1. Agrios, G. N., Plant Pathology, 3rd ed. Academic Press, Inc., New York 1988.
2. Barbosa, P., in: Microbial Mediation of Plant-Herbivore Interactions, p. 341. Eds P. Barbosa, V. A. Krischik and C. G. Jones. John Wiley & Sons, Inc., New York 1991.
3. Krischik, V. A., in: Microbial Mediation of Plant-Herbivore Interactions, p. 309. Eds. P. Barbosa, V. A. Krischik and C. G. Jones. John Wiley & Sons, Inc., New York 1991.
4. White, T. C. R., Oecologia61 (1984) 90.
5. Littau, V. C., and Maramorosch, K., Virology2 (1956) 128.