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. Jpn. J. Nematol. 33(1), 1-13 (2003).

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Globodera sp. different from G. rostochiensis was detected at one of potato fields in Kotanuka, Shibetsu Town, Nemuro County, Hokkaido on Sep. 16, 1980. This speciesremarkably differed from G. rostochiensis in oval shape and small Granek's ratio (1.7) of cysts, and longer stylet (24μm) with anterior concaved knobs of second stage larvae. This specimen was most similar to Globodera hypolysi detected in Nagasaki Prefecture in morphological characteristics. This was parasitic on mugwort (Artemisia montana), not onpotato, tobacco and yarrow (Achillea millefolium) in this test. From the above results, this specimen was identified as G. hypolysi. This nematode was detected from other four potato fields in the same town, and also from one potato field and sedimentation basin of starch factory in Abashiri City. Jpn. J. Nematol. 33 (1), 14-22 (2003).

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Four new and two known species belonging to the family Qudsianematidae Jairajpuri, 1965 are described and illustrated. Eudorylaimus intermedius sp. n. is characterized byhaving 0.76-0.84mm long body; lip region distinctly offset; large amphids; 10-11gmlong odontostyle; a post-median transverse vulva; distinctly sclerotized pars refringensvaginae; ventrally arcuate tail, and males with three to four ventromedian supplements. E. niaesi sp. n. has 1.85-2.36mm long, slender body; lip region offset by slight depression;small, stirrup-shaped amphids; 19-20μm long odontostyle; distinctly enlarged DN; transversevulva; spherical vagina with well developed pars refringens vaginae; small genitalbranches, and conoid, ventrally arcuate tail. E kyotoensis sp. n. has 1.90-1.96mm long, slender body; lip region offset by depression with projecting labial papillae; largeamphids; 22.5-23.5μm long odontostyle; transverse vulva; pars refringens vaginae small; well developed genital branches, and conoid, ventrally arcuate tail. Paraxonchiumn japonicum sp. n. has 0.66-0.80mm long, robust body; lip region rounded, distinctly offset;large amphids; 20-21gm long, asymmetrical odontostyle with short aperture; pharyngeointestinaljunction with three distinct gland cells; post-median transverse vulva; stronglysclerotized pars refringens vaginae; amphidelphic gonad and short, conoid, almoststraight tail. Ecumenicus monohystera (de Man, 1880) Thorne, 1974 and Mylodiscus nanus Thorne, 1939 are reported here for the first time from Japan. Jpn. J. Nematol. 33(1), 23-40 (2003).

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[in Japanese]

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