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Fine silica particles applied onto fruit tree stems against Woolly apple aphid, Eriosoma lanigerum (Hausm.) and the Europaen earwing, Forficula auricularia L

The present work deals with a new strategy to control Eriosoma lanigerum (Hausm.) in apple and Forficula auricularia (L.) in apricots. With common insecticides, both pests are difficult to control. Although F. auricularia is regarded as a beneficial insect, in ecological agriculture it has the poten...

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Bibliographic Details
Published in:Gesunde Pflanzen 2008-03, Vol.60 (1), p.15-21
Main Authors: Welke, Bettina, Mewis, Inga, Mucha-Pelzer, Tanja, Ulrichs, Arunava Goswami und Christian
Format: Article
Language:eng ; ger
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Summary:The present work deals with a new strategy to control Eriosoma lanigerum (Hausm.) in apple and Forficula auricularia (L.) in apricots. With common insecticides, both pests are difficult to control. Although F. auricularia is regarded as a beneficial insect, in ecological agriculture it has the potential to cause severe economical damage in apricots. In apple and apricot orchards we tested treatments on the bark with diatomaceous earth (DE) products to prevent insects from reaching the tree crown. de has been applied as liquid ('Fossil Shield ' translucend) by a backpack sprayer or electrostatically as powder ('Fossil Shield ' 90.0 s). In some trials we covered the treated area with a plastic funnel (fruitcap) in order to protect the silica-product from wind and rain. Experiments were evaluated weekly and number of insects in the tree crown was counted. During the first two months after treatment E. lanigerum population in the crown was reduced by 98.2%. However, over the whole period of six month the barriers turned out to be ineffective (p = 0.617). Winged adults have been capable to pass the barriere. In contrast to this fruitcap barriers were able to keep F. auricularia away from the crown (p = 0.000). They have been as effective as standard treatment using glue. In such treatments apricot yield increased 6-fold for the cultivar 'Goldrich' and 5.5-fold for the cultivar 'Hargrand'.Original Abstract: Die vorliegende Arbeit befasst sich mit einer neuartigen Strategie zur Abwehr von Eriosoma lanigerum (Hausm.) am Apfel bzw. Forficula auricularia (L.) an Aprikosen. Mit herkoemmlichen Insektiziden laesst sich der Schaderreger E. lanigerum nur schwer in seiner Verbreitung hemmen. F. auricularia gilt im Oekolandbau allgemein als Nuetzling, sorgt aber speziell im Aprikosenanbau fuer hohen oekonomischen Schaden. Die insektizide Wirkung von Diatomeenerden ist schon seit Jahren bekannt und wird im Vorratsschutz und in der Massengefluegelhaltung zur Parasitenbekaempfung eingesetzt. In zwei mit der Diatomeenerde "Fossil Shield ' (FS) durchgefuehrten Langzeitversuchen wurde untersucht, inwieweit erstens Stammapplikationen das Ausbreitungsverhalten von E. lanigerum in die Baumkrone beeinflussen koennen und zweitens ob FS-Stammbeschichtungen eine physikalische Barriere fuer F. auricularia darstellen. Die Versuchspflanzen wurden einmal woechentlich auf Blutlausbefall untersucht. In den ersten zwei Monaten nach den FS-Stammbehandlungen gegen E. lanigerum konnten Wirkungsg
ISSN:0367-4223
1439-0345
DOI:10.1007/s10343-008-0173-7