Hutton, Dave G.
Author Affiliation, Ana.
Growth and bearing of nematode-infested yellow yam dipped in household disinfestants
Nakatani, Makoto; Komaki, Katsumi
Potential of root crops for food and industrial resources
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Nematodes cause a dry rot in the skin of yam (Dioscorea spp.) planting materials (heads) which invades and can destroy primordia, limiting sprouting, plant vigour and bearing. The heads may be disinfested by dipping in hot water or nematicidal solutions, but there are disadvantages to either treatment. In several trials, household disinfectants used as alternatives, were as effective as oxamyl or hot water to suppress Pratylenchus coffeae and the dry rot affecting yellow or negro yam (D. cavenensis or D. rotundata) heads and to encourage more vigorous and productive plants. In a current trial, dipping yellow yam heads in oxamyl or hot water, or Jeyes Fluid, Dettol antiseptic or bleach, household disinfectants, caused significant suppression of P. coffeae populations after one day; the oxamyl, hot water and Jeyes Fluid treatments were most effective. Five weeks after planting, 50% of the Jeyes Fluid-dipped heads had sprouted compared with over 70% of the hot water-dipped heads and 66% or so of otherwise-treated heads. At 16 weeks, 99% of Dettol-dipped heads had sprouted compared with 90% of control heads and 96% or so of the other treatments. At 10 weeks, leaves of the control plants were significantly smaller, and vines somewhat shorter than those of other treatments at 11 and 17 weeks. Plants from the oxamyl-and bleach-dipped heads bore the greatest weight of tubers.The household disinfectants are proving to be good alternatives to oxamyl or hot water for disinfesting yam planting material of noxious nematodes, and are now recommended provisionally.....