VG00044 Clubroot – Understanding Risk

Clubroot is the most serious soilborne disease affecting brassicas world wide.

Clubroot is caused by Plasmodiophora brassicae Woronin, an obligate biotrophic parasite.

Australian crop losses are estimated at between 5 and 10% of production.

Clubroot is endemic in most of the major production regions of Victoria, New South Wales and

FACT :  Clubroot management is based on understanding disease risk


Caroline Donald

Ian Porter

Josie Lawrence

Barbara Czernaikowski

Rachel Lancaster

Dean Metcalf

Leigh James

Peter Stephens

Shane Dullahide

VG00044 Clubroot - Understanding disease risk
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Estimating risk:
Disease severity is related to levels of Clubroot in the soil.

Disease risk can be estimated using farm records or by a molecular diagnostic test.

Have you ever seen clubroot on your property?

How large is the area affected?

1. Severity of last observed clubroot infection
2. Time since last observed clubroot infection
3. Intended sowing time for brassicas
4. Have brassica weeds been seen on the site since last infection
5. Intended crop
6. Soil pH
7. Source of planting material
8. Variety
9. Drainage
10. Soil type

Financial support for this research has been provided by: Horticulture Australia Limited, the vegetable
growers R&D levy and Stae Departments of Agriculture.

Thanks to the following growers for their assistance with trial work:

Con Ballan Geoff Cochrane Anthony Mason
David Milburn George Sabo Tony Wright
Sam Calameri Tom Winfield Andrew Doran
Mark Kable Kevin Temple Rod
Michael Camenzuli WU Yue Fang, ZHONE Cai Xia
Ha Sau Ying XIANG Cai Ji Robert Quirks
Dario Semenzin Harslett farms Greg Widderick

Thanks to the following for their technical assistance on the project:

Josie Lawrence Barbara
David Tooke Lisa Gibson
Jenny McGough Christina Bakker
Chang You Pan Kevin Lai
Alison Anderson Glenn Geitz
R. Palmer Kathy
David Richard Duncan Cameron
C. Haase  

Statistical advice by Fiona Thomson and Nam Ky Nguyen (Department of Primary Industries, Vic).

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