A positive correlation was obtained between the number of eggs and the total nematodes in roots of native herbaceous plants in Hokkaido, and after 2 years of long-term growth a positive correlation was recognized between the number of eggs in roots and the population density of nematodes in soil. In the above investigations, number of eggs or number of nematodes in the roots were used as an index of the nematode reproduction. The plants that had large numbers of eggs and produced high reproduction of nematodes were Agastashe rugosa, Vicia cracca, Thermopsis lupinoides, Lotus corniculatus var. japonicus, and Iris setosa. The plants that were not suitable as a host were Patrinia scabiosifolia, Lysimachia clethroides, Astilbe odontophylla, and Eupatorium makinoi. The rate of nematode population decline on the native species of P. scabiosifolia was superior to the cultivated variety "Wase Ominaeshi". The efficacy depended on the number of eggs in roots. Long term cultivation of Rudbeckia laciniata led to a meager population of nematodes. Rudbeckia hirta also showed a superior reduction of nematodes, as shown in a previous report. Jpn. J. Nematol. 37 (2), 75-86 (2007)
Suppressive effect of rye cultivation on soil populations of the northern root-lesion nematode, Pratylenchus penetrans (Cobb) In a pot test with soil infested with the northern root-lesion nematode, Pratylenchus penetrans, conducted to examine nematode development in plant root tissue and nematode populations in soil, no nematode eggs were found in the root tissues of 7 cultivars of rye and triticale among 35 cultivars tested. In a spring seeded experiment, 5 of the 7 cultivars which had no nematode eggs in root tissue were grown for 2 months from the end of May in nematodeinfested field plots. The experiment was repeated twice in two successive years with each year having a different population level of 92 and 52 nematodes/25 g of soil, respectively. A nematode suppressive effect was found in the "BILBAO" and "WIANDI" plots, but the effect was lower than that in the control plots planted with a commercially available antagonistic plant, Avena strigosa "Hay oats". Proportions of marketable radish grown after rye for two successive years were respectively 43% and 73% in the "BILBAO" plot, 3% and 30% in the "WIANDI" plot, and 100% for both years in the A. strigosa plot. In the autumn seeded experiment, rye plants were grown from 27 September to 12 June the following year in nematode-infested field plots (45 nematodes/25 g of soil) with or without a fungicide application for snow mold control. The nematode Pf/Pi ratios were 10% for "SBR601" (newly tested breeding line), 23% for BILBAO" and 24% for "WIANDI" in the plots where crop growth was protected by the fungicide application. Proportions of marketable radish grown after rye were 90% in the "SBR601" plot, 60% in the "BILBAO" plot and 67% in the "WIANDI" plot. The suppressive effect on nematode populations was found to be higher in "SBR601" than in the other two cultivars. Nematol. Res. 39(1), 31-43 (2009).
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