松褐斑病是 Scirrhia acicola 引起的。这种病害是美国南部长叶松幼树上最重要的病害之一。病害能引起落叶、降低植株的生长力,常常造成树木的枯死。若连续多次落叶,使幼树生活力减退,有时延续到长叶松的整个生长阶段,并可抑制和妨碍初期高生长。在历史上,苗圃播种床上的苗木和果园里的幼树 Pine leaf spot is caused by Scirrhia acicola. The disease is one of the most important diseases on savannah trees in southern United States. Diseases can cause deciduous leaves, reducing plant growth, often causing trees to die. If leaves decay many times, so that the sapling diminished vitality, and sometimes continue until the entire growth stage of gynostemma, and can inhibit and hinder the initial high growth. Historically, nurseries sow seedlings in beds and young trees in orchards