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factoricUc des correspondances appliąuee a ('influence dc deux nematodes sur la croissancc dc 1'arachide et sa fixatioo symbiotiaue dc 1'azotc. Rewe de Nómatologie (1982) 5 (I) 161-168 [Fr, en, 11 ref] Lab. dc Nćmatol. ORSTOM, BP 1386, Dakar, Senegal.

The num bers of o c mat od es in soil and roots. the oumbers and weights of bacterial nodules, the weights of roots and aerial parta and nitrogen fixation, as determined by the acetylcnc rcauction assay, wcrc recordcd cvcry fortnight during the growth of Arachis infected with Scutclloncma carenessi in Senegal and with Aphasmatylenchus straturatus in Upper Yolta in plots treated with DBPC or left untreated. Factorial analysis demonstrated the relationships between variables and gave a elear er picture of the eventa occuning during a control programme. A marked negative correlation was established for both nematodes between nematode numbers and nitrogen fuation by symbiotic bacteria. The nematode affects the plan ta both directly and indirectly reducing symbiotic nitrogen fization.

0 0 39 PONTE, J. J. Da; SANTOS, C. D. G. [Behariour of □ew Vignm unguiculata hybrids to parasitism by Meloidogyne spp.) Comportamento de novoa hibridos de feijao macassar, Yigna unguic ul a La Walp., cm relaęao ao parasitismo de nematóides daa galhaa, Meloidogyne spp. In Trabalhos apresentados ś VI reuniao Bras ileira de nematologia, 8-12-fevereifO de 1982, FortaJeza. Fublicaęao No.6. (Edilcd by: Lordello. L.G.E) Piraci ca ba, SP, Brazil; Sociedade Brasileira de Nematologia (1982) 27-32 [Pt, en, 5 ref.) Univ. Fed. Ceara, FortaJeza, Brazil.

Of the 5 new hybrids of V. unguiculata tested for resistance to M. incognita, M. javanica, M. arenana and M. bapla, Amelia and Otilia showed resistance while Carmen, Angela and Lianna were moderately susceptible, susceptible and highly susceptible respectively.

00 4 0 Putsa, N. M. [Assessment of the resistance and tolerance of red do?er to the atem nematode.) In Zaschita kormorykh kul’tur ot rrediteld, bo leżu ef i somyakor. (Nauchnye Trudy YASKhNIL). [Chief Editor. Fadeev, Y.N.l Moscow, USSR; “Kolos** (1980) 31-34 [Ru)

Methods used to assess the resistance of red clover vars to Ditylencbus dipsaci in the laboratory and in experimental field conditions in tbe European USSR are described In laboratory tests the resistance index (RJ) of the 8 vars tested ranged from 17.09 to 35.83% with the highest in Tetraploid VUC. In field tests when resistance and tolerance were assessed in 2 consecutive years, Tetraploid VIK showed an RI of 48.47% at the finał assessment and good tolerance. The field RI’s of the olher vars were Iower than those recorded in the laboratory.

0 0 4 1 DaS, P.; PMUKAN, P.. N. Reaction of certain mung cnitiTars to root-knot nematode [Meloidogyne Łncognita). Indian JoumaJ of Nematology (1982) 12 (I) 204-205 [En, 2 ref.) Dep. Zool. & Entomol., Assam Agric. Univ., Jorhat-785013, India.

In a pot experiment, all 17 cultivars of mung tested were susceptible to M. incognita. Cultivar B-l was the least susceptible.

0 0 4 2 RUSHDI, M. H.; SELLAM, M. A.; A3D-ElraZIK* A.; Allam, A. D.; Salem, A. HJstologJcal changes indoced by Meloidogyne jaraniem and Fusmrium tpeciet on roots of selected legumlnoo* plan ta. Egypńan Journal of Phytopathology (1980, pubL 1982) i2 (1/2) 43-47 [En, ar, 19 reL, 6 pL (uopaged)] Dep. of Plant Path., Fac. of Agric.,

Univ. ot Assiut, EgypL

Invasion of M. jaranica alone into roots of broad bcan and cowpea caused much damage to plant tissues and ca used the formation of thick-walled, multinucleate giant cells with granular cytoplasm. Hyperplastic tissues were formed around bypertrophied cells. Roots of broad bcan infected by F. oxysporum or roots of cowpea infected by F. solani alone showed that tbe fungal uivasion was confmed to the 95

epidermis with poor fungal growth m the cortcz. Yascular bundlcs were free from myce li um. Roots infected with both organisms indicated that fungal penetration could be through the epidermis far from the nematode as well as at the nematode point of entry. The fungus grew well in sloughing epidermal cells and xylem vessels. Giant cells were also infected by several fungal hyphae and became devoid of cytoplasm.

