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A Rapid and Efficient Method for Assessing Pathogenicity of Ustilago maydis on Maize and Teosinte Lines
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Risk Assessment and Area-Wide Crop Rotation to Keep Western Corn Rootworm below Damage Thresholds and Avoid

Lorenzo Furlan1, Francesca Chiarini1, Barbara Contiero2

  • 1Veneto Agricoltura, Agricultural Research Department, Viale dell'Università, 14, 35020 Legnaro, PD, Italy.

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|May 27, 2022
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Summary
This summary is machine-generated.

Crop rotation effectively manages Western corn rootworm (WCR) in maize. Both structural and flexible rotation systems kept WCR below damaging levels without insecticides.

Keywords:
IPMarea-wide strategiesdamage thresholdflexible crop rotationrisk factorsstructural crop rotation

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Area of Science:

  • Agricultural Entomology
  • Crop Protection

Background:

  • Western corn rootworm (WCR), *Diabrotica virgifera virgifera*, is a significant quarantine pest impacting maize production in Europe.
  • Effective integrated pest management (IPM) for WCR necessitates understanding crop damage risk factors and area-wide strategies like crop rotation.

Purpose of the Study:

  • To evaluate the effectiveness of different crop rotation regimes as best practices for managing WCR in maize.
  • To assess agronomic and cultural factors contributing to WCR damage risk in affected fields.

Main Methods:

  • A long-term survey in Italy and Croatia identified factors contributing to WCR damage risk.
  • Field research in Italy compared continuous maize monoculture with structural (1/3 years) and flexible crop rotation systems.
  • WCR beetle captures, root damage, larval densities, and plant damage (lodging) were monitored.

Main Results:

  • High WCR densities were identified as the primary contributor to maize crop damage risk.
  • Both structural and flexible crop rotation systems proved effective in maintaining WCR populations below damage thresholds.
  • Insecticide use was unnecessary in areas employing these rotation strategies.

Conclusions:

  • Crop rotation is a highly effective strategy for sustainable WCR management in maize.
  • Implementing structural or flexible rotation systems can significantly reduce WCR impact without chemical intervention.
  • Agronomic practices, specifically crop rotation, are crucial for area-wide WCR control.