take-all with ammonium and chloride fertilizers. Mary Powelson is working with Trevor Bretag on diseases of field peas.

NEW PUBLICATIONS

10th International Congress of Plant Protection 1983

Proceedings of the International Symposium on Phytophthora: Its ,Biology, Ecology and Pathology.

To be held at Brighton, Sussex, England. To be held under the auspices of the International Union of Biological Sciences and organised in conjunction with the British Crop Protection Council. For further information regarding this congress contact Mrs. H. A. Bishop, 144/150 London Rd, Croydon, CR02TD, Surrey, England.

This publication has been available since March 1, 1982. Cost will be $US3.00 in the USA, Canada, and Mexico and $US4.00 to overseas nations. Please make out cheques to: Regents, University of California (for Proceedings/Phytophthora Symposium). Send request to Department of Plant Pathology, University of California, Riverside, CA 92521.

ERRATUM Vol. 11 No.2 pages 15-16, "Torula Yeast: A growth Supplement for Improving Sporulation of Penonospora hyoscyami on Tobacco." by Greg Johnson - the statement "Inoculum prepared as described here contained 500 ~ g/ml, more than adequate for maximum germination" is incorrect and should be replaced by "Inoculum prepared as described here contained 0.5 )J g/ml, less than the requirement for maximum germination (5), so that improved germination per se may not have caused the improvement in sporulation". Vol. 11 No.2 pages 15-16, "Torula Yeast: A Growth Supplement for Improving Sporulation of Peronospora hyoscyami on Tobacco" by Greg Johnson. "Shepherd and Mandryk (5) found that the requirement for maximum percentage germination in vivo was 20 )J g riboflavin/ml" not "20 g/ml" as stated.

Advances in Plant Pathology Vol. 1 Eds. D.S. Ingram and P.H. Williams Academic Press, New York. $US36.00 In this volume there is plenty to interest everyone concerned with plant pathology. It is important, however, that it should be seen from a long-term point of view as part of a flexible and wide-ranging series capable of adapting to serve the needs of plant pathologists and plant pathology. Contents include: JE. Elliston: Hypovirulence N. T. Keen: Specific recognition in gene-for-gene hostparasitic systems JM. Daly and H. W. Knoche: The chemistry and biology of pathotoxins exhibiting host selectivity D.J Merlo: Crown gall: A multipotential disease T.G. Hall, W.A. Miller and J.J. Bu;arski: Enzymes involved in the replication of plant viral RNAs Index

Two illustrations had been omitted from A.A. Paul's article (APP. Vol. II, No.1 pp 9-10). These are reproduced below.

The Rust Fungi Eds. K.J. Scott and A.K. Chakravorty Academic Press, New York, $US50.00 No other comparable volume has been published on the SUbject of host-parasite interaction involving rust fungt and cereal plants. The Rust Fungi is anticipated to fulfill the needs of a broad range of students and researchers in plant pathology, plant physiology, biochemistry, genetics and biology. There are contributions by: S. Sato and Y. Hiratsuka, Morphology and taxonomy of the rust fungi. D.J Maclean, Axenic culture and metabolism of rust fungi. I.A. Watson and R.A. Mcintosh, Genetics of hostpathogen interaction in rusts. G. Wolf, Physiology and biochemistry of spore germination. A.K. Chakravorty and K.J. Scott, Biochemistry of hostrust interactions: (a) Primary metabolism, (b) Intermediary metabolism. M. Heath, Host defense mechanisms against infection by rust fungi. H. Buchenauer, Chemical and biological control of cereal rusts.

Fig. 1. Leaf spots on winter grown borage plants.

Fig. 2. Conidia of Nigrospora oryzae in culture.

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