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Kultur
Schadbild
- Beeren vertrocknen unter Schwarzfärbung
- Trockenfäule
- bei feuchter Witterung lachsfarbige Sporenlager auf der Frucht
- Stielgerüst bleibt intakt
Schaderreger
- Erreger überwintert als Acervuli unter der Epidermis der Wirtspflanze
- Freisetzung von Konidienträgern und Konidien bei entsprechender Witterung
- Colletotrichum-Infektionen werden häufig bereits zur Blüte, bei feuchtwarmer Witterung, gesetzt Temperaturbedarf: >15 °C ; Temperaturoptimum: 20-27 °C
- Infektionsbedingungen: bei 15 °C ca. 25-50 Stunden Blattnässe für Infektionen erforderlich; bei 20 °C 11-18 Stunden Blattnässe
- Weiterverbreitung der Konidien durch Niederschläge
- lange Latenzphase bis zum Ausbruch der Krankheit
Prophylaxe und Bekämpfung
- ausgewogene Wasser- und Nährstoffversorgung
- komplette Beerntung
- Verrottung des Laubes, z.B. durch Mulchen beschleunigen
- Bekämpfungstermin: nach Warndienstaufruf ab Blühbeginn; 1-2 Folgebehandlungen bei feuchtwarmer
- Witterung während der Blüte und bei Infektionsgefahr im Hochsommer
- geeignete PSM: organische Fungizide siehe Pflanzenschutzempfehlung
Bedeutung
- wichtige Erkrankung, zumeist jährlich ertragsrelevant
- Befallsstärke abhängig vom Witterungs- und Infektionsverlauf während der Blüte, sowie vom Vorjahresbefall
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