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Communicable Diseases (Plant (Rose Black Spot (fungus) (fungal disease of…
Communicable Diseases
Plant
Rose Black Spot (fungus)
fungal disease of rose leaves, causes black spots to appear on leaves
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Fungicide can be used, and affected areas can be burned/destroyed to stop the spread
smaller flowers, important cause roses are only wanted for nice flowers
Insects, most notably aphids can destroy plants or spread disease as a vector. They have sharp mouthparts that penetrate into the phloem of the plant and steal the sugar-rich phloem sap. Their mouthparts can have pathogens from other plants and spread it to healthy plants. They can be dealt with chemical pesticides or biological pest control (in closed spaces)
Detecting disease
Symptoms include
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areas of decay or rotting (rose black spot, potato blight)
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discolouration (chlorosis caused by magnesium deficiency, or mosaic patterns from TMV)
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Some diseases can be treated, and treatment must start quickly, and for those that can't be treated, the diseased plants must be removed to stop the spread
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There are not many bacterial diseases for plants, but there's one that causes crown galls