Herb gardening for beginners by Derek Fell

By Derek Fell

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Fincham, J. R. S. R. Fungal Genetics. Blackwell Scientific Publications, Oxford. Fulton, R. W. Phytopathology 38, 421-8. Gibbs, A. , Harrison, B. , Watson, D. H. and Wildy, P. Nature, Lond 209,450-4. Harrison, B. D. (1964). In Plant Virology (M. K. Corbett and H. D. Sisler, eds). Florida University Press, Gainesville, Fla, pp. 118-47. Hawker, L. E. (1966). Fungi Hutchinson, London. lwanowsky, D. St Petersb. Acad. imp. Sci. BulL 35, 67-70. 18 Vegetable Crop Diseases Mayer, A. E. (1882). Voorloopie Meded.

Gibberellins have been identified in culture filtrates of G. fujikuroi and in the tissues of a wide range of Angiosperms; gibberellin-like substances have been extracted from several Basidiomycetes. Azotobacter chrococcum and Pseudomonas spp. from the rhizospheres of tomato and cucumber plants have the capacity to produce gibberellin-like substances in vitro. Direct evidence for involvement in specific host-parasite combinations is very sparse, resting on studies of G. fujikuroi on rice, the presence of gibberellin A 1 or A2 in thistles (Circium arvense) infected withPuccinia obtegens (rust) and greatly increased levels of gibberellin-like substances in legume roots inoculated with Rhizobium spp.

Waxiness and hairiness may contribute to whether or not an infection is successful. Waxless mutant Brussels sprouts are more heavily infected with Albugo candida (white blister) than normal types. The roles played by the cuticle Invasion, Colonisation and Symptom Development 23 and the epidermal layer in preventing invasion need to be differentiated. Ot great. Generally, pathogens tend to penetrate younger tender parts of the host more easily than the older thickened regions. Attempts have been made to correlate the ease with which penetration can take place with the thickness of the plant cuticle.

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