By T Goszczynska; J J Serfontein; S Serfontein; Plant Protection Research Institute (South Africa); BioNET-INTERNATIONAL.; All authors
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Additional info for Introduction to practical phytobacteriology : a manual for phytobacteriology
Can survive for extended periods in soil and water. Most of the other pathogens are poor competitors in soil and do not survive for extended periods, although some do survive in the soil between growing seasons. 58 Preservation of bacterial cultures Epidemiology and control * Control strategies include: Crop rotation with non-susceptible crops. Use of clean water or chemical treatment of irrigation water. Use of resistant varieties. Biological control of Agrobacterium spp. Crop debris and volunteer plants Although many pathogens do not survive in the soil, they do survive between seasons in crop debris left on the soil surface.
National Collection of Plant Pathogenic Bacteria, Plant Pathology Laboratory, Ministry of Agriculture, Fisheries and Food, Harpenden, Hertfordshire, England. Preservation of bacteria There are many ways of preserving bacteria. The choice of method depends on the nature of the microorganism, the preservation objectives and available facilities. + The main aims of preservation are to: Reduce the metabolic rate of the organism. Eliminate damage and changes in pathogenicity. Maintain high recovery and survival rate.
Control strategies include: Weed control. Control of epiphytic populations on the crop by a preventative copper bactericide spray programme. Insects In the USA, P. stewartii subsp. stewartii, the causal agent of Stewart’s wilt in sweet corn, overwinters in the corn flee beetle. The harshness of the winter determines the survival rate of corn flee beetles and the severity of Stewart’s wilt during the next season. Secondary sources The rate of secondary spread of bacterial diseases depends on environmental conditions as well as on human activities.