A crop rotation experiment was conducted at Pseudomonas solanacearum race 3 infested sites at Sabet (1750 m above sea level) and Ghandruk (2000 m asl) villages in western Nepal. The tested crop rotations were modified from a traditional 18-month period with rotation crops of land potato; barley; finger millet. Mustard, barley, finger millet and cold-toleraot upland rice were used as rotation crops, whereas soil amendment with urea (576 kg ha-1 , lime (2 t ha·\ and roguing of wilted plants were tested as integrated management treatments to control bacterial wilt (BW) of potato.  Bacterial wilt  incidence in the initial potato crop was 18% and 25% at Sabet and Ghandruk respectively and after a short rotation (6-month) involving mustard as a break crop wilt incidence was higher (57% and 97%) than the traditional cropping pattern after 18 months (2% and 12%) for the two sites. The traditional rotation of 18 months with potato-barley-finger millet alone or in combination with soil amendments of urea or lime, and roguing or an 18 months bare-fallow did not eliminate the soil borne bacterium at Sabet, however at Ghandruk urea and roguing had a significant effect on reducing bacterial wilt incidence. No disease at all was observed following a rotation of 30 month with potato-barley-finger millet-upland rice and the results were consistent at both locations.  Testing for latent infection by P. solanacearum on progeny tubers from non-wilted plots of any treatment was conducted to determine whether soil borne populations of P. solanacearum could be eliminated. Tubers harvested from non-wilted plots of all 18- month rotation treatments produced either brown rot during storage or bacterial wilt upon subsequent planting showing that the plants were latently infected. Tubers from the 30-month rotation treatment neither developed brown rot symptoms in storage nor BW on subsequent planting. Results show that 2112 years crop rotation can eliminate the bacterium from an infested soil under natural conditions in the hills of Nepal.

A crop rotation experiment was conducted at Pseudomonas solanacearum race 3 infested sites at Sabet (1750 m above sea level) and Ghandruk (2000 m asl) villages in western Nepal. The tested crop rotations were modified from a traditional 18-month period with rotation crops of land potato; barley; finger millet. Mustard, barley, finger millet and cold-toleraot upland rice were used as rotation crops, whereas soil amendment with urea (576 kg ha-1 , lime (2 t ha·\ and roguing of wilted plants were tested as integrated management treatments to control bacterial wilt (BW) of potato.  Bacterial wilt  incidence in the initial potato crop was 18% and 25% at Sabet and Ghandruk respectively and after a short rotation (6-month) involving mustard as a break crop wilt incidence was higher (57% and 97%) than the traditional cropping pattern after 18 months (2% and 12%) for the two sites. The traditional rotation of 18 months with potato-barley-finger millet alone or in combination with soil amendments of urea or lime, and roguing or an 18 months bare-fallow did not eliminate the soil borne bacterium at Sabet, however at Ghandruk urea and roguing had a significant effect on reducing bacterial wilt incidence. No disease at all was observed following a rotation of 30 month with potato-barley-finger millet-upland rice and the results were consistent at both locations.  Testing for latent infection by P. solanacearum on progeny tubers from non-wilted plots of any treatment was conducted to determine whether soil borne populations of P. solanacearum could be eliminated. Tubers harvested from non-wilted plots of all 18- month rotation treatments produced either brown rot during storage or bacterial wilt upon subsequent planting showing that the plants were latently infected. Tubers from the 30-month rotation treatment neither developed brown rot symptoms in storage nor BW on subsequent planting. Results show that 2112 years crop rotation can eliminate the bacterium from an infested soil under natural conditions in the hills of Nepal.