Kansas State University has a detailed article titled “Pine Diseases in Kansas:
Tip Blight, Dothistroma Needle Blight, and Pine Wilt”. This article is full of great information on how to identify the problem and then how to treat each problem. Its a pdf file and you can save it  your computer. I added the article to the Pines Bonsai page under Conifers Bonsai and Bonsai Tree Information page. It was also added to the Deseases/Insects page under Bonsai Basics page.