I think every time there is a lack of rain, the trees, regardless of type, wilt. Additionally, folks rarely fertilize, mineralize, or refresh the soils under and around their pine trees. I wonder if a good shot of bull, horse, sheep, chicken, or pig shrite would reduce these "outbreaks of disease" by revitalizing the trees own resistance systems with good ole fashioned soil augmentation. Just plant a politician under every pine tree and you will have enough bullshit for an entire forest in no time.