Iris Borer


Iris Borer

Iris Borer

Das Insekt überwintert auf alten Blättern oder Trümmern als Eier. Die Eier schlüpfen im Frühling, wenn die Blätter ungefähr 6 Zoll groß sind. Die jungen Larven graben sich in die Blätter. Die und schließlich Bohrungen in die Rhizome. Das Insekt verpuppt sich im Boden oder in den Rhizomen und die adulte Motte taucht im Spätsommer auf, um Eier zu legen.

Eines der am meisten sichtbaren Symptome ist ein schlechtes Wachstum. Das Insekt führt jedoch oft zu bakterieller Moderfäule, die eine übel riechende Fäulnis verursacht.

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Iris Borer

FAQ - 💬

❓ How do you treat root rot in iris?

👉 Remove and destroy rotting or rotted plants, their bulbs or rhizomes and, ideally, the soil up to six inches beyond the problem area. If you opt to treat with a fungicide, the area should be drenched when the plants are removed, again at planting time and once more when the irises start to show new growth.

❓ How do you treat iris rhizomes?

👉 Place in a dark, dry, and warm location with good air circulation – the ideal temperature for curing is around 65 to 70°F. Cure for two weeks, then coat with powdered garden sulfur or another antifungal agent to prevent disease, infestation, and rot. Bonide Sulfur Plant Fungicide is available at Arbico Organics.

❓ What causes iris rhizomes to rot?

👉 Iris root rot is a caused by Erwinia carotovora, a bacterial phytopathogen. It usually gets inside the rhizome through an opening created by some kind of injury. Any pest could provide this entry, including borers, slugs, snails, beetle larvae or even rough use of tools.

❓ Are iris cut and come again?

👉 While you can cut back iris leaves and stems after they have bloomed, it is recommended to leave the foliage on the plant until mid-fall to allow the plant to regain its energy to survive the winter and rebloom the following year.

❓ How do I get rid of iris borers?

👉 A well-timed pesticide application can help reduce an iris borer infestation. Two options are acephate or spinosad. It is important to apply the pesticide when eggs are just hatching. The leaves should be about four to six inches high at this time.

❓ How do you save dying iris?

👉 Revitalizing your Irises involves digging them up, removing the dead or diseased rhizomes and then replanting them. You'll need a shovel and a sharp knife to properly perform these tasks.

❓ How do you stop iris borers?

👉 Remove and destroy (e.g. burning or burying) old iris leaves, stems and any nearby plant debris. This will remove and kill eggs, and reduce the risk of iris borers next year. Clean up iris beds anytime after a hard frost (when female moths are no longer laying eggs).

❓ Is Epsom salt good for irises?

👉 Is Epsom salt good for irises? Epsom salt is only good for irises if they have a magnesium deficiency. 'Unless magnesium is deficient (shown by inter-veinal yellowing of older leaves) there is no need to add magnesium as Epsom salts.

❓ What does iris borer damage look like?

👉 Iris borers symptoms are first noticed in April or May as they tunnel into the leaves. The leaves become ragged and dark streaked. The leaves will also leak a fluid. These symptoms also mimic bacterial soft rot, leaf spot, and iris scorch, all common iris diseases.

❓ What month do you cut back irises?

👉 In mid summer, when the plants begin to look ratty, cut all the foliage down by half to create “fans” of leaves. Always cut at an angle. At the end of the growing season, after the leaves have been killed by a few fall frosts, completely remove all foliage. Most of iris diseases overwinter on the leaf debris.

❓ How do you get rid of borers naturally?

👉 A natural deterrent for borers is garlic. Simply plant cloves of garlic around your fruit trees, which will help prevent visits from the adult borer beetles.

❓ What is the iris borer and what causes it?

👉 The iris borer is a serious pest of bearded irises. The mature stage of the iris borer is a grayish moth. Female moths lay eggs on iris foliage and other nearby plants in late summer/early fall. The eggs hatch the following spring. The small larvae (caterpillars) bore their way into the iris foliage and feed on leaf tissue.

❓ Where do Iris borer moths lay their eggs?

👉 Iris borer (Macronoctua onusta) moths lay their eggs on the foliage of irises in late summer and early fall. 1  The eggs overwinter on old foliage and emerge in the spring as tiny caterpillars that tunnel into the newly emerging foliage. Throughout the summer, they tunnel their way down to the rhizome, growing to about two inches long.

❓ What are the tiny moths on my Iris leaves?

👉 Iris borer (Macronoctua onusta) moths lay their eggs on the foliage of irises in late summer and early fall. The eggs overwinter on old foliage and emerge in the spring as tiny caterpillars that tunnel into the newly emerging foliage. Throughout the summer, they tunnel their way down to the rhizome, growing to about two inches long.

❓ Why are my irises rotting on the inside?

👉 The rotting is caused by soft rot bacteria that colonize the iris borer feeding areas. The unpleasant odor is caused by other bacteria that subsequently colonize the decayed tissue. Bearded iris is the type of iris most severely affected by iris borer. Siberian and dwarf iris typically have few problems with this insect.


Autor Des Artikels: Alexander Schulz. Unabhängiger Konstrukteur und technischer Experte. Arbeitserfahrung in der Baubranche seit 1980. Fachkompetenz in den Richtungen: Bau, Architektur, Design, Hausbau.

Video-Anleitung: How to Treat Iris Borer.


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