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fumieation with recommcnded rates of DD or DBCP sreallv inereased crop yields following sesbania. sorcnum. ana weeds but produccd only smali inereased following hairy indigo.

0 109 Sundaresh. H. N.: Setty. K. G. H.: Govindi . H. C. Integrated contro! of root knot nematode (Aleloióogync incognita Chitwood). Mvsorc Journal of Aericultural Science* (1977) 11 (4) 540-543 (En) Dep. of' PI. Path.. LAS. Bangalore-560 024. India.

In Bangalore. India. Zea mays var. Seneca was resistant to Mcloidogyne incognila and when used in rotation with tomato and chilli caused a significant reduction in nematode reproduction and development. Abclmoschus eseulentus var. Pusa Sawani was susceptible to root-knot and inereased egg production on a test crop in rotation experimcnts. Under both rotations, carbofuran and oil cake together caused the greatest reduction in nematode reproduction and deve)opment on a tomato test crop. Chilli roots were almost completely free from infestation under both rotations

0200 Britain, Rothamsted Exper»mental Station Report for 1977. Part 1. Harpenden, Herts, UK; Lawes Agncultural Trust. (1978) 348 pp. (En, [Plant nematology pp.

53-54, 66. 68, 100, 126. 128, 155-156. 171-191. 298])

Research reported from the Nematology Department includes the following: the first rccorded occurrence in England of Hcterodcra hordccalis, Pratylcnchoides ritteri and Paratylcnchus bukowinensis: estimation of the quantity of sap extracted from plant cells by Ditylcnchus dipsaci when feeding and the ultrastructure of its anterior alimentary tract: fceding behaviour of Longidorus caespiticoJa: identification of pathotypes of Globodera pallida in Britain (3 known ones.

Pal. Pa2 and Pa3 confirmed and a new one recognized): identifteation of potato cyst nematodes (PCN) from the Nilgiri Hills, India, as mainly G. pallida with some G. rostochicnsis: reaction of 19 European PCN populations to a potato clone with gene Hj: the morphology of 131 PCN populations from South America (good separation of the 2 Globodera species was obtained using certain measurements of 2nd-stage juveniles and certain environmental factors were shown to influence their body and stylet lengths): mating tests between individuals of the 2 PCN species from English and Peruvian populations: comparison of water uptakc by PCN-tolerant and -intolerant potato varieties infected with G. rostochicnsis: relation between transfer cells and sex of G. rostochicnsis in tomato. indicating doubt on the environmental determination of sex: efTect of temperaturę on the development of the 2 PCN species indicating that G. pallida is better adapted to rełatively Iow soil temperatures: hatching of G. rostochiensis as affected by osmotic stress and ion transport: prescnce of fungi in Hctcrodcra avenac and of rickettsia-like organisms in H. goettingiana, H. glycincs and

G.    rostochiensis where they have been observed in eggs. 2nd-stage juveniles males and females: Chemical control of Ditylcnchus dipsaci in Vicia faba (leafless pea and Lupinus albus. though attacked. appear to be poor hosts of D. dipsaci). Nematicide tests reported include the use of formalin and aldicarb in soil where H. avenac cysts are infected by fungi: post-harvest numbers of eggs were 50% fewer where no formalin was applied. Numerous potential nemalicides were tested against G. rostochicnsis on potato in pot and field experiments. A successful technique for incorporating nematicide granules in field soil using a vertical band distnbutor was developed. Oxamyl was tested for control of

H.    goettingiana on peas. oxamyl and aldicarb for H. schachtii on sugar bcet and aldicarb for Ditylcnchus dipsaci on onion. Ob$ervations were madę on the parasitism of Pratylcnchus spp. on oilseed rape, on the life history and morphology oł Angiostoma limacis in slugs and on the occurrence ol mermithids in leather jackets in Wales. Attempts to use Neoaplcctana carpocapsae in the field for control of insect pests of seedling sugar beet showed some promise. in other departments at the Station. obsenations were madę on Docking disorder of sugar bcet, on Pratylenchus spp. on Vicia faba (4 species present with P pinguicaudatus in larger numbers than usual) on Pratylcnchus spp. on maize (7.000/1

soil), on leaching and degradation of oximecarbamate 113 nemalicides in a sandy soil (pH 7.0, organie matter 1.4%) and the same soil modified by peat over several years (pH 6.0, organie matter 6.0%).

