|Author: ||J. Dennis|
|Keywords: ||Sclerotium cepivorum, diallyl disulphide, tebuconazole, Folicur, Eucalyptus, resistance, density, avoidance|
The control of onion white root rot (OWRR) has been demonstrated to be most successful when an integrated management strategy is adopted.
Disease incidence was reduced from 58% in early sown high density onions grown without fungicide application, to 0.3% in late sown low density onions grown with a single fungicide application.
Differences in disease incidence of up to 70% have been recorded between cultivars.
A degree of control with a fungicide treatment was demonstrated using Folicur-treated Lime Super which was drilled with the seed.
An artificial germination stimulant, diallyl disulphide (DADS), has been incorporated into the soil and reduced sclerotia populations, and has resulted in a 45% reduction in disease levels.
Integrating the fungicide treatment with DADS treatment, has resulted in the production of a commercially acceptable crop, reducing disease levels from 75% to 11% and increasing yield from 15t/ha to 44t/ha when compared to onions grown in untreated soil and without fungicide application.
Another control option being investigated is the use of Eucalyptus leaf mulch which has shown a very high level of control in pot studies.
Download Adobe Acrobat Reader (free software to read PDF files)
URL www.actahort.org Hosted by KU Leuven