Factors affecting the development and control of black dot on potato tubers

JL Brierley*, AJ Hilton, SJ Wale, JC Peters, P Gladders, NJ Bradshaw, F Ritchie, K MacKenzie, AK Lees

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Field trials were carried out over a 4 year period (2004–2007) to determine the effect of agronomic factors, specifically cultivar resistance, irrigation, crop duration and chemical control (in-furrow application of azoxystrobin), on black dot development on potato tubers grown in fields where soilborne inoculum of Colletotrichum coccodes was present. In 2004, 2005 and 2006, two field trials were performed each year and in 2007, 19 mini-field trials were carried out across Scotland and England. Cultivar resistance was clearly demonstrated to be an effective method of reducing black dot disease severity on tubers (described here as the percentage of unmarketable tubers, i.e. those with symptoms covering a surface area of >10%). In the four field trials carried out in 2004 and 2005, in irrigated and fungicide-untreated plots, 43 8% of tubers of cv. Maris Piper were unmarketable, compared with 17 0% of tubers of cv. Sante. Assessments of disease development on underground plant parts (stems, stolons and roots) revealed that cultivar resistance acted only at the tuber level, as disease symptoms on other parts were often high irrespective of published disease resistance ratings. Irrigation increased the severity of disease on tubers in two trials (England 2004 and 2006), but its effect was less significant when rainfall was high. Delaying harvest by 2 weeks increased disease severity in all six trials, whilst application of azoxystrobin consistently reduced black dot severity. There were significant interactions between factors. The results clearly show how black dot disease severity can be reduced through an integrated approach to disease management.
Original languageEnglish
Pages (from-to)167 - 177
Number of pages11
JournalPlant Pathology
Volume64
Issue number1
DOIs
Publication statusFirst published - 5 Jun 2014

Fingerprint

Solanum tuberosum
tubers
potatoes
disease severity
field experimentation
England
signs and symptoms (plants)
Plant Stems
Piper
Colletotrichum
irrigation
Colletotrichum coccodes
Plant Roots
Disease Resistance
R Factors
Scotland
stolons
cultivars
chemical control
furrows

Keywords

  • Azoxystrobin
  • Black dot
  • Colletotrichum coccodes
  • Crop duration
  • Disease management
  • Irrigation

Cite this

Brierley, JL., Hilton, AJ., Wale, SJ., Peters, JC., Gladders, P., Bradshaw, NJ., ... Lees, AK. (2014). Factors affecting the development and control of black dot on potato tubers. Plant Pathology, 64(1), 167 - 177. https://doi.org/10.1111/ppa.12238
Brierley, JL ; Hilton, AJ ; Wale, SJ ; Peters, JC ; Gladders, P ; Bradshaw, NJ ; Ritchie, F ; MacKenzie, K ; Lees, AK. / Factors affecting the development and control of black dot on potato tubers. In: Plant Pathology. 2014 ; Vol. 64, No. 1. pp. 167 - 177.
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Brierley, JL, Hilton, AJ, Wale, SJ, Peters, JC, Gladders, P, Bradshaw, NJ, Ritchie, F, MacKenzie, K & Lees, AK 2014, 'Factors affecting the development and control of black dot on potato tubers', Plant Pathology, vol. 64, no. 1, pp. 167 - 177. https://doi.org/10.1111/ppa.12238

Factors affecting the development and control of black dot on potato tubers. / Brierley, JL; Hilton, AJ; Wale, SJ; Peters, JC; Gladders, P; Bradshaw, NJ; Ritchie, F; MacKenzie, K; Lees, AK.

In: Plant Pathology, Vol. 64, No. 1, 05.06.2014, p. 167 - 177.

Research output: Contribution to journalArticle

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AU - Hilton, AJ

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AU - MacKenzie, K

AU - Lees, AK

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Brierley JL, Hilton AJ, Wale SJ, Peters JC, Gladders P, Bradshaw NJ et al. Factors affecting the development and control of black dot on potato tubers. Plant Pathology. 2014 Jun 5;64(1):167 - 177. https://doi.org/10.1111/ppa.12238