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A disorder or disease occurring or recurring over a very long time, typically multiple growing seasons.
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A sugary substance excreted by certain insects, including aphids and some scales, when feeding on plants.
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Pathogens or other pests that do not usually attack or infect healthy plants but tend to attack stressed plants.
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A small, often microscopic, unsegmented roundworm. Many are beneficial organisms, but some feed on plant tissues to cause disease or spread viruses.
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A factor that affects the health or condition of a tree.
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Disorders that are not caused by a pathogen and cannot be passed from one host to another.
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The transition zone from trunk to roots where the trunk expands into the buttress or structural roots.
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Capable of being spread from plants to result in infection of other plants or organisms.
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The influence, usually detrimental, of one plant on another, by the release of chemical substances.
is best defined as:

Exploitation
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Defoliation
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Allelochemicals
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Allelopathy
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An organism (including, but not limited to, weeds, insects, bacteria, or fungi)that is damaging, noxious, or a nuisance.

Pest
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Pathogen
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Parasite
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Predator
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A conceptual model showing three factors required for plant disease -a susceptible host, a pathogen or an abiotic agent, and a conducive environment.
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An exudation of sap, gum, or resin, often in response to disease or insect damage.
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Disorders that are not caused by a pathogen and cannot be passed from one host to another.
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A darkening of the xylem or phloem of woody plants in response to disease, insect boring, or injury.
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An abnormal condition that impairs the performance of one or more vital functions. Often associated with noninfectious agents or abiotic factors.

Acute
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Canker
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Disorder
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Symptom
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(1) When referring to a substance - moving throughout an organism after absorption. (2) When referring to a condition, disease, disorder, or pest - affecting the entire organism.
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A fungus that appears as a black coating on the surface of leaves, branches, fruits, and other surfaces (including those of buildings), resulting from deposits of sugary excrement from aphids and scale insects.
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A root that encircles all or part of the tree trunk or the tree's other roots, constricting the vascular tissue and inhibiting secondary growth and the movement of water and photosynthates.
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A sugary substance excreted by certain insects, including aphids and some scales, when feeding on plants.
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A group of mites in the family Eriophyidae. Typically smaller than other mites, requiring higher magnification to see and often inducing the development of leaf galls.

Anaerobic
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Nematode
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Eriophyid Mites
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Centipedes
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Pathogen
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Symptom
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Disorder
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Sign
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The physical evidence of a causal agent (e.g., insect eggs, borer hole, frass, mycelium, fruiting body).

Symptom
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Pathogen
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Sign
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Disorder
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Systemic
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Aerobic
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Decay
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Chronic
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Without or with a restricted supply of air. The process that occurs in the absence of oxygen.
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An exudation of sap, gum, or resin, often in response to disease or insect damage.
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A condition in which the branches in a tree die from the tips toward the main stem.
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A whitish or yellowish leaf discoloration caused by a lack of chlorophyll.Often caused by nutrient deficiency.
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A conceptual model showing three factors required for plant disease - a susceptible host, a pathogen or an abiotic agent, and a conducive environment.

Tree Stress
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Plant Disease Triangle
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Chronic
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Noninfectious
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Capable of being spread from plants to result in infection of other plants or organisms.

Infectious
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Acute
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Contagious
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Chronic
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A fungus that appears as a black coating on the surface of leaves, branches, fruits, and other surfaces (including those of buildings), resulting from deposits of sugary excrement from aphids and scale insects.
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(1) When referring to a substance - moving throughout an organism after absorption. (2) When referring to a condition, disease, disorder, or pest - affecting the entire organism.
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An abnormal condition that impairs the performance of one or more vital functions. Often associated with noninfectious agents or abiotic factors.
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(1) In pathology, a biotic or abiotic agent that transmits a pathogen. (2)In mechanics or rigging, a quantity that has both magnitude and direction (e.g., force).
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The browning and shriveling of foliage, especially at the leaf margin.
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An irregularly shaped necrotic area on leaf stem or fruit.
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The causal agent of disease. Usually refers to microorganisms.
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A condition in which the branches in a tree die from the tips toward the main stem.
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A small, often microscopic, unsegmented roundworm. Many are beneficial organisms, but some feed on plant tissues to cause disease or spread viruses.

Nematode
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Cestode
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Vector
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Pathogen
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The influence, usually detrimental, of one plant on another, by the release of chemical substances.
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The transition zone from trunk to roots where the trunk expands into the buttress or structural roots.
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Pathogens or other pests that do not usually attack or infect healthy plants but tend to attack stressed plants.
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Disorders that are not caused by a pathogen and cannot be passed from one host to another.
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A plant disorder characterized by a shortening of the internodes and a proliferation of terminal shoots forming a dense, brushlike mass of twigs.
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One of a number of separate plants of certain obligate pathogens(e.g., rust fungi) or insects (e.g., adelgids) on which successive life stages develop.
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A small, often microscopic, unsegmented roundworm. Many are beneficial organisms, but some feed on plant tissues to cause disease or spread viruses.
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The loss of leaves from a tree or other plant by biological, chemical, or mechanical means (as opposed to natural shedding).
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Without or with a restricted supply of air. The process that occurs in the absence of oxygen.
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A whitish or yellowish leaf discoloration caused by lack of chlorophyll.Often caused by nutrient deficiency.
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Pathogens or other pests that do not usually attack or infect healthy plants but tend to attack stressed plants.
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A disorder or disease occurring or recurring over a very long time, typically multiple growing seasons.
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