00 4 3 NORDMEYER. D. [Studies on a root rot complez in Trifolium subterraneum in north-west Tunisia, with special reference to interactions among the causal agents.J Untersuchungen tiber einen Wurzelfaulekomplex an Trifolium subterraneum L. in Nordwest-Tunesien unter besonderer Beriicksichtigung von Wcchselbcziehungen zwischen den Erregcm. Tbesis, Rbeiniscbe Friedrich- Wilhelms-Umrersitat, Bonn, GFR (1979) I24pp. [De, 13pp. of ref.) From Plant Breeding Abstracts 53 (6), 4894.

00 4 4 Duncan, L. W.; Ferris, H. Yalidation of a model for piedlcdon of host damage by two nematode species. Journal of Nematology (1983) 15 (2) 227-234 [En, 18 ref) Dep. Nematol.,.Univ. Califomia, Riverside, CA 92521, USA.

Plant roots were mechanically injured or subjected to nematode parasitism to test the model of host damage by 2 nematode species: y = ra' + (|-nOc'ZiP||ZjPu for y < 1.0 and y = 1.0 for y > 1.0, where m' = m, + (m_rm,) (l-yi)/ (G-y.) + (l-y,)J and c = (zi *^Ti+ z* ’^ri)/2. Damage functions for greenhouse-grown radish plants (cv. Cheny Belle) mechanically injured with smali or large Steel needles were used to predict growth of plants injured by both needles. Growth predictions accounted for 94%, 37% and 82% of mean treatment variaiion in plant height, stem weighi. and root weight. respectively. Cowpea (cv. Califomia Blackeye No.5) damage functions, based on preplant popuJation levels of Meloidogyne incognita and M. jaranica. were used to predict seed yield of plants concomitantly infected with various leve!s of cach species. Single species damage functions and popuiation growth curves indicated significant host resistance to M. incognita and significantly Iower virulence of that species compared to M. javanica. Model predictions accounted for 88% of mean sced yield vaiation in 2 species Ireatments. In a separate experiment, mean top weights of 30-day-otd cowpea plants, uniformly moculated with 20 000 M. jaraniem eggs, inereased with inereasmg Ievels of concomitantly inocutated M. incognita eggs. It may be that the competitive interactions between M. incognita and M. jaraniem mitigated host damage by the moie virulent species.

00 4 5 OniHiRiN, R. A. Screcning of somc West African cowpeas Vigna unguiculata for resistance to root-knot neinatodes Meloidogyne incognita and M. jaraniem. In Procecdings of the 3rd Research Planning Conferencc on root-knot nematodes, Meloidogyne spp., Regions IV and V, 16-20 Noveniber 1981, Ibadan, Nigeria. (International Meloidogyne Project). Ibadan, Nigeria; International Institute of Tropical Agriculture (1982) 231-238 (En, 10 ref.) Sch. of Biol. Sci., Univ. of Port harcourt, Rivers State, Nigeria.

Of the V. unguiculata lincs from Senegal and Nigeria screened for resistance to 3 races of M. incognita and one race of M. jaranica, onfy linę TVU 857 from Nigeria showed high resistance.

0 04 6 Kjmpinski, i.; El EraKJ, S. Influence of aldlc&rb, carbofuran, propoxur and fenamiphos on actirity of Pratyleochus peaetrans (Cobb) and P. crenatus Loof. Rewe de Nómatologie (1983) 6 (1) 103-110 (En, fr, 36 ref.) Agric. Canada, Res. Sta., P.O. Box 1210, Cbarlottetown, Prince Edward lsland, Canada CIA 7MS.

Aldicarb was morę eUcctive than carbofuran, propozur or fenamiphos in controlling P. penetrans and P. crenatus on timothy and red clover in a pot experiment and in reducing the number of nematodes passing through sand columns. There was a significant interaction between temperaturę.