Symptoms of drought injury to trees can be sudden or may take up to two years to appear. Drought injury symptoms on tree leaves include wilting, curling at the edges, and yellowing.
- Deciduous leaves may develop scorch, brown outside edges or browning between veins.
- Evergreen needles may turn yellow, red or purple.
- In continued drought, leaves may be smaller than normal, drop prematurely or remain attached to the tree even though brown.
- Often, drought stress may not kill a tree outright, but set it up for more serious secondary insect and disease infestations in following years.