
1) Plant disease
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https://www.crosswordclues.com/clue/dieback

(arboriculture) a condition in trees or woody plants in which peripheral parts are killed, either by parasites or due to conditions such as acid rain.
Found on
http://en.wikipedia.org/wiki/Glossary_of_environmental_science

Progressive death of shoots, branches and roots generally starting at the tip.
Found on
http://ppathw3.cals.cornell.edu/glossary/Defs_D.htm

common symptom or name of disease, especially of woody plants, characterized by progressive death of twigs, branches, shoots, or roots, starting at ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/d/46

A process caused by disease or pests. It is the death of the tips of branches and shoots. It will progress until the whole plant dies.
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http://www.encyclo.co.uk/local/20077

General name for a significant decline in tree health and numbers, especially native trees; caused by a variety of agents, including insect attack, disease, pollution and human-induced changes to the environment.
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http://www.encyclo.co.uk/local/20453

The death of tips of shoots caused by damage or disease.
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http://www.encyclo.co.uk/local/21081

Signs of a lack of vigor in any tree. Causes are numerous and increasing. Much research is being done on Maple decline and its possible link to environmental factors.
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http://www.encyclo.co.uk/local/21355

The progressive death of branches or shoots beginning at the tips and moving toward the main stem.
Found on
http://www.rollitup.org/general-marijuana-growing/98008-glossary-terms.html

[
n] - a disease of plants characterized by the gradual dying of the young shoots starting at the tips and progressing to the larger branches
Found on
http://www.webdictionary.co.uk/definition.php?query=dieback
noun 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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https://www.encyclo.co.uk/local/20974

Decline that proceeds slowly from the tips of branches in towards the trunk.
Found on
https://www.encyclo.co.uk/local/21609

Decline that proceeds slowly from the tips of branches in towards the trunk.
Found on
https://www.encyclo.co.uk/local/22459

Death of living tissues, usually leaves and twigs first, that progress from the outside or top of the tree towards the interior or base.
Found on
https://www.encyclo.co.uk/local/22460

A process caused by disease or pests. It is the death of the tips of branches and shoots. It can progress until the whole plant dies.
Found on
https://www.encyclo.co.uk/local/22488

a condition in a plant in which the branches or shoots die from the tip inward, caused by any of several bacteria, fungi, or viruses or by certain environmental conditions.
Found on
https://www.infoplease.com/dictionary/dieback

Decay from the tip of a shoot towards the main stem or root of a plant
Found on
https://www.weasdale.com/Glossary-of-Terms
No exact match found.