small larvae prune root hairs  Large larvae tunnel roots  Heavy feeding will reduce root mass "— Presentation transcript:

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 Excellent YieldGard RW YieldGard Plus MON863Fair-Good YieldGard VT Rootworm/RR2 YieldGard VT Triple Genuity VT Triple PRO MON88017Excellent Genuity SmartStaxMON DAS Excellent Source: IPM Corn Insect, Disease, Nematode and Weed Control Recommendations for 2010 Alabama Cooperative Extension Center


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