dieback

n.
The gradual dying of plant shoots, starting at the tips, as a result of various diseases or climatic conditions.

A condition often found in woody plant material where browning and death of the plant cells begin from the tip inward and may continue as far as the woody or perennial part of the plant.

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The death of a plant's stems, beginning at the tips, caused by lack of water, nutrient deficiency, disease, frost damage, insect attack, or injury from pruning.

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The noun has one meaning:

Meaning #1: a disease of plants characterized by the gradual dying of the young shoots starting at the tips and progressing to the larger branches

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