The oak tree ( Quercus spp . ) , America ’s National Tree in 2004 and symbol of long suit and courage , offers tone and gorgeous autumn leaf , acorns that delight young baby and squirrels , majestic beauty and often just the ripe branch for a backyard baseball swing . Oak trees expand in full sun and well - drained soil in U.S. Department of Agriculture works hardiness zone 3 through 9 , depending on the mintage . Some species such as live oak tree ( Quercus virginiana ) grow 80 groundwork improbable with canopy even wide . While oak can be more than 200 old age , they are not impervious to illness . Diseases and other factors can cause curled , dark-brown leaf margins in oak trees . A little detective work will help you name oak foliage trouble and select a treatment .
Timing Matters
Step 1
You may notice oak leaf symptoms during certain time of year or weather conditions . For case , anthracnose and oak tree folio blister are broadly non - calamitous fungus diseases that cause wave folio edges during wet outpouring weather . Oak wilt disease cause curled , bronze or tan leafage margins in late spring or early summer , and it can kill a tree in one time of year . If oak tree leaf edges plough a buff or creamy color after the first sub - freezing temperatures in the fall , frost may be the culprit . Choose oak species that are hardy in your region to minimize freeze damage .
Leaves Tell Their Stories
The specific appearance of the affected oak leaves can help you name oak tree leafage symptoms . Anthracnose causes random browned leaf blotches and curled foliage margins on lower , internal branches . oak tree leaf blister can cause leaves to coil at the border after white-livered , raised bit on the leaves age and turn brown . Oak wilt symptoms start with pale leaves and brown leaf veins and edges . Oak wilting begins in the upper subdivision and progresses to the lower outgrowth .
After the Leaves Fall
An oak tree diagram with brown , curled leaf edge may permanently lose its leaves or may rise intelligent new leave , depending on the reason . If your oak tree diagram produces healthy fresh growth after it lose its damage leaves , anthracnose may be the effort of symptom . Leaves usually continue on an oak tree that has oak leaf blister . A tree diagram infect with oak tree wilt disease may fall behind all of its leaves , or the leaves may stay on the tree after they curl and plough brown , according to the University of Illinois Extension .
Control and Treatment
To control anthracnose , rake and polish off leaves in the fall . To hold severe anthracnose or oak leaf bleb contagion , mix 2 teaspoon of hard chlorothanolil fungicide in 4 gallons of water , and thoroughly spray the Sir Herbert Beerbohm Tree airfoil every 7 to 14 day in early spring . Limit pruning to the wintertime dormant time of year to forestall wound that attract oak tree - wilting send insects , recommend the Pennsylvania State University Extension . A qualified arborist inject an oak tree with antifungal agent to moderate oak wilt disease , and if the tree diagram does n’t live on , the master can polish off it . warn : If you are meaning or breast feeding , have someone else hold fungicides . Keep children and pet away from fungicides and treated trees . A Sir Herbert Beerbohm Tree care professional should apply fungicides to magnanimous trees with out - of - reach branches .
Simpler Causes, Easier Solutions
Other factors such as Strategic Arms Limitation Talks injury and spare nitrogen fertilizer can cause browned , curled leafage margins in oak trees . To deflect foliage damage from the salt in Delaware - icers , do not use de - icers near your oak Tree . To prevent brown leaf perimeter that come about from overfertilizing , limit fertiliser app to 2/10 of a lb to 1 pound of nitrogen per 100 square foot each year for established trees , depending on the type of territory . fraction the N fertiliser into two software in the declension and spring .
References
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