Cutworms

Various species of cutworms and armyworms are present in orchards throughout the season and abundance can vary from year to year. In the spring some cutworm larvae climb to feed on the buds and young shoots (e.g. spotted and variegated cutworms). Some of these same cutworm species will also damage fruit in late summer by creating shallow clean tunnels that they enlarge as the larvae grow. Cutworm larvae feed only at night and hide in the soil beneath the trees during the day. If only a few trees are affected, examine the upper 2-4 cm of soil for the cutworms and destroy any found. Alternatively control the larvae by spraying the ground around the base of the trees with Ambush or with Sevin. Apply the products in the evening for best results.

cutworm Mature larva of the varietaged cutworm, Peridroma saucia

Cutworm damage has become more common in high density plantings where bearing limbs often touch ground vegetation, making it easier for cutworms to attack fruit.

It is important not to mow the cover crop heavily infested with cutworms/armyworms because the mowing will drive them up into the trees. Try to keep bottom branches from touching the ground cover by tying them up or by keeping the ground cover mowed under the trees.

cutworm damage Variegated cutworm damage on apple

February 2004

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