Effect of pre-planting treatments of nematicides and fungus Paecilomyces lilacinus on root-knot nematode Meloidogyne incognita infecting seed rhizomes of ginger
1995
Montree Iemwimangsa
Yield loss of ginger caused by root-knot nematode, Meloidogyne incognita, was found to be approximately 33.09 percent. Pre-planting treatments with nematocides and fungus Paecilomyces lilacinus on nematode infecting seed rhizomes of ginger were carried out in the field trials at Loey province. Soaking the rhizomes with oxamyl at rate of 48 mg/20 l before planting reduced the yield loss to 7.44 percent; meanwhile P.lilacinus at 23.2*10*[8) spores/plant and carbofuran at 0.06 g/plant reduced the yield loss to 9.62 and 20.78 percent respectively. Dazomet showed biocidal effects on gingers and nematodes when applied at planting. Population dynamics of M. incognita in soil were investigated by measuring the second-stage juveniles emerging from rhizomes every month. The number of the juveniles increased from 4 to 410 juveniles/500 g soil within the first three months and decreased thereafter. Several third and fourth stages of M. incognita embedded in rhizome-knots. Second stage juveniles in the rhizome surface served as a source of nematode inoculum. Scanning electron microscopy of the male heads illustrated them as M. incognita Survival of P. lilacinus in ginger soils at harvesting as measured by colony forming units decreased from 6.15*10*[5) cfu/g to 5.55*10*[3) cfu/g soil within 15 months.
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