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   Berries
 more...>Crops>Blueberries>Blueberry Insect Pests>Berries>

Cherry Fruitworm


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The cherry fruitworm (Grapholita packardi Zeller) feeds on a number of host plants including apple, cherry, blueberry, rose and hawthorn.

Facts:

  • Adults lay their eggs on both the fruit and foliage of blueberry plants.
  • Larvae hatch and bore into the first fruit encountered, often entering the calyx cup of the berry.
  • When larvae are about one-half to three-quarters grown, they move to an adjacent berry in the cluster, boring from one fruit to another at the point of contact and lining the junction with silk.
  • Some larvae attain their full size within the second fruit, while others may feed on additional berries.
  • After larvae develop into caterpillars, they leave the fruit and excavate small burrows in a dead blueberry cane, a pruning stub or the stem of a dead weed nearby.
  • Larvae remain inactive within these burrows for the remainder of the growing season and throughout the following winter.
  • With the onset of mild temperatures, the larvae pupate within their burrows and emerge as adults.
Damage:
  • Look for a pin-sized entry hole near the stem of any small berries that have begun to turn blue, and then open adjacent berries to find the reddish colored larva.
  • A premature color change in the fruit is often the only visible sign of an infestation.
Control:
  • In order to prevent damage by cherry fruitworms, two applications of a residual pesticide are usually needed during the adult's flight period in the spring.
  • Sprays applied against the cranberry fruitworm and plum curculio should also give adequate control of cherry fruitworms.
  • Check with your local Cooperative Extension Service office for control measures for your area.
Source:
Cline, Bill and Meyer, John R. 1997. Cherry Fruitworm. Blueberry Pest Management. Retrieved 02 September 2011.
Last Updated: 9/2/2011 3:30:47 PM

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