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ISHS Acta Horticulturae 555: II International Symposium on Edible Alliaceae

PROGRESS TOWARDS AN INTEGRATED CONTROL STRATEGY FOR ONION WHITE ROOT ROT DISEASE, INCLUDING THE USE OF ARTIFICIAL GERMINATION STIMULANTS

Author:   J. Dennis
Keywords:   Sclerotium cepivorum, diallyl disulphide, tebuconazole, Folicur, Eucalyptus, resistance, density, avoidance
DOI:   10.17660/ActaHortic.2001.555.14
Abstract:
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.

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