AC-Ch. 10 Diagnosis & Plant Disorders Flashcards Preview

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Flashcards in AC-Ch. 10 Diagnosis & Plant Disorders Deck (47)
1

Disorder or disease that occurs suddenly or over a short period of time

Acute

2

With oxygen. Process that occurs in the presence of oxygen

Aerobic

3

Chemical effect or inhibition of growth or development of plants that is induced by allelochemicals.

Allelopathy

4

Without oxygen. Process that occurs in the absence of oxygen.

Anaerobic

5

Disorder caused by an infectious living agent.

Biotic disorder

6

Any disease or disorder regardless of the causal agent that kills young plant tissues

Blight

7

Localized diseased area on stems, roots, and branches. Often shrunken and discolored

Canker

8

Whitish or yellowish leaf discoloration caused by lack of chlorophyll. Often caused by nutrient deficiency.

Chlorosis

9

Disorder or disease occurring over a long period of time

Chronic

10

Combination of factors contributing to the stress or decline of a tree

Complex

11

An area of wood that is undergoing decomposition

Decay

12

Decomposition of organic tissues by fungi or bacteria

Decay

13

Loss of leaves from a tree or other plant by biological or mechanical means.

Defoliation

14

Condition in which the branches in the tree crown die from the tips toward the center

Dieback

15

Fecal material and/or wood shavings produced by insects

Frass

16

Vertical split in the wood of a tree generally near the base of the bole caused by internal stresses and low temperatures. Radial shake

Frost crack

17

Abnormal swelling of plant tissues caused by gall wasps, mites, nematodes, and various insects and less commonly by fungi or bacteria.

Gall

18

Exudation of sap or gum from the bark often in response to disease or insect damage

Gummosis

19

Sugary substance secreted by certain insects including aphids and some scale insects when feeding on plants.

Honeydew

20

Capable of being spread to plants from other plants or organisms

Infectious

21

Irregularly shaped areas of disease on plant foliage

Leaf blotch

22

Patches of disease or other damage on plant foliage.

Leaf spot

23

Localized death of tissue in a living organism.

Necrosis

24

Microscopic roundworm. Many are beneficial organisms but some feed on plant tissues and may cause disease or damage

Nematode

25

Disorders that are not caused by a pathogen and cannot be passed from one host to another

Noninfectious

26

Causal agent of disease. Usually refers to microorganisms.

Pathogen

27

In plants a disorder not directly caused by an insect, pathogen or injury

Physiological disorder

28

Plant malady caused by nonliving, environmental, or man-made agents

Abiotic disorder

29

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.

Powdery mildew

30

Disease caused by a certain group of fungi and characterized by reddish brown spots on the foliage and/or the formation of stem galls.

Rust

31

Browning and shriveling of foliage, especially at the leave margin.

Scorch

32

Physical evidence of a casual agent

Sign

33

Leaf-feeding damage caused by insects, characterized by the loss of tissue between the leaf veins.

Skeletonized

34

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.

Sooty mold

35

Growth reduction of organisms, specifically plants or plant parts.

Stunting

36

Plant reaction to a disease or disorder.

Symptom

37

Substance that moves throughout an organism after it is absorbed

Systemic

38

Any condition, disease, disorder, or pest that affects the entire organism.

Systemic

39

Factor that negatively affects the health of a plant; a factor that stimulates a response

Tree stress

40

Transition zone from trunk to roots where the trunk expands into the buttress or structural roots.

Trunk flare

41

Darkening of the vascular tissues of woody plants in response to disease

Vascular discoloration

42

In pathology, biotic or abiotic agent that transmits a pathogen.

Vector

43

In mechanics or rigging, quantity that has both magnitude and direction.

Vector

44

Loss of turgor and subsequent drooping of leaves and young stems; a symptom.

Wilt

45

Infectious disease caused by a particular agent on a particular host or range of hosts.

Wilt

46

To lose turgor.

Wilt

47

Plant disorder characterized by a shortening of the internodes And a proliferation of terminal shoots forming a dense, brush like mass of twigs.

Witch's broom