European Corn Borer Early Warning System &
Growing Degree Days -
http://psu.zedxinc.com/cgi-bin/site.cgi?location=2&user=psu#

This website provides a map of the predicted lead European corn borer life stage for all locations in Pennsylvania. The intent of this information is to help pest management specialists and consultants anticipate key life stages to put out pheromone and blacklight traps and scout for the pest. Each prediction is for a 10 square kilometer grid in the state, so there can be subtle climatic differences within each grid. The model uses real time temperature information to calculate degree days and determine which life stage the population should be entering at a location. It also uses projected temperature to give a 1, 3, 5, and 7 day forecast. The model is assigning a life stage base on the most advanced life stage of the population that contains at least 5% of the population. Each life stage and generation is represented by a specific color on the map, which is shown in the accompanying key.

Alfalfa Weevil Life Stage Predictions &
Growing Degree Days -
http://psu.zedxinc.com/cgi-bin/site.cgi?location=2&user=psu#

This map provides information on the most advanced life stage that is predicted for a given geographic location in the state. The model predicts when at least 50% of the population should have attained this stage of development. Therefore, sampling may reveal a few more advanced life stages and a few less developed individuals, but the majority should be in the predicted stage of development. This model provides a prediction for the population resulting from eggs laid by the overwintering adults. Larval stages for the population that resulted from eggs laid in the fall, that hatch early, are not predicted by this model. The eggs of overwintering adults are typically 80 to 90% of the total spring population and much more important to control. Users of this information should watch to see when the population is entering the 3rd instar. This is when the rate of feeding and injury increases greatly and control should be targeted.

Western Corn Rootworm Life Stages:
http://psu.zedxinc.com/cgi-bin/site.cgi?location=2&user=psu#

This site provides information on the life stages of western corn rootworm predicted for a given geographic location. These maps show when at least 5% of the population has entered the most advanced life stage. Events in the life cycle of the northern corn rootworm population occurs slightly later (typically a few days). The key events to watch are the predicted period of egg hatch relative to crop growth. A post-emergence insecticide application should be timed to the window of one week before or after 5% egg hatch (entrance into the first instar). Entrance into the 3rd instar should provide information on when to expect to see stalk lodging in fields with heavy injury. Entrance into the adult stage can be used as a guide to begin scouting fields. Note: The 380 DD requirement for western corn rootworm hatch listed in the "Field Crop Newsletter" is for 50% egg hatch not 5%.