Plant Protect. Sci., 2017, 53(3):159-168 | DOI: 10.17221/181/2015-PPS

Spatial distribution of cabbage root maggot (Delia radicum) and clubroot (Plasmodiophora brassicae) in winter oilseed rape crops in the Czech RepublicOriginal Paper

Vojtěch Hlavjenka1, Marek Seidenglanz*,1, Aleš Dufek2, Hana Šefrová3
1 Department of Plant Protection, Agritec Plant Research, Ltd., Šumperk, Czech Republic
2 Agriresearch Rapotín, Ltd., Vikýřovice, Czech Republic
3 Department of Crop Science, Breeding and Plant Medicine, Faculty of Agronomy, Mendel University in Brno, Brno, Czech Republic$2

The amount and spatial distribution of plants afflicted with cabbage root maggot (Delia radicum; CRM) and clubroot (Plasmodiophora brassicae) in winter oilseed rape crops were assessed in the Olomouc region (Northern Moravia, Czech Republic) over the course of 2012-2014. A total of 16 commercial rape fields were included in the assessments. Plants with tumours showed a significantly lower (P < 0.001) level of infestation induced by CRM (24% of plants infested) compared to plants without tumours (37% of plants infested). According to a generalised linear mixed model, plants with thicker hypocotyls are predisposed to significantly higher levels (P < 0.001) of root surface damage induced by CRM. The correlation analysis indicates rather weak or intermediate levels of correlation between the two variables (hypocotyls thickness × root surface damage induced by CRM). Both CRM and clubroot symptomatic plants showed a significant tendency for aggregation in rape crops, but not in all cases. Distributions of CRM and clubroot symptomatic plants were either significantly spatially dissociated or not associated in crops. Ovipositing D. radicum females showed some tendency to avoid zones with higher number of plants infected by P. brassicae. Distributions of CRM and hypocotyl thickness levels were significantly spatially associated in crops in several cases.

Keywords: within-field distribution of pests in crops; spatial associations between pests in crops; Integrated Plant Management; control of insect pests; winter oilseed rape diseases

Published: September 30, 2017  Show citation

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Hlavjenka V, Seidenglanz M, Dufek A, Šefrová H. Spatial distribution of cabbage root maggot (Delia radicum) and clubroot (Plasmodiophora brassicae) in winter oilseed rape crops in the Czech Republic. Plant Protect. Sci. 2017;53(3):159-168. doi: 10.17221/181/2015-PPS.
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