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Leaf Scorch 
 USFS Missoula Montana Minnesota Department of Natural Resources
Archives,
Minnesota Department of Natural Resources, www.ipmimages.org  DESCRIPTION: Leaf margins and the area
between leaf veins yellows or darkens. As the condition
progresses, entire leaves may dry up, turn brown and become brittle.
Leaves sometimes wilt rapidly and may remain a
pale green color, even though dried out. Damage is usually more
pronounced on the upper, windward, or southern side of trees. Plants
may lose many leaves prematurely during late summer and exhibit
twig dieback. LIFE
CYCLE:None (Environmental) CONTROLS:
Maintain vigor through proper watering especially in July and August. Deep water the
entire area under the canopy, one and one-half to three times farther
than the branches. Sufficient moisture will help keep the trees
vigorous enough to withstand pest attacks, as well as help prevent
winter injury. Avoid frequent, light waterings, and watering only at
the base of the tree trunk. Mechanical: Avoid over-fertilization. In many parts of Montana, additional tree fertilizers are not needed, especially when planted in turf areas that receive fertilizers. Unless trees are showing symptoms of nutrient deficiency, such as chlorosis, stunted growth, or deformed foliage, refrain from fertilizing them unless soil tests indicate otherwise. |
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