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K. Sitaramaiah and R.A. Sikora

gelatinous matrix was delayed and fewer eggs per egg sac were produced on plants with mycorrhiza. Data showed that G. fasciculatus adversely affects R. reniformis during several phases of its life cycle. Keywords : nematode-fungus interactions, vesicular arbuscular mycorrhiza. INTRODUCTION Vesicular

J. DODD, J. KRIKUN and J. HAAS

REFERENCES Allen M.F. Moore T.S. Christensen M. Phytohormone changes in Bouteloua gracilis infected by vesicular-arbuscular mycorrhiza. I. Cytokinin increases in the host plant. Can. J. Bot. 1980 58 371 374 Atkinson D. Some general effects of phosphorus deficiency on growth and development

Zaki A. Siddiqui and Irshad Mahmood

fungicides on the non-target pathogen, Sclerotium rolfsii Phytopathology 1975 65 773 776 Bagyaraj D.J. Manjunath A. Reddy D.D.R. Interaction of vesicular arbuscular mycorrhiza with root-knot nematodes in tomato. 1979 51 397 403 Plant Soil Cook R.J. Baker K.F. The nature and practice of biological

R.N. Inserra, G.S. Santo and J.H. O'Bannon

initial population densities on alfalfa growth in pots containing a geometric progression of nematode-numbers. Plastic pots containing 430 ml of methyl-bromide sterilized river sand, artificially infected with 1.3 spores per ml of vesicular arbuscular mycorrhiza Glomus epigaeus Daniels & Trappe, were

M.R. Siddiqi and J. Klingler

growth in pots containing a geometric progression of nematode-numbers. Plastic pots containing 430 ml of methyl-bromide sterilized river sand, artificially infected with 1.3 spores per ml of vesicular arbuscular mycorrhiza Glomus epigaeus Daniels & Trappe, were inoculated with 0, 0 . 25 , 0 . 50, 1 , 2

H. Saleh and R.A. Sikora

. REFERENCES ATILANO, R. A., MENGE, J. A. & VAN GUNDY, S. D. (1981). Interaction between Meloidogyne arenaria and Glomus fasciculatus in grape. Journal of Nematology 13, 52-57. BAGYARAJ, D. J., MANJUNATH, A. & REDDY, D. D. R. (1979). Interaction of vesicular-arbuscular mycorrhiza with root-knot nematodes in

Al-Sayed Al-Sayed and Hosny Kesba

. Dr Ahmed A. Farahat for reviewing the manuscript and Wafaa M. Ali for her help during the chemical analysis studies. References A HMED , S.S. & A L -S AYED , A.A. (1991). Interaction between the vesicular-arbuscular mycorrhiza, Glomus macrocarpus and Meloidogyne incognita infecting cowpea. Annals of

H.M. Saleh and R.A. Sikora

-knot nematode on soybean. Phytopathology 70, 293-296. MENGE, J. A. (1982). Effect of soil fumigants and fungicides on vesicular-arbuscular fungi. Phytopathology 72, 1125-1132. MOSSE, B. (1973). Advances in the study of vesicular-arbuscular mycorrhiza. Annual Review of Phytopathology 11, 171-196. O'BANNON, J. H

Hagen Hass, Hans Kerp and George Poinar

) and developing arbuscules of vesicular arbuscular mycorrhiza (Remy et al ., 1994), are preserved. These indicate that preservation must have occurred very quickly, within hours or even less. Recent radiometric dating of these deposits provide an age of 396 ± 12 million years (Pragian), which is well

R. Duponnois and A.M. Ba

., DUPONNOIS, R. & DIOP, M.T. (1995). Influence des facteurs telluriques abiotiques et de la plante hôte sur l'infection des nématodes phytoparasites du genre Meloidogyne par l'actinomycète parasitoïde Pasteuria penetrans. Agronomie 15, 581-591. MOSSE, B. (1973). Advances in the study of vesicular-arbuscular