Egg Hatch for Apple Pests Now Posted Weekly at Penn State Fruit Research and Extension Center Website

Posted: May 11, 2011

Beginning this month, graphs for percent egg hatch, or emergence, of apple pests are updated weekly at In addition, to the egg hatch graphs, you will find weekly data on insect capture in pheromone traps and photos of how to identify the insects in the traps. The information is updated every Friday. The models are specific for Biglerville and should be adjusted for your region.
Oriental fruit moth larvae

Oriental fruit moth larvae

Dr. Greg Krawczyk, Penn State FREC Entolomogist

The egg hatch graphs depict percent egg hatch at critical stages of six apple insect pests for Biglerville, PA, and are based on temperature-driven models of hatch or emergence derived from observations at Biglerville or literature references. The graphs can be used to determine the optimum times for scouting and application of control measures. For example, insects are often most susceptible to insecticides when they are newly hatched and before they begin to damage fruit.

The updates provide seven days of forecast output provided by SkyBit Inc. (Boalsburg, PA). For more information about these pests and their management, see the 2010-2011 Pennsylvania Tree Fruit Production Guide (TFPG).