Term
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Definition
/Fungus and bacteria
//cool, moist conditions
///yellowing,wilting, and scorching of leaf spots, new growth, or whole plant |
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Term
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Definition
/Bacteria and fungus but usually fungus
///perfectly circular sunken lesions on all plant tissues that are brown to black |
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Term
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Definition
/Fungus
//occurs mainly in cereal grains
///exude a yellow sweet mucus
///then mycelium starts to form. Eventually black and purple sclerotiums form in seed heads |
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Term
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Definition
/Everything
///Unnatural growths
///Smooth, fuzzy, or spiky balls of any size and color |
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Term
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Definition
/Nutrient deficiency
//cultural conditions
///interveinal chlorosis esp. at new growth and branch tips. Prominent dark-green veins |
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Term
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Definition
/Fungus
//A white or black powder forms over all tissues |
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Term
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Definition
/Virus
///Patches on leaves become dark-green and raised with defined edges
///leaves wrinkle, wilting completely
///margins become yellow |
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Term
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Definition
/Nutrient deficiency
//cultural conditions
///Complete chlorosis, esp. older growth |
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Term
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Definition
/Nutrient deficiency
//cultural conditions
///margins become purple, esp. older growth
///veins also become purple
///some yellowing of leaf patches |
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Term
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Definition
/Nutrient deficiency
//cultural conditions
///yellowing, scorching of leaf margins, esp. older growth
///leaves all appear lighter green |
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Term
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Definition
/Fungus
//Warm and dry conditions
///white powder forms only on upper side of leaves |
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Term
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Definition
/Fungus and bacteria
//wet conditions, eg floods
///roots turn brown or black and appear soggy
///cortex of root pulls away easily |
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Term
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Definition
/fungus
///yellow-to-red powdery pustules appear on all tissues, esp. new growth
///plants wither and die back |
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Term
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Definition
/fungus and bacteria
///leaves wither and fall early
///irregular lesions appear on fruits |
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Term
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Definition
/Insect
//lack of air circulation eg overcrowding
///white to brown lesions appear that are
///-hard and shiny with defined edges
///-or soft, cottony white
///large circular scars appear |
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Term
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Definition
/Fungus
//wet conditions eg floods, esp. affects cereal grains
///white and black mycelium appear in culms and on stems near ground
///plants may lodge |
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Term
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Definition
/fungus
//esp. affects cereal grains
///large white blisters form on mature plants
///blisters burst, containing black powder spores |
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Term
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Definition
/fungus, bacteria, and viruses
///leaves lose turgidity and droop
///become dull, yellow, wilt, and then wither from base upward |
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