This is a fairly big complex of Lepidopteran pests that can occur individually or combined, depending on the crop affected. The species Grapaholita packardi is widely known as the cherry fruitworm and often infests cherry orchards across Canada. The insect Acrobasis vaccinii is more known as the cranberry fruitworm and can be found on crops such as cranberry, blueberry and huckleberry. The species Orthosia hibisci is known as the speckled green fruitworm and can be found on a wide variety of plants such as apples, cherries and other tree species. Helicoverpa zea is broadly known as the tomato fruitworm, and can be found consuming the fruit and other diversity of crops including corn, cotton and eggplants.
The eggs of the fruitworm are about 0.8 mm in diameter and white in colour. The larvae are generally large in size (up to 4 cm) and are typically varying shades of green with whitish-yellow stripes. The adult moths are rather large in size and can vary greatly in colour.
Examine approximately 20 fruit clusters per tree on five trees per orchard. Look for larvae or signs of the presence of larvae on each tree. If there is an average of two or more larvae per tree or evidence of fresh feeding on the fruits, then an immediate treatment is recommended.