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Registros recuperados: 53
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Ecofruit 1995 Organic Eprints
Kelderer, Markus; Casera, Claudio; Lardschneider, Ewald.
Tipo: Proceedings Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 1995 URL: http://orgprints.org/14891/1/Ecofruit_1995.pdf
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Ecofruit 1997 Organic Eprints
Kelderer, Markus; Casera, Claudio; Lardschneider, Ewald.
Tipo: Proceedings Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 1997 URL: http://orgprints.org/14927/1/Ecofruit_1997.pdf
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Versuche zur Regulierung der Wühlmäuse im biologischen Obstbau Organic Eprints
Kelderer, Markus; Lösch, Robert; Lardschneider, Ewald; Casera, Claudio.
In the organic apple orchards in South Tyrol different voles (Fam. Arvicolidae) are the cause of big damages on the trees. At present there isn't any product listed t the annex 2b of the EC- decree 2092/91 for organic agriculture, which could control the voles efficiently. Therefore it is quite difficult to control the voles in organic orchards. It is necessary to convince European and national authorities, associations and organs of control to allow the use of suitable products. Our trials showed that Silmurin, an extract of the red sea-onion (Uriginea marsitima) controls quite efficiently the field mouse (Microtus arvalis), but hasn't any effect against the earth vole (Arvicola terrestris). Against these voles we obtained good results with...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2000 URL: http://orgprints.org/14904/1/67_kelderer_m..pdf
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Mode of action of lime sulphur against apple-scab (Venturia inaequalis) Organic Eprints
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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Results of 5 years of thinning trials with lime sulphur in South Tyrol Organic Eprints
Kelderer, Markus; Lardschneider, Ewald; Casera, Claudio.
Thinning trials with lime sulphur were carried out for 5 years on different sites in South Tyrol. The sprays were applied during blossom to various varieties. During these trials different amounts of active ingredients, water volumes and numbers of treatments were used. Beside the thinning effect the influence on yield (kg/tree) and Fruit quality (average size of the Fruits, fruit-russetting, fruit-deformations) and the return bloom of the treated trees were evaluated. In several cases the use of lime sulphur gave satisfactory results (thinning effect >20%). The results showed a correlation with the amount of active ingredient, water volume, and number of treatments. In most of cases it was possible to increase the average Fruit size. The influence on...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2002 URL: http://orgprints.org/14610/1/kelderer_112.pdf
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Influence of fungicides used in organic orchards on the net-photosynthesis of apple trees Organic Eprints
Mittersteiner, Roland; Kelderer, Markus.
Im biologischen Obstbau sind einige wenige Kontaktfungizide (Schwefel-, Kupfer-, Tonerdenpräparate) zur Schorfregulierung zugelassen. Aus der Literatur ist bekannt, dass sich diese Fungizide unterschiedlich auf die Netto-Photosynthese (PN) der Pflanzen auswirken (HOFFMAN 1935, CLORE 1936, MURPHY 1939, SOUTHWICK & CHILDERS 1939). PN spiegelt den Kohlenstoffgewinn abzüglich des Energieverbrauchs durch Atmung wieder. Deshalb hängen Ertrag, Fruchtqualität und Wachstum von Apfelbäumen, neben der Verwertung und Verteilung des Kohlenstoffs innerhalb der Pflanze, auch davon ab, wie viel insgesamt davon aufgenommen wird (LANGE & LENZ 1997, HANSEN 1978). In dieser Arbeit wurde untersucht, wie sich Behandlungen mit Kupfer, Schwefel, Schwefelkalk und Ulmasud...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2002 URL: http://orgprints.org/14626/1/mittersteiner_192.pdf
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Inhibition of the germination of conidia from Venturia inaequalis using lime sulphur, sulphur, copper and Ulmasud in comparison to Dithianon Organic Eprints
Zemmer, Franziska; Marschall, Klaus; Kelderer, Markus; Zelger, Roland.
In der vorliegenden Arbeit wurde in einem standardisierten Test die fungizide Wirkung von Schwefelkalk, Schwefel, Kupfer und Ulmasud auf die Keimung von Schorfkonidien untersucht. Als Standardfungizid wurde der Wirkstoff Dithianon verwendet.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2002 URL: http://orgprints.org/14606/1/zemmer_96.pdf
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Ryania Speciosa: an insecticide for organic orchards? Organic Eprints
Kelderer, Markus; Sgarbossa, Manuela; Schönweger, Gudrun; Elias, Ellen; Roland, Zelger; Santer, Johann; Stuppner, Hermann.
