By A. B. R. Beemster, G. J. Bollen, M. Gerlagh, M. A. Ruissen, B. Schippers, A. Tempel
This quantity features a selection of the entire papers offered on the founding convention of the eu origin for Plant Pathology, held from twenty sixth February to 2d March 1990 at Wageningen, The Netherlands. It focusses at the topic of ''Biotic Interactions and Soil-Borne Diseases'', on which there are contributions from top eu scientists within the box of soil-borne ailments. methods of exploiting biotic methods and phenomena which bring about plant construction innocuous to the surroundings are explored
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Additional info for Biotic Interactions and Soil-Borne Diseases
Combinations of species belonging to the three categories were very effec tive, suggesting that mutual predation did not reach such a level that myco phagous activity was hampered. , 1986; Schölte, 1 9 8 7 ) . A study on the cause of this phenomenon conducted by Hofman (1988) provided substantial evidence for the hypothesis that the increased incidence of R. solani was due to a reduction of soil fauna feeding on the infection structures of the pathogen. The first components of soil fauna to be affected by nematicides are, of course, the nematodes.
Avenae were several times higher in the direct vicinity of subterranean parts of the potato plant than in the soil beyond it. In its pre-infection phase, R. solani grows ectotrophically over the surface of the subterranean stem. After formation of infection cushions, structures consisting of a dense mycelium with short swollen cells, the pathogen penetrates the subterranean sprouts. As has been observed by Hofman and Jongebloed (1988), the size of the lesions that are formed upon infection of the sprouts is proportional to the size of these infection cushions.
Some data concerning the presence and behaviour of springtails (Collembola) on grass and white clover. Neth. J. , 70: 136-141. , 1985. Earthworms. Their ecology and relationships with soils and land use. Academic Press Sydney, 411 pp. Luxton, M. , 1982. Survey of the main animal taxa of the detritus food web. Oikos, 39: 293-294. , 1976. ) Gisin (Collembola), Family Onychiuridae). Rev. Biol. , 13: 353-364. T. , 1971. Interactions between a springtail, HypogasCrura tulbergi and soil-borne fungi. J.