Powder scab

The powder scab is a disease of the potato . It is caused by the Cercozoa pathogen Spongospora subterranea f. sp. subterranea causes. Powder scab occurs in most potato growing regions around the world.

Symptoms and Biology

Powder scab occurs mostly in damp growing areas and in wet years. The spores can survive in the soil for several years. However, it is mainly spread through infected seed tubers. The infection can also occur via roots and stolons . The infected areas contain dark spore material under the cracked bark . Ultimately, small "corky" indentations are created, surrounded by torn pieces of skin. The tubers are badly deformed, rot easily and can hardly be used for fodder purposes. The pathogen can be the carrier of the Mop-Top virus , which causes necrosis inside the tubers .

Combat

In susceptible growing regions (e.g. Scotland, Scandinavia) long crop rotations must be observed (at least 5 years). The risk of infestation can also be minimized by choosing healthy seedlings and less susceptible varieties. The dressing of the planting material and the chemical treatment of the soil can also be carried out to control the disease. To waterlogging -prone soils should for potato cultivation dewatered (drained) are.

literature

Horst Börner, Plant diseases and plant protection , 7th edition, UTB 518, Verlag Eugen Ulmer, Stuttgart 1997, ISBN 978-3-8252-0518-8 .

Web links

Powder scab (ETH Zurich) ( Memento from June 15, 2013 in the Internet Archive )

Individual evidence

↑ Arne Schwelm, Julia Badstöber, Simon Bulman, Nicolas Desoignies, Mohammad Etemadi: Not in your usual Top 10: protists that infect plants and algae: Protists in plant pathology . In: Molecular Plant Pathology . tape 19 , no. 4 , April 2018, p. 1029-1044 , doi : 10.1111 / mpp.12580 , PMID 29024322 , PMC 5772912 (free full text) - ( wiley.com [accessed May 2, 2020]).
↑ ^a ^b U. Merz, RE Falloon: Review: Powdery Scab of Potato — Increased Knowledge of Pathogen Biology and Disease Epidemiology for Effective Disease Management . In: Potato Research . tape 52 , no. 1 , February 2009, ISSN 0014-3065 , p. 17–37 , doi : 10.1007 / s11540-008-9105-2 ( springer.com [accessed May 2, 2020]).

[1] Arne Schwelm, Julia Badstöber, Simon Bulman, Nicolas Desoignies, Mohammad Etemadi: Not in your usual Top 10: protists that infect plants and algae: Protists in plant pathology . In: Molecular Plant Pathology . tape 19 , no. 4 , April 2018, p. 1029-1044 , doi : 10.1111 / mpp.12580 , PMID 29024322 , PMC 5772912 (free full text) - ( wiley.com [accessed May 2, 2020]).

[:0-2] U. Merz, RE Falloon: Review: Powdery Scab of Potato — Increased Knowledge of Pathogen Biology and Disease Epidemiology for Effective Disease Management . In: Potato Research . tape 52 , no. 1 , February 2009, ISSN 0014-3065 , p. 17–37 , doi : 10.1007 / s11540-008-9105-2 ( springer.com [accessed May 2, 2020]).