The influence of inoculum density and environment on the development of potato blackleg |
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| Authors: | John R Aleck M D Harrison |
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| Institution: | 1. Department of Botany and Plant Pathology, Colorado State University, 80523, Fort Collins, Colorado
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| Abstract: | Significant increases in pre-emergence seedpiece decay and preemergence shoot infection were observed asErwinia carotovora var.atroseptica inoculum density increased. As inoculum density increased, a point was reached where virtually 100 per cent of the disease was expressed as preemergence decay and no typical postemergence blackleg occurred. Soil temperature and soil moisture markedly affected blackleg incidence, especially at low inoculum densities. Increasing soil temperature (from O°C to 30°C) and soil moisture (from 65 to 100% of field capacity) usually resulted in an increased total blackleg incidence. The effect of soil temperature and soil moisture appeared to be masked at high inoculum densities. Conditions such as low inoculum density and/or cool soil temperatures and low soil moistures which apparently slowed the rate of seedpiece decay usually increased the amount of postemergence blackleg, but also reduced the total amount of disease which occurred. It is suggested that conditions which are not optimal for the pathogen result in increased amounts of typical easily diagnosed postemergence blackleg expression, whereas conditions which favor the pathogen may reduce this phase of the disease but actually increase the total loss by increasing the amount of seedpiece decay and preemergence death of potato shoots. |
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