Global: Leak and Pink Rot Risk Rises When Potatoes Are Lifted Above 18°C Pulp Temperature
కీ టేకావేస్
- 65°F (18.3°C) pulp is the harvest limit for leak risk
- 36 hours can be enough for leak symptoms in hot tubers
- 50°F (10°C) pulp temperature halts the leak pathogen
- 40°F (4.4°C) in store makes the pink rot pathogen inactive
ఇది ఎందుకు ముఖ్యమైంది
- రైతుల కోసం
- Check tuber pulp temperature with a probe before and during lifting; stop when it reaches 18°C and restart in the cool morning hours
- ప్రాసెసర్ల కోసం
- Ask for pulp temperature at loading on intake notes for fields lifted in warm weather and segregate high-risk loads
- సరఫరాదారుల కోసం
- Offer growers simple probe thermometers and cooling advice with harvest-time fungicide or phosphite programmes
60-సెకన్ల సారాంశం
Harvest timing by thermometer is the cheapest defence against two water-borne tuber rots. Guidance from Maine and California converges on one number: do not lift when tuber flesh is at 65°F, about 18°C, or warmer. Above 25°C the leak organism grows fast, and symptoms may appear within a day and a half of lifting. Cooling below 10°C stops leak, while the pink rot organism goes dormant below about 4°C. Pink rot also depends on waterlogged soil, so irrigation that leaves fields saturated before harvest adds to the danger. Wounds are the entry point for leak, which links this risk to harvester settings and skin set. Late September lifting in the north and early crops in warm regions are most exposed. Rotting tubers can wet healthy ones and invite bacterial soft rot. The fungicide advice cited here follows Californian labels and must be checked against national registrations before use.
Leak and pink rot are two tuber diseases that often start at harvest. Leak is caused mainly by the soil organism Pythium ultimum. Pink rot is caused by Phytophthora erythroseptica. Both enter tubers in wet soil and both do most damage in warm crops.
University of Maine Cooperative Extension advises growers to avoid harvesting when tuber pulp temperature is 65°F or higher. That is about 18.3°C. The UC Statewide IPM Program in California gives the same limit for pink rot. It advises against harvesting tubers with pulp temperature above 65°F.
How fast leak develops
Leak symptoms appear when tuber pulp temperatures reach 65°F, according to the Maine bulletin. The fungus grows rapidly above 77°F, or 25°C. At high pulp temperatures, infected tubers can show leak in as few as 36 hours. The disease is halted below 50°F, or 10°C.
వారపు రోజులు. ఒక్క క్లిక్తో సభ్యత్వాన్ని రద్దు చేసుకోండి.
Leak needs a wound to enter. Brown, water-soaked lesions form around wounds. Inside, the flesh turns into a dark, watery rot. In late stages only a hollow shell remains, and pressure releases a clear to brownish liquid. The spores can survive in soil for many years. The Maine bulletin notes that Pythium does not spread well from tuber to tuber in storage.
Pink rot and wet soils
The pink rot pathogen becomes active when soil is saturated with water, according to UC IPM. Growers should avoid prolonged saturation during irrigation. In store, the fungus is inactive below 40°F, or 4.4°C.
UC IPM lists fungicide timing for pink rot at flowering and again 14 days later. It also describes applications 2 and 4 weeks before harvest. Fungicides in groups 1, 4, 9, 11 or 17 should get no more than one application before rotating to another mode of action. Phosphite can be applied after harvest at 0.1 gallon per ton of tubers.
ఇది ఎందుకు ముఖ్యమైంది
Many Northern-hemisphere crops are still being lifted in late September. Warm afternoons and wet fields create the exact conditions for these rots. Lifting in the cool morning hours can keep pulp temperature below the limit.
A few rotting tubers can wet their neighbours and open the door to bacterial soft rot. A probe thermometer in the field is a low-cost tool. It helps decide when to start and stop the harvester each day.
Photo: Potato tubers inoculated with the pink rot pathogen in a laboratory study (illustrative). He Jiang, Hye Weon Hwang, Tongling Ge, Barbara Cole, Brian Perkins, Jianjun Hao / వికీమీడియా కామన్స్, CC BY 4.0
గ్లోబల్ పొటాటో బ్రీఫ్
ప్రధాన ఐదు వార్తలు, ధరలు, వ్యాధి హెచ్చరికలు మరియు ఈవెంట్లు. వారపు రోజులలో ఉదయం, ప్రకటనలు ఉండవు.
సోర్సెస్
- University of Maine Cooperative Extension — Bulletin #2446, Potato Leak — https://extension.umaine.edu/publications/2446e/
- UC Statewide IPM Program — Pink Rot, Potato Pest Management Guidelines — https://ipm.ucanr.edu/agriculture/potato/pink-rot/
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