0201 Northern Ireland. Department of AGRtCULTURE Annual Report on research and technical work, 1977. Belfast. Northern Ireland. (1978?) xxii + 263 pp. (En, Plant nematology pp. 47-50. 102]

Research reported includes experiments for contro! of Globodera rostochicnsis on potato using oxamyl and aldicarb: nematode multiplication rates in plots were 2.5 X with oxamyl at 4.0 kg a.i./ha, 2.2 X with aldicarb at 2.5 and 4.0 kg a.i./ha and 22 X in untreated plots. In the laboratory. silage efTluent dclayed hatching from Globodera cysts. Sodium hypochlorite solution (1% available chlorinc) failed to kill all cyst contents when infected tubers were dipped in it. Tests with a number of potato varieties and seedlings for resistance to cyst nematodes showed that seedlings 8806 A25 was almost completely resistant to pathotypes Ro I and Pa 1 but susceptible to Pa 3: 5 other seedlings showed various degrees of resistance to pathotypes Pa I and Pa 3. Techniques for the tests are discussed. Work on clover cyst nematode [Heterodera trifolii] includes a technique for determining soil infestation by estimating hatachable larvac in materia! floated from soil, confirmation of hatch stimulation by pea root leachatc and comparison of its action with that of flavianic acid and zinc chloride. Aldicarb and oxamyl applied to clover infected with cyst nematode inereased dry matter yield. when dosage was not too high. and reduced numbers of nematodes. but the results suggested that nematodes were not the main factor limiting clover yield in infested soil. In pot tests Anguina tritici caused typical symptoms in 4 sclections of Triticale. This is thought to be the first record of A. tritici on Tnticale.

0202    Furstenberg, J. P.; Heyns, J. The effect of cultiration on nematodes. Part I. RotylencboJus parno. Phytophylactica (1978) 10 (3) 77-80 [En, af, fr] Plant Protection Research Institute, Private Bag XI34, Pretoria 0001, South Africa.

The efTect of cultivation on the indigenous nematode populations was studied on a virgin loamy soil, using three treatments, maize, cowpeas and natural vegetation (control), for 3 succcsawe years. The efTect of a monoculture of these treatments was determined at 2 soil depths, 0 to 25 and 25 to 40 cm. The dominant plant parasitic nematode was RotylenchuJus parvus and intra- as well as inter-seasonal fluctuations were observed. Population peaks occurred in October and March of each season. Nematode populations built-up greatly in maize plants, while cowpeas inhibited development

0203    Ingram, e. G._; Rodriguez-KAbana. R. Susceptfbllity of plgeon pea to plant parasitic nematodes.

Diviaion Mectings, 1977. Abstract No. C-13. Procccdings of the American Phytopathologicai Sodcty (1977, publ. 1978) 4, 177 [En) Botany & Microbiol, Dep. Aubum Univ., Aubum, AL 36830, USA.

Seeds of pigeon pea (Cajanus cajan) were planted in 10 cm diam. pots containing 500 g of field soil known to comain plant parasitic nematodes. Plants were maintained in the glasshouse (27-32*Q. Eight weeks after planting, soil samples were collected for nematode anaiysis. The roots were examined for galls caused by root knot nematodes and were then ineubated for 72 hours in water, sufficient for coverage, to determine the number of endoparasitic nematodes. Pea roots in a sandy ioam from a soybean field did not show any galling by Mcloidogyne incognita: however, nematode densities (number/g fresh root) in the roots were: 2.5 larvae of M. incognita,    9.5 Pratylcnchus bracbyurus, 8.8

Tylenchorhynchus cJaytoni, and 32.7 Hoplolaimus gaJcatus. Soil populations (50 cm^J soil) were: 2.7 larvse of Af. incognita, 155.5 T. claytoni, 6.1 H. gaJcatus, and 2.2 Trichodorus christiei. Roots of plants grown in loamy sand from a cotton field did not have galls from Af. incognita but evidenced the following nematode densities in roots: 1.5 larvac of Af. incognita, 161.0 P. seribneri, and 27.1 HcJicotylencbus dihystera. Soil populations were: 44.7 H.