The effect of methyl bromide fumigation on rhizomania inoculum in the field

Autor: G. J. Bell, C. M. Henry, S. A. Hill
Rok vydání: 1992
Předmět:
Zdroj: Plant Pathology. 41:483-489
ISSN: 1365-3059
0032-0862
DOI: 10.1111/j.1365-3059.1992.tb02443.x
Popis: The first outbreak of rhizomania disease in the UK occurred in 1987 and was limited to a single sugar-beet crop in Suffolk. In an attempt to prevent the spread of this disease, the crop was first destroyed by herbicide. In 1988, to reduce the level of rhizomania still present in the soil, the field was treated with methyl bromide at a rate of 900 kg/ha prior to seeding for permanent pasture. Levels of methyl bromide were monitored during the fumigation. A mean concentration time product of 5500 mgh/1 was achieved after 72 h at the soil surface and of 3300-4100 mg-h/1 at a soil depth of 0.3 m after 24 h. Soil samples were taken from five plots across the field before and after fumigation. In the plot with the highest initial inoculum levels, further samples were taken at three depths down to 0.61 m. Sugar-beet seedlings were grown in all soil samples as a bait test for rhizomania inoculum. The presence or absence of Polymyxa betae was observed by microscopical examination, and an enzyme-linked immunoassay was used for the detection of beet necrotic yellow vein virus (BNYVV). The results showed that the methyl bromide treatment had reduced rhizomania inoculum and BNYVV in the soil to levels that were undetectable by the procedures used.
Databáze: OpenAIRE
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