, Volume 127, Issue 4, pp 465-481
Date: 24 Apr 2010

Soil type, management history, and soil amendments influence the development of soil-borne (Rhizoctonia solani , Pythium ultimum ) and air-borne (Phytophthora infestans , Hyaloperonospora parasitica ) diseases

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The impact of soil type, long-term soil management, and short-term fertility input strategies on the suppressiveness of soils against soil-borne (Ocimum basilicumRhizoctonia solani, Lepidium sativumPythium ultimum) as well as air-borne (Lycopersicon esculentumPhytophthora infestans, Arabidopsis thalianaHyaloperonospora parasitica) diseases was studied. Soils from field trials established in five European sites with contrasting pedo-climatic conditions were examined. Sites included (i) a long-term management field trial comparing organic and conventional farming systems (DOK-trial, Therwil, Switzerland) (ii) a short-term fertility input field trial comparing mineral and organic matter fertilisation regimes (Bonn (BON), Germany) (iii) two short-term fertility input field trials (Stockbridge (STC) and Tadcaster (TAD), UK) comparing the impact of farmyard manure, composted farmyard manure, and chicken manure pellet amendements and (iv) soil from a site used as a reference (Reckenholz (REC), Switzerland). Soil type affected disease suppressiveness of the four pathosystems signficantly, indicating that soils can not only affect the development of soil-borne, but also the resistance of plants to air-borne diseases at relevant levels. Suppressiveness to soil- and air-borne diseases was shown to be affected by soil type, but also by long-term management as well as short-term fertility inputs.