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Repeated Applications of a Nonpathogenic Streptomyces Strain Enhance Development of Suppressiveness to Potato Common Scab

Hiltunen, L H; Kelloniemi, J and Valkonen, J P T (2017) Repeated Applications of a Nonpathogenic Streptomyces Strain Enhance Development of Suppressiveness to Potato Common Scab. Plant Disease, 101 (1), pp. 224-232.

[thumbnail of Hiltunen_potato scab_2017_PDIS-07-16-1020-RE.pdf] PDF - Published Version - English


Potato scab caused by several Streptomyces spp. is an important disease with no effective methods of control. Suppressiveness against common scab can develop in soil as a result of long-term monoculture and has been associated with nonpathogenic Streptomyces spp. To determine whether the development of scab suppressiveness could be enhanced, the effect of repeated antagonist Streptomyces strain on common scab was investigated in a long-term field trial over 5 years. Streptomyces strain 272 applied annually at planting consistently suppressed development of common scab symptoms. On scab-susceptible potato cultivar Bintje, strain 272 reduced disease severity, on average, by 43 %; whereas, on the scab-tolerant Nicola, the strain reduced both disease incidence and severity, by 43 and 59%, respectively. Regardless of disease pressure, the combined use of strain 272 and the tolerant cultivar reduced the scab coverage to a negligible level. After a single application of strain 272, efficient disease suppression did not persist in the soil to the following growing season. However, when strain 272 was applied in three or more consecutive years, the soil remained suppressive to scab for at least 2 years beyond the last application, suggesting that, with repeated applications, it may be possible to enhance development of scab suppression in soil. Organic potato cultivation is based on the natural suppressiveness of plant diseases instead of using chemical pesticides.

EPrint Type:Journal paper
Keywords:suppressiveness, nonpathogenic Streptomyces strain, potato common scab, plant disease, soil
Agrovoc keywords:
plant diseases
Subjects: Crop husbandry > Crop health, quality, protection
Research affiliation: Finland > Luke Natural Resources Institute > Ecological Production
Finland > Univ. Helsinki
Deposited By: Autio, Ms. Sari
ID Code:35203
Deposited On:02 Apr 2019 13:07
Last Modified:02 Apr 2019 13:11
Document Language:English
Refereed:Peer-reviewed and accepted

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