Caterpillar - Dark brown larvae up to 12 mm long with upturned spines on its tail.Colour - Dark brown
Damage signsPlant stems are chewed at ground level, weakening or killing plants.
Origin and History:Distribution:
Management and Control:Bronze Field Beetle has a larval stage that is also called the false wireworm. It tends to feed on the surface whereas the Vegetable Beetle False Wireworm tends to feed below the soil surface. The False Wireworm of the Bronze Field Beetle appears to be more difficult to control and rates of 300 mL/ha of Dominex or Fastac are required. They appear to build up in zero till and stubble retention crop systems especially on header or swath rows and can be very damaging to Lupins and Canola. Raking and/or burning the stubble provides high levels of control. In trials, raking the stubble has reduced numbers of adults by 99.9% compared to 95% control with 2 sprays after planting. Cosmos as a seed dressing and to a lesser extent Confidor have shown promise in trial work (P. Michael, 1999).
Thresholds:Young Canola - probably around 50 per square metre for Grey False Wireworm and 25 per square metre for Large False Wireworm.
Related Species:Vegetable Beetle or False wireworm.
Acknowledgments:Collated by HerbiGuide. Phone 08 98444064 for more information.