The Potato Tuber Disease Occurrence as Affected by Conventional and Organic Farming Systems

Tein, Berit; Kauer, Karin; Runno-Paurson, Eve; Eremeev, Viacheslav; Luik, Anne; Selge, Are; Loit, Evelin
December 2015
American Journal of Potato Research;Dec2015, Vol. 92 Issue 6, p662
Academic Journal
A study was conducted which aimed to investigate the effect of farming systems (FS) (four conventional with increasing mineral N fertilizer amounts 0-150 kg of N ha) vs. two organic with catch crops (CC) and cattle manure (CC + M)) under the same five crop rotation system on the occurrence of tuber diseases such as common scab ( Streptomyces spp.), silver scurf ( Helminthosporium solani), dry rot ( Fusarium spp.), and soft rot ( Pectobacterium spp.). As the average of the first rotation years 2009-2011, the FS had a significant effect on the occurrence of silver scurf, dry rot and common scab (surface cover <30 %). The organic systems had significantly more tubers (around 39 %) infected with common scab (surface cover 4-15 %) than in conventional systems (around 25 %). However, when the surface lesion severity increased (surface cover 16-30 %) then differences occurred only between organic systems (in system Organic CC 4.1 % and in system Organic CC + M 13.1 % of tubers infected). The Organic CC system had significantly fewer tubers infected with silver scurf compared to all conventional farming systems (10.5 % vs 17.8-23.4 %). During the first and after the second disease measurement there were less tubers infected with dry rot in Organic CC (0.8-0.9 %) and conventional N high (0.5-1.4 %) systems compared to N low (1.8-3.0 % of tubers infected) system. Soft rot infections were not influenced by farming systems. Thus we conclude that it is possible to influence the occurrence of some tuber diseases with FS.


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