lausige Ulmen in Amsterdam

 

Noch immer gilt die Ulme als Risikoart, die man als Planer und Landschaftsarchitekt lieber nicht pflanzt. Grund dafür ist das Ulmensterben oder die Ulmenwelke, die der Schlauchpilz Ophiostoma novo-ulmi verursacht.  Bremsen lies sich der vollständige Verlust von Flatter-, Feld- und Bergulme nur durch konsequentes Fällen großer (kranker) Bestände. Der jahrzehntelange Verzicht von Neuanpflanzungen half, eine weitere Ausbreitung zu verhindern. Die Ulmenstadt Amsterdam konnte ihre Ulmen dank regelmäßiger strengen Baumkontrollen erhalten – laut eines faz-Berichts etwa 75000 Ulmen!

Nur wie schaut es jetzt aus? Kleine Pflanzgruben, verdichteter Boden und Trockenheitsstress machen den Ulmen Amsterdams zu schaffen.

Bereits im Mai diesen Jahres litten sie stark unter Läusen und hatten nur wenig Laub – ein klares Indiz, dass sie so vorzeitig altern, brüchig werden und vorschnell absterben. Schade, wie sorglos und wenig achtsam die Grachtenalleen gepflegt werden. Mit Gießen alleine ist es sicher nicht getan – vielmehr braucht es ein Konzept zum Schutz der Baumscheiben und Pflanzgruben, das sich in Stadt- und Straßenbild integriert.

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