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| Spitaler, Renate; Marschall, Klaus; Zidorn, Christian; Kelderer, Markus; Zelger, Roland; Stuppner, Hermann. |
| The growth inhibiting effect of four commercially available grapefruit seed extracts on the causal organism of apple scab Venturia inaequalis was tested. Germination of the conidia of Venturia inaequalis was pronouncedly inhibited by all tested extracts. The commercial products were analyzed by high pressure liquid chromatography and thin layer chromatography. All samples contained at least one preserving agent. These substances were identified as either benzethonium chloride, benzalkonium chloride, methyl parabene or propyl parabene. Freshly prepared extracts from seeds of grapefruits (Citrus paradisi) did not inhibit the germination of Venturia inaequalis. It was therefore concluded that the antifungal effect of grapefruit seed extracts is... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Fruit and berries. |
| Ano: 2004 |
URL: http://orgprints.org/14543/1/39_Kelderer_208_211.pdf |
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| Zemmer, Franziska; Marschall, Klaus; Kelderer, Markus; Zelger, Roland. |
| Since lime sulphur was accepted in the annex 2b of the European Regulation 2091/92, more and more fruit growers use it to control apple scab in organic orchards. Field trials were carried out at the Research Centre Laimburg to evaluate stop and curative treatments with the aim to reduce the number of treatments and improving their efficacy. In this diploma thesis microscopic observations were performed for a better understanding of the mode of action of lime sulphur on apple-scab. The results showed that lime sulphur can stop the scab infection until the formation of the appressorium. If the infection proceeds to the formation of the primary stroma, the efficacy of the treatments with lime sulphur was insufficient. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Fruit and berries. |
| Ano: 2002 |
URL: http://orgprints.org/14605/1/zemmer_94.pdf |
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