Although trees have deeper moisture-reaching roots than agricultural crops, it doesn't make them immune to prolonged drought, Purdue University urban forestry specialist Lindsey Purcell said.
"Drought can have a major impact on tree health and survival by effectively slowing and reducing growth," he said in a Purdue release Thursday.
"If drought is severe enough or lasts for a prolonged period of time -- such as what we're experiencing now -- it also can cause death to all or portions of a tree."
A more common effect of drought is to reduce a tree's ability to withstand insects and diseases, he said.
A water-deprived tree will see a significantly lowering of its energy reserves needed to produce chemicals that ward off pathogens, he said.