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00 11 WilLUT. J. M. S( ud i es on the biolog), pathogenicity and contro! of Che lance nemalode, Hoplolaimus galeatus, on den! corn. Zra mays. (AbstraciJ. Disseriation Abstracts International. B (1983)    44 (6) 1667B [En, Order No

DA8324672] Illinois Univ._t Urbana. USA.

In a greenhouse test, aII cultivars studied supporied reproduction of the nematode. but ihe degrce varied wideł)-. Seven inbreds suppjried morę ncmatodes in roots than did seven hybrids. Yields differed wjdely among hybrids boih on unireated soil and in response to ncmaticlde ireatmenl.

0 0 12 Inserra, R. N.; 0’Bannon, J. H.; Di Vito, M.; 'FERRIS, H. Response of two alfalfa cultitars to Meloidogyne hopla. Journal of Nematology (1983) 15 (4) 644-646 [En, 17 ref.) Ist. Nematol. Agraria, CNR. Bari, Italy.

The relationshiD between the initial densilies of 2 native populations ol M. hopla and lucerne growth was studied in glasshouse experiments in Bari, Italy. and Prosser, Washington, USA, on M. hopla susceptible ’Washoe’ and resistant ¹Nevada Syn XX’ cu!tivars. There was a greater tolerance limit in both cultivars to the halian M. hopla population than to the American population.

^00 1 3WHITE, R. H.; DICKENS, R. Planl-parasitic nematode populations in bermudagrass as influenced by cułtural practices. Agronomy Journal (1984) 76 (I) 41-43 [En, 13 ref.) Department of Agronomy and Soils. Auburn University, AL 36849. USA.

A 3-year study was initiated in Mav 1978 on Dothan sandy loam to determine the effects of N sources, core acrification, vertical mowing, and sand topdressing on nematode populations. Stubby rooi (Trichodorus spp.). ring (Criconemoides Spp.). stunl (Tylencborbynchus spp.). and spiral (Helicotylenchus spp.) nematodes were the principal spp. present. Lower populations occurred where activaied sewage sludge was the source of N than where NH₄NOj was applied. Topdressing. vertical mowjng and core aerification treatmems had no consislenl effects on populations. The grass selection Dothan supported higher populations of stunt and stuooy root ncmatodes but lewer spiral nematodes than did Tifdwarf or Tifgreen. Tifdwarf supported the greatcst ovcrall ncntaiode population.

0014 SaEFKOW, M. [Pathotype imestigalions with populations of H eterodera avenae in maize.)

Palhotypenuntersuchungen mit Populationen von Heierodero ovenoe an mais. Zeitschrift fur Pflamenkrankheiten und Pflanzenschui: (1983)    90 (4) 33/-344 [De, en, 30 ref.J

Institut fur Angewandte Botanik der Univ. Hamburg, Marseiller Strasse 7, D-2000 Hamburg 36, GFR.

H. ovenae pathotype A (Hamburg district,. GFR), pathotype E (Storman district) and pathotype r^iiture C + D (Straubing district. Southern Germany) were studied in the glasshouse and the first two also in field trials. Pathotype A produced the largest numbers of cysts. followed by E and C + D. Ali 11 maize varieties studied became infecled wiłh all 3 pathotypes, vars. Adour, Forla and Primeur being preferred. Additionally, pathotype A ¹gave higher cyst numbers also on vars. Brillant, Limac and Prior, pathotype E also on Anjou 21 and pathotypes C + D also on Limac and Velox. The population levels achieved were of linie importance to all the varieties studied. Pathotype A was the most virulenl: yield losses for A were. for all except 2. over 10%. and for many, over 20%; pathotype E gave a yield reduction of 20% in only 2 cases.

birdsfoot trefoil, red’ clóver, bromegruss, orchardgrass and timothy in glasshouse and field experiments in Canada. P. crenatus did not afTect the yield of any of the bosts although reproduction was good on timothy. P. penetrans reproduced well on legumes and timothy and reduced yields of birdsfoot

trefoi), red clover and lucerne in descending order.

