Literature Cited

l. Harris, R.J.C. 1964. Techniques in Experimental Virology. Academic Press, London. 450 pp.

2. Johnson, L.F. and Curl, E.A. 1972. Methods for Research on the Ecology of Soil-Borne Plant Pathogens. Burgess Publishing Company, Minneapolis, USA. 247 pp.

3. Southy, J.F. 1970. Laboratory Methods for Work with Plant and Soil Nematodes. Her Majesty's Stationery Office, London. 148 PP.

4. The Commonwealth Mycological Institute. 1974. Plant Pathologist's Pocketbook. Lamport Gilbert Printers, Reading, Berks. 267 pp.

5. Vanderplank, J.E. 1968. Disease Resistance in Plants. Academic Press, New York. 206 pp.