Flashcards in AC-Ch. 10 Diagnosis & Plant Disorders Deck (47)
Disorder or disease that occurs suddenly or over a short period of time
With oxygen. Process that occurs in the presence of oxygen
Chemical effect or inhibition of growth or development of plants that is induced by allelochemicals.
Without oxygen. Process that occurs in the absence of oxygen.
Disorder caused by an infectious living agent.
Any disease or disorder regardless of the causal agent that kills young plant tissues
Localized diseased area on stems, roots, and branches. Often shrunken and discolored
Whitish or yellowish leaf discoloration caused by lack of chlorophyll. Often caused by nutrient deficiency.
Disorder or disease occurring over a long period of time
Combination of factors contributing to the stress or decline of a tree
An area of wood that is undergoing decomposition
Decomposition of organic tissues by fungi or bacteria
Loss of leaves from a tree or other plant by biological or mechanical means.
Condition in which the branches in the tree crown die from the tips toward the center
Fecal material and/or wood shavings produced by insects
Vertical split in the wood of a tree generally near the base of the bole caused by internal stresses and low temperatures. Radial shake
Abnormal swelling of plant tissues caused by gall wasps, mites, nematodes, and various insects and less commonly by fungi or bacteria.
Exudation of sap or gum from the bark often in response to disease or insect damage
Sugary substance secreted by certain insects including aphids and some scale insects when feeding on plants.
Capable of being spread to plants from other plants or organisms
Irregularly shaped areas of disease on plant foliage
Patches of disease or other damage on plant foliage.
Localized death of tissue in a living organism.
Microscopic roundworm. Many are beneficial organisms but some feed on plant tissues and may cause disease or damage
Disorders that are not caused by a pathogen and cannot be passed from one host to another
Causal agent of disease. Usually refers to microorganisms.
In plants a disorder not directly caused by an insect, pathogen or injury
Plant malady caused by nonliving, environmental, or man-made agents
Any of various fungi of the genus Erysiphe that produce powdery conidia that appear as a white fuzzy coating on the upper leaf surfaces often causing distortion of the leaf.
Disease caused by a certain group of fungi and characterized by reddish brown spots on the foliage and/or the formation of stem galls.
Browning and shriveling of foliage, especially at the leave margin.
Physical evidence of a casual agent
Leaf-feeding damage caused by insects, characterized by the loss of tissue between the leaf veins.
Fungus that appears as a black coating on the surface of leaves, fruits, branches, and other surfaces. Often found growing on sugary honey dew excreted by aphids.
Growth reduction of organisms, specifically plants or plant parts.
Plant reaction to a disease or disorder.
Substance that moves throughout an organism after it is absorbed
Any condition, disease, disorder, or pest that affects the entire organism.
Factor that negatively affects the health of a plant; a factor that stimulates a response
Transition zone from trunk to roots where the trunk expands into the buttress or structural roots.
Darkening of the vascular tissues of woody plants in response to disease
In pathology, biotic or abiotic agent that transmits a pathogen.
In mechanics or rigging, quantity that has both magnitude and direction.
Loss of turgor and subsequent drooping of leaves and young stems; a symptom.
Infectious disease caused by a particular agent on a particular host or range of hosts.
To lose turgor.