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32 Cards in this Set
- Front
- Back
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What is a Symptom? |
plant (host) reaction indicates a disease |
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What is a Sign? |
direct observation of a pathogen indicates a disease |
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Name examples of a symptom |
canker, spot
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Name examples of a sign |
mycelium, ooze |
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Define Necrosis? |
Death of the affected tissues |
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Describe necrosis |
* General term to describe death of cells * Usually characterized by loss of colour (whitening), darkening, or discolouration * Usually eventually turns brown |
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Name what is wrong with this plant |
Necrosis |
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Name what is wrong with this plant |
Anthracnose (on watermelon) |
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What is anthracnose? |
A localized diseased area or wound, there are many variations |
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What is eyespot? |
A dark centre, light halo spot that looks like an eye |
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Name what is wrong in this picture |
(Sharp) eyespot (on wheat) |
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Name what is wrong in this picture |
Brown Spot (on tobacco) |
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What is brown spot? |
Starts as a small spot and grows outwards in concentric rings |
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What is the signs of bacterial leaf stripe? |
Lesions follow leaf veins, regular or irregular shaped |
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Name what is wrong with this plant |
Bacterial leaf stripe |
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Name what is wrong with this plant |
Halo Blight Canker (on bean) |
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Name what is wrong with this plant |
Canker lesion |
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What is a canker? |
Oily, wet, dark, or translucent lesion on green tissue |
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What is wrong with this plant |
Fireblight |
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What is fireblight? |
Rapid and extensive death of above-ground plant parts |
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What is wrong with this plant |
Fusarium |
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What is fusarium disease? |
This form of blight (an irregular, rapid collapse of plant tissue) occurs on seed heads |
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What is wrong with this plant? |
Sirococcus blight |
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What is sirococcus blight? |
Rapid collapse or change beginning at tip of leaves, progresses rapidly |
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What is wrong in this picture? |
Leaf scorch (caused by high pH) |
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What is leaf scorch? |
Any symptom that suggests the action of flame or fire on the affected part, often seen at the margins of leaves. Often a result of an environmental or chemical burn |
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What is wrong in this picture? |
Dieback (on red maple) |
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What is dieback? |
Progressive death of shoots, branches, and roots starting at the tip |
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What is giberella canker? |
A sharply defined necrotic (dead) area that is sunken. It usually occurs on stems, branches or twigs |
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What is wrong with the twigs in this picture? |
Giberella Canker |
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What is wrong with these beans? |
Rhizoctonia root root (on beans) |
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What is rhizoctonia root rot? |
Softening, discolouration, and disintegration of plant tissue - can occur on any plant parts |
