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    The effect of seed moisture content and the duration and temperature of hot water treatment on carrot seed viability and the control of Alternaria Radicina

    Merfield, Charles; Hampton, John G.; Hill, Murray J.; Wratten, Stephen D.
    Abstract
    Hot water treatment of seeds to control seedborne pathogens is an important tool for organic seed production. Reducing seed moisture content may have the potential to increase carrot (Daucus carota L. var. sativus D.C.) seed tolerance to treatment. Two hot water seed treatment experiments were conducted. The first studied the effect of seed moisture content (SMC), treatment temperature and treatment duration on germination. Maximum safe treatment temperature and durations were established at 50°C and 30-40 min. Germination decreased slightly from 68% at 5% SMC to 63% at 20% SMC (LSD 1.2) for all durations. The second experiment studied the effect of initial SMC and treatment durations on infestation of seed by Alternaria radicina and seed germination. Treatment at 50°C for 30 min for all SMC compared to the control resulted in a decrease in A. radicina infestation from 69.2 to 1.7%. Reducing SMC from 20 to 5% for all durations resulted in a small decrease in infestation from 25% to 18% (LSD 1.5). Reducing SMC to 5% prior to hot water treatment may be a commercially viable means of minimising reductions in seed viability and decreasing fungal infestation levels.... [Show full abstract]
    Keywords
    carrot; Daucus carota; seed; Alternaria radicina; hot water treatment; germination; seed moisture content
    Date
    2005
    Type
    Conference Contribution - Published (Conference Paper)
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    • Department of Pest Management and Conservation [646]
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    Citation
    Merfield, C. N., Hampton, J., Hill, M. & Wratten, S. (2005). The effect of seed moisture content and the duration and temperature of hot water treatment on carrot seed viability and the control of Alternaria Radicina. Researching Sustainable Systems: First Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR), 21-23 September 2005. Adelaide, Australia: International Society of Organic Agriculture Research (ISOFAR).
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