1. The references cited in this chapter, together with those for Chapter 3, are listed in References – Part I, pages 140–166.
2. Studies on crossing of physiological races of Erysiphe graminis DC. f.sp. hordei Marchal;AL-ANI;Zeitschrift für Pflanzenkrankheiten, Pflanzenpathologie und Pflanzenschutz,1969
3. ALEXANDER, L.J. and HOOVER, M.M. (1955). Disease resistance in wild species of tomato. Ohio Agricultural Experiment Station, Research Bulletin No. 752
4. Physiological specialisation in the tomato wilt fungus Fusarium oxysporum f.sp. lycopersici;ALEXANDER;Journal of Agricultural Research,1945
5. Reaction of F2 seedlings of several crosses of susceptible and resistant wheat selections to Puccinia striiformis;ALLAN;Phytopathology,1970