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| Bengtsson, M.; Hockenhull, J.. |
| The Danish research project StopScab (2002-2004) has recently been initiated to identify and begin to develop some new approaches and materials for the control of apple scab in organic growing. Four linked objectives are included: 1) screening of materials for scab control 2) histopathological investigation of host-pathogen interactions 3) orchard testing of selected control compounds and 4) characterisation of metabolite profiles in apples |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/9985/1/9985.pdf |
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| Bengtsson, M.; Green, H.; Leroul, N.; Pedersen, H.L.; Hockenhull, J.. |
| The effect of autumn application of urea on the activity and composition of saprotrophic fungi associated with sour cherry (Prunus cerasus) leaf litter infected with the leaf spot pathogen, Blumeriella jaapii, was studied under orchard conditions from the time of leaf fall to the release of ascospores, the following spring. The ability of treatment of infected leaves post leaf fall with urea or with inoculum of selected fungal strains to reduce primary inoculum (ascospores and winter conidia) of B. jaapii in spring was evaluated. Fungal activity was measured enzymatically by quantifying -N-acetylglycosaminidase and fungal composition and frequency were evaluated following isolation at low temperature of mycelia embedded in leaf particles. Activity of the... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/9991/1/9991.pdf |
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| Bengtsson, M.; Hockenhull, J.; Neergaard, E.de. |
| The formation and development of over-wintering structures of the leaf spot pathogen Blumeriella jaapii in urea treated leaves of sour cherry (Prunus cerasus) during autumn, early winter and in May were studied histopathologically and compared to leaves treated with water. Resin embedding using glycol methacrylate (GMA) and subsequent staining of sections with Amido Black were used. Macroscopic and microscopic studies of B. jaapii in water treated leaves showed that the development of the over-wintering stages begins randomly in individual leaf spots both pre and early post leaf fall. Saprotrophic growth and stroma formation in leaves is completed between six to eight weeks after leaf fall. During the following spring stromata normally develop apothecia or... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/9990/1/9990.pdf |
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| Heijne, B.; Jong, P.F. de; Köhl, J.; Speksnijder, A.G.C.L.; Hockenhull, J.; Bengtsson, M.; Lindhard Pedersen, H.; Paaske, K.; Eiben, U.; Tamm, L.; Trapman, M.. |
| Improved prevention and control of apple scab caused by Venturia inaequalis is aimed at without the use of copper containing products in the Repco-project. Substantial progress is made in selection of potential products against summer epidemics. A patent application is made for E73. New effective biocontrol agents are selected to reduce inoculum during winter. The product potassium bicarbonate has shown good efficacy and Repco contributes to the registration of this product in Europe. Earthworms tended to be stimulated to consume apple leaves treated with amino acids or beetpulp, especially when applied fresh under controlled environmental condi-tons. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/7781/1/applescab%2DBHeijne.pdf |
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| Bengtsson, M.; Heijne, B.; Jong, P.F. de; Jørgensen, H.J.L.; Paaske, K.; Pedersen, H.L.; Trapman, M.; Wulff, E.; Hockenhull, J.. |
| Apple scab (Venturia inaequalis (Cke.) Wint.) causes serious losses in quality and yield of organically as well as conventionally grown apples. Organic apple growers are highly dependent on the use of sulphur, lime sulphur and copper fungicides to control apple scab. Whereas only elemental sulphur is permitted for scab control in organic apple production in Denmark, and in addition lime sulphur in The Netherlands, copper fungicides are used in organic production in many European countries. However, the use of copper fungicides in the EU is now being phased out (EU Council Regulation (EEC) No. 2092/91) and alternative fungicides for control of apple scab and other diseases in other crops are increasingly needed. As part of the EU project REPCO (Replacement... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/9987/1/9987.pdf |
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| Bengtsson, M.; Jørgensen, H.J.L.; Pham, A.; Wulff, E.; Hockenhull, J.. |
| A range of possible substitutes for copper-based fungicides for control of apple scab (Venturia inaequalis) in organic growing were tested in laboratory and growth chamber experiments in the Danish project StopScab (2002-2004). Eighteen crude plant extracts, 19 commercial plant-based products and 6 miscellaneous compounds were tested for their ability to reduce scab symptoms on apple seedlings. Most of the compounds were also tested for their effect on conidium germination on glass slides. Fourteen of the crude plant extracts, 13 of the commercial plant products and 5 of the miscellaneous compounds showed promising control efficacies when used either preventively or curatively in the plant assay. A histopathological study was carried out on the mode of... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2005 |
URL: http://orgprints.org/9988/1/9988.pdf |
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| Bengtsson, M.; Jørgensen, H.J.L.; Pham, A.; Wulff, E.; Hockenhull, J.. |
| A range of possible substitutes for copper-based fungicides for control of apple scab (Venturia inaequalis) in organic growing were tested in laboratory and growth chamber experiments in the Danish project StopScab (2002-2004). Eighteen crude plant extracts, 19 commercial plant-based products and 6 miscellaneous compounds were tested for their ability to reduce scab symptoms on apple seedlings. Most of the compounds were also tested for their effect on conidium germination on glass slides. Fourteen of the crude plant extracts, 13 of the commercial plant products and 5 of the miscellaneous compounds showed promising control efficacies when used either preventively or curatively in the plant assay. A histopathological study was carried out on the mode of... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/9984/1/022_123%2D127_Bengtsson.pdf |
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