Scale crawler abundance monitored using sticky tape traps to determine the most effective time to make a foliar application of horticultural oil. Some professional managers enter their monitoring records into a computer database and summarize and analyze them using a graphical display such as this.

Graphical display of scale crawler density monitored with sticky tape traps on five untreated Chinese hackberry trees in Davis, California during 1991.; Davis, California Credit: Pests of Landscape Trees and Shrubs, Third Edition, ANR Publication 3359
Credit: Pests of Landscape Trees and Shrubs, Third Edition, ANR Publication 3359