Methods for Sampling and Assessment in Relation to the Spatial Pattern of Phoma Stem Canker (Leptosphaeria maculans) in Oilseed Rape - Archive ouverte HAL Access content directly
Journal Articles European Journal of Plant Pathology Year : 2004

Methods for Sampling and Assessment in Relation to the Spatial Pattern of Phoma Stem Canker (Leptosphaeria maculans) in Oilseed Rape

(1) , (2) , (3) , (4) , (1)
1
2
3
4

Abstract

A sound assessment of phoma stem canker symptoms is needed to develop epidemiological, agronomical and physiological studies on the pathosystem. A specific analysis was therefore carried out to: (i) compare four methods of crown canker assessment; (ii) test the among and within assessor repeatability of one of the methods compared; (iii) characterise the spatial pattern of the disease; and (iv) define the sample size required to achieve a given level of disease assessment precision. The methods compared examined the symptoms with different procedures and graded the plants observed into six severity classes. A disease index (DI) summarised the severity distribution observed. Examination of crown cross-sections was the most precise method for assessing crown cankers. The method was repeatable, though an 'assessor effect' was apparent. The disease generally had a random pattern although significant spatial correlations were detected for four out of the fifteen plots studied at the scales examined. A relationship between the coefficient of variation of the DI and the sample size was established, evaluated with experimental field data and exemplified for typical severity distributions.
Fichier principal
Vignette du fichier
Aubertot et al EJPP 2004.pdf (207.09 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01363609 , version 1 (07-10-2019)

Identifiers

Cite

Jean-Noël Aubertot, Jean-Jacques Schott, Annette Penaud, Hortense Brun, Thierry Doré. Methods for Sampling and Assessment in Relation to the Spatial Pattern of Phoma Stem Canker (Leptosphaeria maculans) in Oilseed Rape. European Journal of Plant Pathology, 2004, 110 (2), pp.183-192. ⟨10.1023/B:EJPP.0000015359.61910.3b⟩. ⟨hal-01363609⟩
91 View
162 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More