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concentranons, in the cotyledons at the 4 lowcr concentrations and in ‘ La h on tan' buds and coryle-dons at the 2 lowest concencrations.

*0632-FAULKNER, L. R. & BOLANDER, W. J., 1970. “Agriculturally-poLluted irrigation water as a source of plant-parasitic oematode infescation." J. Nematol., 2 (4), 368-374.

Experimems werc madę to determine the infective-ness of plant nematodes introduced to a arop in irrigation water. Crops of lucernę, bcan, egg plant (Solanum melongena), peppcnnint, sugar-beet and wheat were grown during the 3-year experiment in scrcenhouscs on soil initially fumigated with mcchyl bromide and watered with canal water (contami-nated) or deep-well water (oematode free). Crops were grown under normal commercial conditions of pianting and nutrition but at temperatures 6 to 9°C. above field conditions. Samples were taken from the fumigated soil before plaming, at 2 weekly intervals during the growing season and monthly for the remaining periods. Large numbers of seyeral genera of nematodes were found in soil samples from most crops irrigated with canal water and vcry few in those irrigated with well water. Paratylenchus was dominant on all crops ejccept egg-pLant, wherc Meloidogyne was dominant. Extrcmely high levels of Paratylerichus on both well—and canal—watered peppermint were ąttributed to aerial contamination. Absence of Dityltnchus dipsaci, known to be prcsent in canal water, was probabiy due to the higher screcnhouse temperatures.

*06 3 3-ABDÓN GUlNEZ, S., 1969. “Transmisión de nematodos fitopatógenos por semiUas de forrajeras.’¹ Agricultura tłc., 29 (3), 139-141.

Ditv/enchus dipsaci was found in 3 of 24 samples of lucemc secd and in one of 11 samples of clover (Tń/ołium prattme) secd. Meloidogyne larvae were also found in seed samples of luceme and clover.

0634.yADAV, B. S. & VERMA, A. C., 1971.

“Cereal cyst celworm and other nematodes

associated with maize in Rajasthan." Indian J.

Nematol., 1 (i), 97-98.

The following species of plant-parasitic nematodes were found associated with tnaize in Rajasthan, India (the percentage of their occurrence in soil samples is given in parentheses):    Heterodera

atenae (46); Pratylenchus zeae and P. delattret (72), Tylenchorhynchus mashhoodi (48), Helicotyl-enchus spp. (14), Hoplolaimus indicus (26), and Rotylenchulus reniformis (4). In addidon, Aphtlen-chus atenae, Diiylenchus sp. and TyUnchus sp. were prcsent in 82, 62 and 2% respectively of the samples examined. Prcliminary pathogenicity tests indicate that Heterodera atenae causes as much damage to maize as it does to wheat and barley.

*0 6 3 5-HUNT, O. J„ GRIFFIN, G. D., MURRAY, J. J., PEDERSEN, M. W. & PEADEN, R. N., 1971. “The effeets of root knot nematodes on bacteria! wilt in alfalfa.” Phytopaihology, 61 (3), 256-259.

The incidence of bacterial wilt infeedon inereased significantiy (7 to 76%) in luceme piants inoculated with a combination of Meloidogyne hapla and Corynebacterium insidiosum compared with those inoculated with C. insidiosum alone.

Heierodcridae), a cyst-forming nematode on Zea mays.'¹ Nematologica, Ycar 1970, 16 (4), 511-516. [German summary p. 515.)

Heterodera zeae n.sp. from the roots of maize in Rajasthan State, India, is described and figured. It belongs to the H. schachtii group with ambifenestrate type of vulval region. The 2nd-stage larvae are closest co those of H. Itspedezae but are shorter (360 to 440 li compared wilii 400 to 510 p.) and have shorter tails (c-=8 to 13 compared with 7 to 9). It is disdnguished from H. glycims by host rangę, cyst mcasurements and the reladvely shorter tarval taił. Barley is also a host. It was also colleaed from maize fields in Pusa, Bihar and Ludhiana, Punjab.

0 6 3 7-DASGUPTA, D. R. & SESHADR1, A. R., 1971.    “Ra ces of the reniform nematode,

Rotylenchulus reniformis Linford and Olivcira, 1940.“ Indian J. Nematol1 (1), 21-24.

Two races of Rotylenchulus reniformis oecame evident when 10 populations of this nematode species were testoJ using cowpea (Vigna catjang), casror, and cotton as hosts. 9 populaciuns (Race A) reproduced on a!l the 3 hosts, but one populacion (Race B) muitiplied on cowpea oniy and failed co reproduce on castor and cotton.

0 6 3 8-TARTE, R.,    1971. “Evaluation of the

damage caused by Pratylenchus zeae in eona under greenhouse conditions.¹' [Abscract.J Nema-troptca, 1 (1), 16 [Also in Spanish p. 36.)

[Negari^e correladon between nematode density and dry wcight of aerial pans of host.]

0 6 3 9 -CORNELISSE, A., MARKS, F., TOWNSHEND, J. L., OLTHOF, Th. H. A. & POTTER, J. W., 1970. “Plant-parasidc nematode genera associated with crops in Ontario in 1969." Can. PI. Dis. Suro., 50 (3/4), 104-105.

The commonest plant-parasitic nematode genera found in Ontario, Ca nada, in 1969 in soil samples from 28 crops were Pratylenchus and Paratylerichus in 177 and 86 samples respecdvely from 17 crops, and Meloidogyne in 16 samples from 9 crops. Heterodera atenae is a pocenual danger to com and crop rotauon is necessary to control it.

0 64 0-SOUTHARDS, C. J., 1971. “Effect of fali dllage and selected hosts on the populadon density of Meloidogyne incognito and Pratylenchus zeae.” PI. Dis. Reptr, 55 (1), 41-44.

The effeets of aurumn ploughing, fallowing and selected hosts on the populadons of Meloidogyne incognito and Pratylenchus zeae were investigated. Plots were ploughed to depths of 15 or 30 cm. and pianted with tobacco or maize in the following spring aft er normal fertiiizadon and cultivadon procedures. Few weeds grew until August when the fallow plots became covered in crab grass (Digitaria sp.). Although the populadon of M. incognito laryae was reduced by 73% compared with undlled plots in che following April, this . reducrion did not persist into the 2nd year. Tobacco crops gready inereased the populadon of M. incognito whilst little inerease occurred in maize crops. P. zeae inereased on maize crops but did not feed on tobacco. There was little inerease in nematode numbers on fallow plots.

*0 6 4 1 ELGIN, J.H., JR. 5 EVANS, D.W.;

175 FAULKNER, L.R. Evaluation of alfalfa for

1

Oh 36 KOSHY, P. K., SWARUP, G. & SETHI, .C. L., 1971. “Heterodera zeae n.so. (Ncmatoda: