Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001644
11/12/99

Leaf Scorch Caused By High Temperature


Hot, dry summer weather can cause leaf scorch. The leaf
tissue on the edges (Vis. 1) and between the main leaf veins
dies. Eventually the entire leaf may be dead except for a
narrow band of live, green tissue along the veins. The tree
may be affected uniformly or on only one side or on just a
few branches. Plants growing near roads or in other
situations with much reflected heat and light are most
likely to be scorched.

Scorch can also be a symptom of insect and disease
problems that interrupt the flow of water from the roots.
Root diseases can reduce root efficiency so that less
water reaches the leaves, which then scorch. If you can
diagnose and stop the problem, you may be able to stop the
scorching.

Scorching related to high temperatures may be due to lack
of soil moisture or an inadequate root system. If dry
soil is the cause, watering may stop the scorching. If
the plant just does not have enough roots, it may scorch
during very hot, windy weather even though soil moisture
is adequate. Little can be done in this case.

Allowing the soil to dry excessively before watering can
kill the roots. Then when the plant is watered, the
reduced root system can not supply enough water to the
leaves.

Construction injury can cause compacted soil and root
removal or death that leads to scorching.


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