Ryania speciosa is a grove belonging to the family Flacourtiacea, located in tropical climates in Central- and South- America. The Indigenous population used the plant, which contains toxic alkaloids, against cockroaches. In the forties the ground wood was used as insecticide against different pests. In the first version of annex 2b from the EC regulation 2092/91, Ryania was still listed, but it was subsequently cancelled due to its lack of registration as a pesticide in any European country. In organic farming, only a few insecticides are allowed, but in orchards there is a permanent need to control larvae such as coddling moth, etc. The Italian Ministry of Agriculture initiated a survey to investigate the possibility of developing an 'organic'...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2004 URL: http://orgprints.org/14024/1/5_Kelderer_25_28.pdf
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Results from two years of sanitation measures to reduce apple scab in organic orchards Organic Eprints
Kelderer, Markus; Lardschneider, Ewald; Marschall, Klaus.
Scab is still a big challenge for those apple orchards which are managed organically. Inoculum survives during winter in leaf litter, and sporulates in spring when vegetation starts. Different surveys in other regions showed that it is possible to reduce the presence of scab in apple orchards by removing the leave litter from the orchards. Different trials were carried out to understand if sanitation measures would also be of practical interest in organic orchards in South Tyrol. The results varied. In some trials, scab was reduced on the leaves up to 60%, in others no differences were observed. It is therefore not clear if the results justify the expense of cost and time for such measures.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2004 URL: http://orgprints.org/14082/1/17_Triloff_87_90.pdf
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Apple scab control with grapefruit seed extract: no alternative to chemical fungicides Organic Eprints
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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A comparison between organic and integrated apple production: First results after 5 years of observation Organic Eprints
Kreuzwieser, Andreas; Kelderer, Markus.
Organic apple production is of increasing commercial importance throughout Europe, but especially in South Tyrol where about 25% of the whole European organic apple crop is produced. In organic apple production, producers face the challenge of choosing varieties that are both in demand and also resistant to the main pests and diseases. Every now and then, the question arises, if yields, losses and profitability are different in integrated and organic orchards and in how great are the differences between single apple varieties. In 1999 the Laimburg Research Centre started a field trial to observe the effects of different cultivation methods on 18 apple varieties in a randomised block design. In the first four years of production, significant...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2004 URL: http://orgprints.org/14546/1/43_Kelderer_227_234.pdf
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Reduction of net photosynthesis after blossom: a possibility to control alternate bearing in organic orchards? Organic Eprints
Prantl, Markus; Lardschneider, Ewald; Grapadelli, Luca Corelli; Kelderer, Markus.
Conventional and integrated fruit growers have the possibility to use Carbaryl and Benzyladenin 2 thinning agents, which allow crop regulation at a relatively late stage (10 – 16 mm of fruit size). At that stage, organic fruit growers can only thin by hand, which is quite time-consuming. A few surveys show that reducing net photosynthesis after blossom increases the June drop. This could be an interesting new approach for organic apple orchards. In 2003 a trial was carried out at the Laimburg Research Station to understand if application of high amounts of bentonite could achieve that goal. The results were encouraging, but still not recommendable to practical growers.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2004 URL: http://orgprints.org/14544/1/40_Kelderer_217_221.pdf
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Residues of copper and sulphur on fruits from organic orchards Organic Eprints
Kelderer, Markus; Matteazzi, Aldo; Casera, Claudio.
Copper und sulphur compounds are listed in annex 2b of the EC regulation 2091/92 and are used in organic orchards to control scab, mildew and sooty blotch also during summer time. In Italy, copper compounds have a waiting period from 20 days between last treatment and harvest, for sulphur compounds it differs and can reach until 30 days for lime sulphur. The trials carried out showed that using the recommended low dosages for copper and lime sulphur it should not be a problem to reduce these waiting periods. The residues remained clearly under the legal values, also when the samples where collected the same day of the treatment.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2004 URL: http://orgprints.org/14542/1/39_2_Kelderer_213_216.pdf
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Vinasse: an alternative to lime sulphur for flower thinning? Organic Eprints
Kelderer, Markus; Lardschneider, Ewald; Casera, Claudio.
Thinning trials with vinasse in comparison to lime sulphur were carried out for 4 years at different sites in South Tyrol. Beside the thinning effect, the influence on fruit quality, phytotoxic damage on the leaves and the return bloom of treated trees were evaluated. Depending on the dosage the vinasse treatments showed a good thinning effect, but russetting and leave damages were significantly higher in comparison to lime sulphur. Return bloom of vinasse treated trees was lower than of those treated with lime sulphur. In conclusion, vinasse treatments can not substitute lime sulphur for flower thinning in organic apple orchards.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2004 URL: http://orgprints.org/14531/1/30_Kelderer_163_168.pdf
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Effects of the period of application of K-phosphite on residues on apple fruits Organic Eprints
Kelderer, Markus; Matteazzi, Aldo; Casera, Claudio.
