SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Nielsen, Bent; Borgen, Anders; Kristensen, Lars.

In production of organic seed it is important to have some control measures on seed borne diseases to avoid propagation and spread of serious diseases. Due to lack of acceptable treatment methods the only way for the moment is to discard seed lots with unacceptable infections. Experiments have been started to find new and alternative methods for controlling seed borne diseases. In spring barley the results show good effect with 5% acetic acid on leaf stripe (Pyrenophora graminea) but problems with unacceptable effects on seed germination have to be solved. The old method with hot water treatment can be used and the results indicate good results against leaf stripe using water at 55°C. The effect of hot water was enhanced by first soaking the seeds in water...

Effect of seed treatment with milk powder and mustard flour in control of common bunt (Tilletia tritici) in wheat and stem smut (Urocystis occulta) in rye

Palavras-chave: Post harvest management and techniques Crop health; Quality; Protection Breeding; Genetics and propagation Cereals; Pulses and oilseeds.

Ano: 2000

URL: http://orgprints.org/1120/1/Controle_1120.htm

In field trials mustard flour was able to control seed borne infection by common bunt (Tilletia tritici) in wheat without decreasing the germination vigour of the treated seeds. Full control of common bunt by coating the seeds with milk powder could only be achieved at doses which reduced germination vigour of the seeds. Mustard flour can be recommended as a seed treatment in organic agriculture while a treatment based on milk powder should be developed in combination with biological control. Both milk powder and mustard flour can be used to control stem smut in rye (Urocystis occulta).

Forædlingsmål og forædlingsopgaver i økologisk korn og bælgsæd

Palavras-chave: Post harvest management and techniques Crop health; Quality; Protection Breeding; Genetics and propagation Cereals; Pulses and oilseeds.

Ano: 2001

URL: http://orgprints.org/1115/1/1115.htm

Kristensen, Lars; Østergård, Hanne; Jørnsgård, Bjarne.

Vigtige forædlingsmål og metoder for økologiske sorter diskuteres og der gives anbefalinger til prioriteringer.

Tipo: Report chapter

Palavras-chave: Breeding; Genetics and propagation.

Ano: 2001

URL: http://orgprints.org/3119/1/Foraedlingsmaal.pdf

Macroscopic leaf symptoms in wheat infected by Tilletia tritici

URL: http://orgprints.org/3192/1/Macroscopic_leaf_symptoms_in_wheat_infected_by_Tilletia_tritici.htm

Common bunt (Tilletia tritici) infects the wheat plant during germination of the seed. For experiments with common bunt it is conventional to examine symptoms of infection in the head of the plant. Previous research has advocated the possibility of scoring chlorosis on the leaf instead of head symptoms in order to reduce the duration of the experiment. By comparing the two diagnosis methods in climate chambers, the current experiment demonstrated that the sensitivity and specificity of the two methods depends on the wheat variety used. Using leaf symptoms as a diagnosis for infection has considerable disadvantages when used for screening for resistance in breeding programs, but have advantages e.g. when investigating effects of seed treatments.

Tipo: Journal paper

Palavras-chave: Breeding; Genetics and propagation.

Ano: 2003

Reduction of spore spread of common bunt (Tilletia tritici) via combining equipment

Kristensen, Lars; Borgen, Anders.

The disease common bunt (Tilletia tritici syn. T.caries) has become a more frequent problem in Europe during the last 15 year. In organic farming, common bunt causes serious problems for seed producers, and many seed lots are discarded due to contamination with Tilletia tritici. Due to the biology of Tilletia tritici, with spores loosely attached to the surface of the grain, there is a risk that spores can be disseminated via grain handling equipment, including combine harvesters. Preventive efforts should focus on the role of grain handling equipment, and how the fungus life cycle can be broken. We have investigated the dissemination of spores via the combiner after harvesting infected fields. We conducted six trials over three years, counting the number...

Tipo: Journal paper

Palavras-chave: Crop health; Quality; Protection Breeding; Genetics and propagation Cereals; Pulses and oilseeds.

Ano: 2001

URL: http://orgprints.org/1124/1/phd_appendiks2.htm

Seed borne diseases - a challenge for organic cereal production

Seed borne diseases are to be considered serious in organic agriculture, and direct seed treatment methods will some times be necessary. Hot water treatment, mustard extracts and acetic acid can provide efficient control methods. Discussions on the feasibility of the different methods in organic agriculture is needed.

Sortsafprøvning i korn og bælgsæd i økologisk jordbrug

Palavras-chave: Crop health; Quality; Protection Breeding; Genetics and propagation Cereals; Pulses and oilseeds.

Ano: 2000

URL: http://orgprints.org/1119/1/IFOAM2000seed.htm

Kristensen, Lars; Østergård, Hanne; Jørnsgård, Bjarne.

Behovet for og organiseringen af sortsafprøvning i forbindelse med økologisk jordbrug diskuteres

Tipo: Report chapter

Palavras-chave: Breeding; Genetics and propagation.

Ano: 2001

URL: http://orgprints.org/3121/1/Sortsafproevning.pdf

Spiringskvalitet af økologisk såsæd

Spore contamination of Tilletia tritici in seed lots as affected by field disease incidence

Artiklen gennemgår problemstillingen omkring vitalitet i økologisk såsæd, og giver anbefalinger til indsatser, der kan forbedre den.

Tipo: Report chapter

Palavras-chave: Cereals; Pulses and oilseeds.

Ano: 2001

URL: http://orgprints.org/3203/1/Kap_7.pdf

Seed lots normally become contaminated by spores of the seed borne common bunt (Tilletia tritici) during harvest of fields with infected plants. To demonstrate the relation between the number of infected plants in the field and the resulting number of spores in the harvested seed lot, a fixed number of infected tillers were placed in uncontaminated wheat fields. Two field experiments show that the number of spores in the seed lot is proportional to the number of infected plants in the field. Only 3% of the spores from the infected plants in the field end up in the seed lot after harvest with a combine harvester. However, only few spores in a seed lot is enough to establish infection in the next year field, and with a threshold of 10 spores/g seed which...