Trees and Ornamentals
Brown-spot needle blight, caused by Scirrhia acicola (Dearn.) Siggers, delays growth and causes mortality of longleaf pine (Pinus palustris Mill.). Brown spot reduces total annual growth of southern pines by more than 16 million cubic feet (0.453 million cubic meters) of timber. Damage is most severe on longleaf seedlings in the grass stage; i.e., those that have not begun active height growth (fig.1). Heavily infected seedlings may remain in the grass stage for 10 or more years.
Brown spot has also become a serious problem to certain varieties of Scots pine (P. sylvestris L.) and other pines grown in Christmas tree plantations in the north- and mid-central States (see photo) Thousands of dollars are lost annually by Christmas tree growers because this fungus causes needle drop, making trees unmerchantable.Brown blight is a disease that occurs on perennial ryegrass during cool, wet, and cloudy periods in the spring or fall. Brown blight is a "Helminthosporium"™ disease, which is a complex of diseases caused by fungi that produce large, cigar-shaped spores. Symptoms of brown blight initially appear as small, brown, round or oval spots on the perennial ryegrass leaves. As the disease progresses, the lesions expand and become more numerous, causing a brown or yellowish brown dieback of entire leaves or plants. This foliar blight stage appears in irregular patterns, although certain "hot spots"™ may be more severely damaged than others.
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