|
|
|
|
|
| Vogelgsang, Susanne; Bänziger, Irene; Krebs, Heinz; Legro, Robert; Sanchez-Sava, Victor; Forrer, Hans-Rudolf. |
| The fungal pathogen Microdochium majus, causing snow mould, seedling blight or foot rot results in severe yield losses in small grain cereals. There are few options to control this pathogen in organic production. In this study, aqueous extracts and powders from the botanicals chamomile, meadowsweet, thyme and Chinese galls were tested in vitro against M. majus conidia germination and mycelial growth. Subsequently, powders of three chosen botanicals were tested for their effect on emergence of M. majus infected wheat seedlings from soil in climate chambers. Furthermore, seed treatments with warm water, a commercialised bacterial product and one chosen botanical were tested in a field experiment throughout three consecutive years. Of the botanicals tested,... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds Crop health; Quality; Protection. |
| Ano: 2013 |
URL: http://orgprints.org/21458/1/21458_Vogelgsang.pdf |
| |
|
|
| Vogelgsang, Dr. Susanne; Bänziger, Irene; Krebs, Heinz; Legro, Robert; Forrer, Dr. Hans-Rudolf. |
| Snow mold, caused by the fungal pathogen Microdochium nivale, is an important seed-borne disease of various cereals and fodder plants, leading to reduced stands after emergence. No agricultural measures are known to prevent snow mold, hence, direct control measures are needed. For organic agriculture, seed dressing with plantbased products could be an alternative. In contrast to spray treatments onto the crop, the formulation and application of plant preparations onto seeds represents a greater challenge in terms of adhesion, persistence, and lasting efficacy. In the current study, three plant-based powders applied with two different seed coating materials were tested for their efficacy against MN of wheat. Both adjuvants demonstrated equally... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2009 |
URL: http://orgprints.org/14852/1/Vogelgsang_14852.pdf |
| |
|
|
| Krebs, Heinz; Musa, T.; Forrer, Hans-Rudolf. |
| In indoor trials with potted potato plants and in micro- and small plot field trials, prepa-rations of Frangula alnus controlled Phytophthora infestans leaf blight significantly bet-ter than other antifungal plant preparations and the copper free reference Mycosin®. However, under field conditions the efficacy of the buckthorn bark preparation (BBP) was drastically lower than in the indoor trials. Therefore and in order to avoid environ-mental pollution with solvent of the plant extract, we developed a procedure to apply finely ground plant material as suspension directly on the potato plants without any ex-traction. The efficacy of BBP applied as suspension was significantly higher than those of ethanolic extracts. To improve the weather stability or the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2007 |
URL: http://orgprints.org/9660/1/9660_Krebs_Vortrag.pdf |
| |
|
|
| Gunst, Lucie; Krebs, Heinz; Dubois, D.; Forrer, H.-R.. |
| In the DOK long-term field trial in Switzerland comparing bio-dynamic, bio-organic, and conventional farming systems, the occurrence of Fusarium species and Microdochium nivale on grains of wheat was investigated from 1997 to 2003. Although no differences between the farming systems were found, the previous crop, the fertilisation level, and the year significantly influenced the disease incidence. In 2003, the effect of the pre-crops potatoes versus silage-maize on fusaria was compared. As expected, the incidence of fusaria was significantly higher after maize compared with potatoes. However, the main responsible species was not F. graminearum but F. poae. This species is known for the production of hazardous toxins. A greater input of fertiliser resulted... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Crop combinations and interactions Cereals; Pulses and oilseeds Composting and manuring. |
| Ano: 2005 |
URL: http://orgprints.org/3781/1/3781.pdf |
| |
|
|
| Dorn, Brigitte; Musa, Tomke; Krebs, Heinz; Fried, Padruot; Forrer, Hans-Rudolf. |
| In laboratory, growth chamber, micro-plot and small-plot field trials, 53 copper-free preparations (CFPs) were examined for their potential to control potato late blight (PLB) caused by Phytophthora infestans (PI). In-vitro, 43% of the CFP inhibited the germination of sporangia or the mycelial growth of the pathogen completely. In growth chamber trials, 21% of them reduced PI foliar blight of tomato seedlings by at least 80%. In contrast, in small-plot field trials with potatoes under practice like applications, none of the CFPs sufficiently controlled the disease. Even in micro-plot field trials with applications twice a week the efficacies did not exceed 60%. With in-vitro tests we showed that the reason for the insufficient performance of the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2009 |
URL: http://orgprints.org/14095/1/Dorn_14095.pdf |
| |
|
|
| Krebs, Heinz; Vogelgsang, Susanne; Forrer, Hans-Rudolf. |
| Since more than hundred years, copper-products are used to control late blight of potato, caused by Phytophthora infestans. However, the heavy metal copper accumulates in the soil and affects soil flora and fauna. For this reason, copper agents are listed in the EU only until the end of November 2016. In conventional and integrated farming, copper products have been replaced by synthetic fungicides. In organic production, intensive research is conducted to develop effective alternatives that could replace copper fungicides. In Germany, plant strengthening agents based on phosphonate are allowed to be used in organic viticulture until the end of the flowering period to control downy mildew. However, if vine plants are treated with phosphonate after... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2013 |
URL: http://orgprints.org/21601/1/21601_krebs.pdf |
| |
|
| |
|
|
| Forrer, Hans-Rudolf; Musa, Tomke; Krebs, Heinz; Dorn, Brigitte. |
| Phytophthora infestans, the cause of late blight, is the most devastating pathogen in potatoes world-wide. To replace copper fungicides in organic potato production, we examined preparations based on plant extracts, micro-organisms, and other natural compounds for their effect on late blight in field trials as well as in vitro and in vivo. Most of this work we realised as participants of the EU project Blight-MOP. The majority of the preparations effectively inhibited P. infestans in vitro or in vivo on tomato plants. However, under field conditions and with applications once a week, commercial and experimental copper-free preparations failed to sufficiently control late blight. In contrast, copper fungicides applied according to the decision support... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/7513/1/_org_joint_congress_010306.pdf |
| |
|
|
|