K-phosphite is very efficient against several plant diseases. Nevertheless at the moment there is no official registration in Europe as a plant protection material. In conventional winegrowing K-phosphite is used in different countries to regulate the main disease ‘Plasmopora viticola’ under the disguise of a foliar fertilizer or a plant strengthener. In organic apple production only a few fungicides to regulate scab are available. In addition, copper products are limited by European and national legislations. The discussion about Kphosphite for organic farming points always at the problem of synthetic residues on the edible parts of the vegetables. The aim of this field-trial carried out during the season of 2005 was to assess the residues on...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2006 URL: http://orgprints.org/13868/1/ecofruit_12th_39.pdf
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Erste Ergebnisse mit dem Einsatz von K-hydrogencarbonat in Südtirol Organic Eprints
Kelderer, Markus; Casera, Claudio; Lardschneider, Ewald.
In the EC at the moment only cupper and sulphur products are allowed to regulate a multiplicity of diseases in different vegetable crops. On the other hand it is well know that both have also negative side effects on beneficial organisms and the soil. Since many years researches are looking for alternatives to reduce and substitute the use of the mentioned products. Bicarbonates are substances which were pointes out for many years. They are present in nature and were used in the past in organic farming. Until now there was no registration for them in the EC as plant protection materials. There is a palpable possibility that it would change in future, what will open the possibility to apply for the introduction of potassium bicarbonate in annex 2B of the...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2006 URL: http://orgprints.org/8824/1/ecofruit_12th_17.pdf
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Thinning effect of lime sulphur applied during blossom with the overhead irrigation system in comparison to the sprayer Organic Eprints
Kelderer, Markus; Lardschneider, Ewald; Casera, Claudio.
A large number of organic fruit-growers in South Tyrol regulate scab with scab-stop treatments using the overhead irrigation system. They use mainly lime sulphur, because it is particularly suitable for scab stop treatments. Treatments during blossom can also thin the flowers. The aim of the field-trials was to understand if lime sulphur applied with the overhead irrigation system gives the same thinning effect like the normal application with the sprayer. The results from the 2 years of trials show that there is no significant difference between the two application systems. Other factors like the influence of the different climatic parameters in each year play a more important role.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2006 URL: http://orgprints.org/13870/1/ecofruit_12th_41.pdf
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Nebenwirkungen auf den Fruchtansatz der Behandlungen von Schwefelkalk in die Blüte mit der Beregnung bzw. mit dem Sprüher Organic Eprints
Kelderer, Markus; Mateazzi, Aldo; Casera, Claudio.
K-phosphite is very efficient against several plant diseases. Nevertheless at the moment there is no official registration in Europe as a plant protection material. In conventional winegrowing K-phosphite is used in different countries to regulate the main disease ‘Plasmopora viticola’ under the disguise of a foliar fertilizer or a plant strengthener. In organic apple production only a few fungicides to regulate scab are available. In addition, copper products are limited by European and national legislations. The discussion about K-phosphite for organic farming points always at the problem of synthetic residues on the edible parts of the vegetables. The aim of this field-trial carried out during the season of 2005 was to assess the residues on apples...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2006 URL: http://orgprints.org/9025/1/ecofruit_12th_39.pdf
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Was bringen die derzeit 'verfügbaren' Bioherbizide? Organic Eprints
Kelderer, Markus; Casera, Claudio; Lardschneider, Ewald.
Mainly in Anglo-Saxon countries (USA, New Zealand etc.) the market for organic agriculture inputs offers different natural substances for the use as bio-herbicides. The most important ingredients of these products are acetic acid, citric acid and clove-extracts (eugenol) in the case of post-emergence herbicides and corn-gluten in pre-emergence products. In a first screening test we compared the efficacy of these ingredients with some other natural substances. The most interesting ones were later compared in a field trial where the efficacy and the required dosages to clean a strip of about 40 cm under the trees were assessed in an ap-ple orchard. A few products showed interesting results (vinegar, pine oil), but the required dosage to keep the strip under...
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management; Fruit and berries.
Ano: 2006 URL: http://orgprints.org/9017/1/ecofruit_12th_32.pdf
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Phytotoxicity of different sulphur products applied with the sprayer or with the overheat irrigation system on Braeburn apples Organic Eprints
Kelderer, Markus; Casera, Claudio; Lardschneider, Ewald.
The apple variety Braeburn is very popular among the organic apple growers in South Tyrol. Braeburn brings high and regular yields and good prices at the north European fruit and vegetable market. Braeburn is quite susceptible to scab and mildew. To regulate this latter disease the organic orchardists use mainly sulphur products. Braeburn however is sensitive to sulphur treatments. Mainly during summer at high temperatures the leaves of Braeburn treated with sulphur develop a yellowish colour and necrotic spots. A field-trial was carried out for 2 years to investigate which sulphur formulations and application techniques give less phytotoxic problems to leaves and fruits of the apple variety Braeburn. The results show only small differences between...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Fruit and berries.
Ano: 2006 URL: http://orgprints.org/13869/1/ecofruit_12th_40.pdf
Registros recuperados: 53
Primeira ... 123 ... Última
 

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