Dutch elm disease

Dutch elm disease

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Caption: A condemned elm tree suffering from Dutch elm disease, its trunk marked with a white cross designating felling. Dutch elm disease is caused by a fungus, Ceratocystis ulmi, carried by a bark- boring beetle. The sticky conidia of the fungus adhere to fertilised female beetles and are deposited under the bark where germination occurs. Infection spreads rapidly, but is confined to the water conducting vessels of the tree. The symptoms of the disease are yellowing & browning of foliage followed by wilting, defoliation & finally death.

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Keywords: botany, ceratocystis ulmi, disease, diseases, fungus, nature, pathogens, pathology, plant, worst invasive alien species

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