Potato Review Group

Contents

Wound healing conditions

Storage conditions

Influence of condensation on disease and quality

Measuring condensation risk

Disease development during storage

Store hygiene: general principles

Further information:

Storage notes

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Wound healing conditions

  1. In general, warm humid conditions facilitate wound healing and therefore reduce the risk of disease infection and development. More …
  2. However, a very high humidity can increase Pectobacterium soft rots (95 % RH cf 85 % RH).

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Storage conditions

  1. In general, cool dry conditions during storage reduce the risk of disease development.
  2. However, skin spot and gangrene may develop at low temperatures.
  3. Condensation during storage may increase the risk of:

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Influence of condensation on disease and quality

  1. Moisture on tuber surface promotes silver scurf and skin spot. Sporulation in store and may reactivate Rhizoctonia and black dot in adhering soil.
  2. Moisture allows Pectobacterium  populations to increase and potentially infect below the tuber surface and escape further drying.
  3. Moisture on the tuber surface reduces gaseous exchange through the periderm and can result in anaerobic conditions within the tuber. This may result in an increased concentration of reducing sugars.

More …

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Measuring condensation risk

  1. Moisture on the tuber surface may not be visible but can be measured electronically with tuber resistance sensors. This may indicate that condensation is occurring or already occurred.
  2. Dewpoint and resistance measurements may help to identify occasions when there is a risk of condensation occurring.
  3. Use four resistance sensors per 1000 tonne store.

More …

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Disease development during storage

  1. Soil adhering to tubers can reduce the air space between tubers and so affect ventilation in the store.
  2. Soil adhering to tubers may increase the risk of black dot development during storage.
  3. Potential problems can occur during storage after a wet season and wet harvest.
  4. A wet season can increase the risk of a number of diseases which may develop during storage:

Cold, wet conditions at harvest can increase the risk of wounding tubers and transmission of:

More …

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Store hygiene: general principles

  1. Pectobacterium bacteria may be spread by uninfected tubers passing over a contaminated grader.
  2. Graders etc. should be washed down at the end of the day or between handling potatoes from different sources.
  3. Fine dust in stores can include fungal spores.
  4. Avoid spreading dust in stores: minimise traffic in stores and remove dust with a vacuum cleaner.
  5. Surfaces can become contaminated with fungi and bacteria: wash down pallet boxes, walls and floors after emptying the store.
  6. A number of disinfectants are available for use in potato stores: these can help to control fungi and bacteria.
  7. A higher concentration of disinfectant is required to kill Pectobacterium than fungal pathogens.
  8. Higher concentrations of disinfectants are required on concrete than on wood.

More …

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Further information

Storage notes

Storage 2015 (Includes storage diseases)

Storage 1999 (Includes wound healing, hygiene and condensation)

 

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