What can be happening to the Austrian pines in my windscreen causing them to turn brown in large sections?

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What can be happening to the Austrian pines in my windscreen causing them to turn brown in large sections?

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From your description of the problem, your Austrian pines are probably victims of Sphaeropsis blight, a fungal disease which is often fatal to this species. This disease was formerly known as Diplodia tipblight. Control usually requires professional help; consult an arborist.

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