Pitch Pine needle cast / Lophodermium

ALDEVAUX

Since pines are susceptible to several needle blights and casts that are caused by fungi that infect and kill (blight) the needles, causing them to be shed or cast prematurely, you should make sure that Lophodermium needle cast (caused by Lophodermium seditiosum) is really the one affecting your tree. This is because the disease cycle of each of the needle cast diseases is different making the timing of the fungicide application also different for each one of them.
For Lophodermium, spraying with fungicides is an effective and recommended form of control (only those fungicides that are currently registered for control of this disease in your area should be used).
Using a preventive fungicide such as Bordeaux mixture (copper), chlorothalonil or maneb, once every 2 to 3 weeks during the major infection period from late July through October can prevent infection on non affected needles only but will not cure those that are aleady infected.
Furthermore, to be effective, sprays must be applied before and during the peak sporulation period of the fungus. This varies with climate, and a pest specialist is sometimes needed for advice on timing of applications.
More than one application is usually needed if wet weather persists.
Best of luck.