dothistroma needle blight on austrian pine

(spores) are produced in fruiting structures within the spots or bands on the needles. Nearly to the base while others are less affected or unaffected.ĭothistroma pini is the non-sexual stage of the fungus and is the only stage found in Oklahoma. The browning of needle tips killed by Dothistroma is variable. Premature defoliation (especially of lower needles) often occurs with Dothistromaįigure 4. Turn red brown, while the needle bases remain green.įigure 3. As the symptoms of Dothistroma needle blight progress, the tips of the needles may On the needles that may have a water-soaked edge.įigure 2. In the fall, early symptoms of Dothistroma needle blight appear as spots or bands The amount of tip browningĬaused by Dothistroma needle blight is variable (Figure 4).įigure 1. Show browning of tips to roughly the same point on the needle. However, needles damaged by winter desiccation will Winter desiccation injury causes symptoms similar

Needles may be prematurely shed or cast from the tree, especially The dead portion of the needle may break off As the spots enlarge, the tips of the needles will die while the Early symptoms consist of yellow and tan spots that may be bordered by a water-soakedīand (Figure 1). Trees may be weakened and eventually killed.Īlthough needles are infected in the spring, the symptoms do not develop until theįall.

When Dothistroma needle blight is left uncontrolled, sylvestris) pine is resistant to this disease. ponderosa) pines are highly susceptible while Scots or Scotch ( P. The disease affects both landscape plantings and pines in windbreaks.Īustrian ( Pinus nigra) and ponderosa ( P. Dothistroma needle blight is a serious disease of pine trees in Oklahoma that causes

Dothistroma needle blight on austrian pine