TY - JOUR
T1 - Spatial pattern of Cercospora leaf spot of sugar beet in fields in long- and recently-established areas
AU - Vereijssen, Jessica
AU - Schneider, Johannes H.M.
AU - Stein, Alfred
AU - Jeger, Michael J.
PY - 2006/11
Y1 - 2006/11
N2 - Spatial disease pattern of Cercospora beticola was characterised during natural epidemics of Cercospora leaf spot (CLS) in sugar beet. We applied linear regression and geostatistical analyses to characterise CLS spatial patterns in three field trials, in long-established and recently-established CLS-areas, during two consecutive years. Linear regression showed a positive influence of average disease severity of within-row neighbouring plants (0.38 < β̂1 < 0.88). Semi-variograms modelled the spatial dependence of disease severity for two directions per week in both years. Disease severity displayed strong spatial dependence over time. The within-row spatial dependence was the largest, but across-row dependence was irregular and weaker. Both long- and recently established areas showed strong spatial dependence of disease severity within row, decrease in variability between years and within the second trial year and a relation between β̂ 1 and the relative nugget. Observed differences were more field than area specific. These spatial and temporal analyses indicated that disease severities of adjacent plants were dependent; hence, we concluded that C. beticola is dispersed mainly over short distances from plant to plant.
AB - Spatial disease pattern of Cercospora beticola was characterised during natural epidemics of Cercospora leaf spot (CLS) in sugar beet. We applied linear regression and geostatistical analyses to characterise CLS spatial patterns in three field trials, in long-established and recently-established CLS-areas, during two consecutive years. Linear regression showed a positive influence of average disease severity of within-row neighbouring plants (0.38 < β̂1 < 0.88). Semi-variograms modelled the spatial dependence of disease severity for two directions per week in both years. Disease severity displayed strong spatial dependence over time. The within-row spatial dependence was the largest, but across-row dependence was irregular and weaker. Both long- and recently established areas showed strong spatial dependence of disease severity within row, decrease in variability between years and within the second trial year and a relation between β̂ 1 and the relative nugget. Observed differences were more field than area specific. These spatial and temporal analyses indicated that disease severities of adjacent plants were dependent; hence, we concluded that C. beticola is dispersed mainly over short distances from plant to plant.
KW - Beta vulgaris
KW - Semi-variogram analysis
KW - ADLIB-ART-2502
KW - EOS
KW - ITC-ISI-JOURNAL-ARTICLE
KW - 2024 OA procedure
UR - http://www.scopus.com/inward/record.url?scp=33749508656&partnerID=8YFLogxK
U2 - 10.1007/s10658-006-9046-z
DO - 10.1007/s10658-006-9046-z
M3 - Article
SN - 0929-1873
VL - 116
SP - 187
EP - 198
JO - European Journal of Plant Pathology
JF - European Journal of Plant Pathology
IS - 3
ER -