Elm tree with Dutch elm disease

Elm tree with Dutch elm disease

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This image is part of the feature Ten Amazing Beetle Facts
This image is part of the feature The Invaders - The 10 Worst Invasive Species


Caption: Trunk of an elm tree stricken by Dutch elm disease, showing tracks of a bark-boring beetle, a vector of the fungus, Ophiostoma ulmi, which is the causative agent of Dutch elm disease. The sticky conidia of the fungus adhere to the fertilised female beetles & are deposited under the bark where they germinate. 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, defoliatin & finally death.

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Keywords: beetle tracks on trunk of elm, botany, ceratocystis ulmi, disease, diseases, dutch elm disease, nature, ophiostoma ulmi, pathogens, pathology, plant, worst invasive alien species

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