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0016 Pakistan Botanical Socifty Abstracts of papers presented to the lat All Pakistan Cooference of Plant Sclentists, 23-26 Fcbruary 1982, Department of Botany, Unirersity of Karach!. Pakistan Journal of Botany (1982) 14 ((Fcbruary)) 1-50 [En]

Abstracts of papers of nematologica] interest presented at the conference mclude: Studies of some Criconematidae (Nematoda) firom Pakistan associated with fruit plams — by M.A. MaqbóoI; Association of Merlinius brevidens with important crops of Pakistan — M.A. Maqbool, N. Fatima and H. SaJeba; Studies of plant-parasitic nematodes associated with pear (Pyms communis) in Pakistan — M.A. Maqboo! and S. Hashmi; Yariation in plant-parasitic nematode population at various depths and moisture eon tent on o kra planted soil — A. Khan; Effect of interaction between Meloidogync incognita and Rhizobium japonicum on the growth of cowpea — M. Athar, Z. Akbar, A. Mahmood and M.A. Maqbool; An autecological study of anhydrobrosis in some phytoncmatodes — M. Saeed and J. Roessner, Primary plant heaJtb care — nematode-free corms of banana — M. Saeed, S.A. Khan, F. Qamar and H.A. Khan.

00 17 TaRJAN, A. C.; FIUEDEJUCK. J. i. Reaction of' nematode-lufected centipedegrass turf to pesticidal and non-pesticidal treatments. Proceedings of the Florida State Hordcultural Socicty (1981) 94, 225-227 [En, 2 ref.] Univ. of Florida, 1FAS, Entomology & Nematology Dcp., Gainesvilie. FL 32611. USA.

Centipedegrass turf (Eremocbloa ophiuroides) at tbe University of Florida, USA, infected mainJy with Hemicycliopbora parrana and Macropostbonia spbaemcepbala was treated with Ekol leaf mould, Cytex cytokinins, bendiocarb, Seabom kelp-ezlract, phenamiphos-fensuifothion muiture, phenamiphos, ethoprop or etbylene dibroraide. The phenamiphos'fensuifothion muture and ethoprop treatments gave greatcst reduction in nematode numbers. Highest grass yields were obtained with leaf mould, followed by ethoprop and pbenamiphos-fensulfothion muture (respectively 61, 45 and 39%) morę than un treated eon troi plots.

0018 Uoates-Beckjord. P. L. Defelopmental biology ano feeding bebariour of Tylencborbynchus agri oo two bosts, Trifolium prateose and Poa pratensis. Netnatropica (1982) 12 (1) 1-5 [En. es, 12 ref.) Dep. of Bot.. Univ. of the West Indies, Mona. Kingston 7, Jamaica.

Eggs of Tylencborbynchus agri were deposited as a single celi and tbe embryogeny was similar to that of some other Tylencborbynchus spp. At 27¹C eggs hatched 7 days after oviposition and the 2nd-, 3rd- and 4th-stage juveniles and adults were formed at 7. 13, 19 and 25 days respectively after ovipositiou. Nematodes fed ectoparasiticaJly on Trifolium prateose and P. pratensis with oóiy the stylet tip inserted in epidennal cells of the root-hair zonę. The duration of feeding was usually less than 5 min.

0 0 19 GUPTA. D. C. Studies on the pathogenicity and relatire susccpribility of some farieties of cowpea (Vigna nnguiculata L. Walp.) a gai as t Meloidogyne jaraniea.. Forage Research (1979) 5 (2) I41-U5 [En. 13 ref.) Dep. of Nematology, Haryana Agric. Univ.. Hissar 125004. India.

Cowpea cv. HFC 42-1 inoculated with 1000 or 10 000 larvae of M. javanica/5Q0 g of soil showed a significant reduction in heigbt and fresh shoot and root weight. Out of 63 cowpea cv¹. tested. vars. HFC-12. HFC-31I and C-28 92 showed r es is Lance to Af. jaranica.

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0015 WlLLlS, C. D.; KlMPINSKI, J.; rTHOMPSON, L. S. ‘Reproduction of Pratyleacbus crenatus and P. penetrans on forage lęgu mes and grass es and effect on forage yield. Canadian Journal of Plant Pathology (1982) 4 (2) 169-174 [En, fr,14 ref.] Research Sta., Agric. Canada. Charlottetown, Prince Edward Island CIA 7M8, Canada.

The reproduction of P. crenatus and P. penetrans and their effect on forage yield were determined on lucerne.