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    Farming & Crop Protection European corn borer

    European corn borer [Ostrinia nubilalis]

    The caterpillars are approx. 25-30 mm long, yellowish or reddish-brown in color, and have a dark dorsal line as well as a dark head capsule. The body has numerous black warts (Picture 1). The moths are approx. 12-15 mm long and yellowish-brown in color (Picture 2). The forewings have a span of up to approx. 30 mm and are marked with jagged transverse bands as well as spots.

    overview

    European corn borer - image 1

    European corn borer - image 1

    European corn borer - image 2

    European corn borer - image 3

    Pest Profile

    • Symptoms & Diagnosis

      Occurence

      Chiefly in maize, but also in other plant species such as potatoes and barnyard grass.

      Pattern of damage

      Stalks, tassels, or cobs are broken or bent over. Small boreholes surrounded by light-colored frass can be found below the breakage sites (Picture 3). The destructive caterpillars not only mine in the interior of the plants, but also leave distinct signs of feeding damage on cobs and kernels.

      Remarks

      The pest occurs chiefly in the warmer maize production regions.