Cherry Fruitworm

9/2/2011 10:47:47 PM

Cherry fruitworm larval stage. Image provided by Bill Cline.

Cherry fruitworm adult stage. Image provided by Bill Cline.

Cherry fruitworm damage on blueberries. Image provided by Bill Cline.

Return to Blueberry Insect Pest Guide

Return to Blueberry Insect Pests Home Page

Click on the links above to return to the Blueberry Insect Pest Guide home page or the Blueberry Insect Pests home page.

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


  • 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.
  • 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.
  • 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.
Cline, Bill and Meyer, John R. 1997. Cherry Fruitworm. Blueberry Pest Management. Retrieved 02 September 2011.
Rate This Article:

Have a question or comment about the information on this page?

Innovate . Educate . Improve Lives

The LSU AgCenter and the LSU College of Agriculture