Tree diagnosis Flashcards
Growth reduction of organisms specifically plants
Stunting
Leaf feeding damage caused by insects characterized by the loss of tissue between the leaf veins
Skeletonized
A chemical effect or inhibition of growth or development of plants that is induced by allelochemicals
Allelopathy
Area of wood that is undergoing decomposition (bacteria or fungi)
Decay
Process that occurs in the presence of oxygen
Aerobic
A localized diseased area on stems, roots and branches . Often shrunken and discolored
Canker
The causal agent of disease usually microrganisms
Pathogen
Disorders that are not caused by a pathogen and cannot be passed from one host to another
Non infectious
Any disease or disorder that kills young plant tissues
Blight
A loss of leaves from a tree or other plant by biological or mechanical means
Defoliation
A whitish or yellowish leaf discoloration caused by lack of chlorophyll. Often cause by nutrient deficiencies
Chlorosis
An irregullarly shaped area of disease on plant foilage
Leaf blotch
In plants, a disorder not directly caused by an insect, pathogen or injury
Physiocological disorder
A browning and shriveling of foilage especially on the leaf margin
Scortch
A plant reaction to a disease or disorder (eg wilting(.contrast with sign
Symptom
In pathology, biotic or abiotic agent that transmits a pathogen
Vector
A disease caused by a certain group of fungi and characterized by reddish brown spots on the foilage and or the formation of stem galls
Rust
Patches of disease or other damage on plant foilage
Leaf spot
A microscopic roundworm. Some beneficial some cause damage
Nematode
Physical evidence of causal agent (eg borer hole, frass) contast w symptom
Sign
Any various fungi of the genus erysiphe that produce powdert conidia that appear as white, fuzzy coating on the upper leaf surfaces often causing distortion of the leaf
Powdery mildew
A darkening of the vascular tissues of woody plants in response to disease
Vascular discoloration
Substance that moves throughout organismadter it is absorbed, any disease or pest that affects entire organism
Systematic
Capable of being spread to plants by other plants
Infectious
A combination of factors contributing to the stress or decline of a tree
Complex
A disorder or disease that occurs suddenly over a short period of time. Contras w chronic
Acute
A localized death of tissue in a living organism
Necrosis
A disorder caused by an infectious living agent
Biotic disorder
A disorder or disease occurring over a long period of time. Contrast w acute
Chronic
A fungus that appears as a black coating on the surface of leaves, fruits and other surfaces. Often found on sugary honeydew excreted by aphids
Sooty mold
A transition zone from trunk to roots where the trunk expands. Root flare
Trunk flare
A vertical split in the wood of a tree near the base of the bole caused by internal stress and low temperatures. Radial shake
Frost crack
An abnormal swelling of plant tissues caused by gall wasps, mites nematodes and less commonly fungi or bacteria
Gall
A plant disorder characterized by a shortening of the internodes and a proliferation of terminal shoots forming a dense brashlike mass of twigs
Witchs broom
- Loss of turgor and subsequent drooping
2. Infectious disease that causes host to lose turgor
Wilt
A condition in which the branches in the tree crown die from the tips toward the center
Dieback
