Uso di specie biocide nel contenimento di patogeni soil-borne

This paper reports the results of research conducted in 2002 aimed at evaluating agronomic behaviour, in terms of growth and biomass production, of different "break-crops" and the level of control of a number of soil borne diseases determined by their amendment. Two localities in Calabria, San Marco Argentano and Melito Porto Salvo, were chosen to study the growth dynamics of the above-mentioned species, and in the latter, the influente of green manure of the same species on the soil borne fungal pathogens Fusarium, Verticillium and Phytophthora. A high growth rate, considerable expansion of the leaf area and high biomass production was observed in all species. Sinapis alba cv Concerta and Frankie and Brassica juncea cv Isci 20 produced a higher quantity of biomass than the other treatments. The presence of Verticillium spp. And Phytophthora spp. in the soil at Melito Porto Salvo was found to be negligible while the average number of Fusarium spp. colonies, isolated before sowing, was equal to 38.6 g-1 dry soil. Two months after amendment, the number of pathogen colonies had increased in all treatments. The ineffectiveness of the amendments on Fusarium spp. could be attributed to a reduced susceptibility of the fungus to the type of isothiocyanates released by the species used in the research.

In due località della Calabria, è stato studiato il comportamento agronomico, in termini di accrescimento e produzione di biomassa, di alcune specie biocide. In una delle due località è stata, inoltre, valutata l'influenza del sovescio delle suddette specie sulla possibilità di contenimento di alcuni patogeni fungini del suolo. Sotto il profilo agronomico, tutte le specie hanno mostrato una notevole adattabilità garantendo un'elevata produzione di biomassa da sovesciare. il loro interramento è risultato, tuttavia, inefficace nei confronti di Fusarium spp.