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| Hann, Dr. Patrick; Kromp, Dr. Bernhard. |
| The broad-leaved dock (Rumex obtusifolius) is a widely distributed weed of cultivated grasslands. Since the dock leaf beetle (Gastrophysa viridula) can defoliate docks extensively, if occurring in sufficient high densities, it is considered to be a potential part of a biocontrol strategy against R. obtusifolius. Our study aimed at investigating the influence of precipitation on the distribution of G. viridula. For that, 635 questionnaires were sent out to organic farmers and surveys were conducted on 39 farms in Lower Austria. The results showed G. viridula preferring regions with sufficient precipitation. These observations confirmed laboratory results reported in literature and should be considered in a concept for the enhancement of dock beetle... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Pasture and forage crops. |
| Ano: 2009 |
URL: http://orgprints.org/14356/1/Hann_14356.pdf |
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| Hann, Dr. Patrick; Grünbacher, Mag. Eva-Maria; Trska, Mag. Claus; Kromp, Dr. Bernhard. |
| Recent changes in occurrence of agricultural pests in Austria might already reflect climate change phenomena. In this study, an inventory of white grub (Melolontha melolontha, Amphimallon solstitiale and Phyllopertha horticola) damages in Austrian grassland including organic cultivation was performed by questioning plant protection consultants of 74 Agricultural County Chambers. Altogether, a cumulated 14.800 hectares of white grub damages were recorded. From 2000 onwards, a steady increase of white grub damages occurred with a climax in the year of heat and drought 2003. The infested fields extended along the alpine main ridge from Vorarlberg up to the alpine foreland. Additionally, southern slopes of the Danube valley in Upper and Lower Austria were... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2008 |
URL: http://orgprints.org/15730/1/Grub_damages_Hann_et_al_2008.pdf |
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