. Eiiti YAMADA2, Ken HASHIZUME2, Minoru TAKAHASHI2, Mieko KITASHIMA3, Seiji MATSUI3 and Hideki YATSU3.Parasitism of Meloidogyne incognita, M. arenaria, Pratylenchus penetrans and P. coffeae was examined on five hybrid sorghum, other four gramineous plants (guineagrass, oat, sudangrass, Italian ryegrass) and crotalaria. Of all strains and plants examined, the sorghum strain SS701 named Tuchitaro was the most effective as an antagonistic green manure plant for the control of M. incognita and M. arenaria but not of P. penetrans and P. coffeae. Jpn. J. Nematol. 30 (1/2): 18-29 (2000).

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Antagonistic effect of leguminous green manure crops on Heterodera glycines and the effect of these crops on Pratylenchus penetrans. Eiiti Yamada, Ken Hashizume and Minoru Takahashi1.The infestation of Heterodera glycines (SCN) (race 1) was observed in 14 leguminous crops tested by pot. When dividing development of infested SCN in the root, percentage of females and cysts was very low (0-1.4%) in the following crops. That is five species of clover (red clover, crimson clover, persian clover, white clover and alsike clover), alfalfa, Crotalaria spectabilis, resistant soybean (Suzuhime) derived from the Peking line, Crotalaria juncea, blue lupine and wooly-pod vetch. The nematode population in the soil after the cultivation of these crops declined greatly.Field test was carried out at Mukawa SCN (race 1) infested field (120 eggs/g dry soil). The density of SCN eggs declined to about 5 eggs after three months cultivation from May 16th of red clover, crimson clover, wooly-pod vetch and resistant soybean (Suzuhime), but they increased the density of Pratylenchus penetrans. The cyst index of susceptible soybean (Suzumaru) as aftercrop of red clover, crimson clover, wooly-pod vetch and resistant soybean (Suzuhime) was lowered. Soybean yield was 130-140 kg/10 a of dry matter after crimson clover, wooly-pod vetch and resistant soybean (Suzuhime), but 80 kg/10 a at red clover, 24 kg/10 a at wild oats (Avena strigosa), 30 kg/10 a at susceptible soybean (Suzumaru). Crimson clover, wooly-pod vetch and resistant soybean (Suzuhime) were selected as antagonistic plant of SCN.

Inoculation test was conducted to confirm the influence of Pratylenchus penetrans on the infection of adzuki bean by Phialophora gregata f. sp. adzukicola, causal agent of brown stem rot of adzuki bean, in the green house. It was considered that high densities of P. penetrans enhanced the invasion of P. gregata f. sp. adzukicola to adzuki bean and the ratio of the highest brownish node to total nodes of adzuki bean. From the result, P. penetrans was clarified as one factor which enhanced the invasion of P gregata f. sp. adzukicola to adzuki bean. Jpn. J. Nematol. 35(2), 71-77 (2005). Key words: brown stem rot of adzuki bean, fungus-nematode interaction, Phialophora gregata f.sp. adzukicola, Pratylenchus penetrans.

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