Three field experiments were conducted in Piedmont (NW Italy) in 2001-2002 and 2002-2003, to evaluate the effect of fungicides on Fusarium head blight (FHB) control, yield, deoxynivalenol (DON) concentration in grain and alveographic parameters of flour. The treatments included seed dressing, a single applications of prochloraz, tebuconazole or tebuconazole-azoxystrobin at the mid anthesis stage and two fungicide applications at the shooting stage (prochloraz) and at the mid anthesis (prochloraz, tebuconazole and tebuconazole-azoxystrobin) according to the manufacturer's recommended doses. Two winter wheat varieties were compared in order to evaluate the different degrees of head blight susceptibility: cv. Serio, classified as susceptible and cv. Guadalupe, classified as moderately resistant. The seed dressing with tebuconazole did not reduce the FHB incidence. The treatment with triazole fungicides, carried out at mid anthesis, led to a 52% reduction of incidence, a 48% reduction in DON concentration in the grain, and a 20% increase in yield. The two active triazole substances that were used, prochloraz and tebuconazole, proved to be equally effective in reducing the infection and did not result in any notable difference in the yield or DON contents in the grain. The double treatment carried out at the end of shooting and then at anthesis did not show any substantial advantage over the single treatment at anthesis, for all the evaluated parameters. The trials treated with a mixture of triazoles and strobilurin, though offering positive yields (+8% compared to treatments with triazoles) and showing a lower symptomatology of the pathogen (a reduction of 80% in incidence of FHB compared to the untreated control), led to a DON content which was often higher than the untreated control in the wetter conditions. The alveographic analyses, carried out to evaluate the bread-making quality, did not show any correlation with the level of FHB or the fungicides applications.

Strategies for the chemical control of Fusarium head blight: effect on yield, alveographic parameters and deoxynivalenol contamination in winter wheat grain

BLANDINO, Massimo;REYNERI, Amedeo
2006

Abstract

Three field experiments were conducted in Piedmont (NW Italy) in 2001-2002 and 2002-2003, to evaluate the effect of fungicides on Fusarium head blight (FHB) control, yield, deoxynivalenol (DON) concentration in grain and alveographic parameters of flour. The treatments included seed dressing, a single applications of prochloraz, tebuconazole or tebuconazole-azoxystrobin at the mid anthesis stage and two fungicide applications at the shooting stage (prochloraz) and at the mid anthesis (prochloraz, tebuconazole and tebuconazole-azoxystrobin) according to the manufacturer's recommended doses. Two winter wheat varieties were compared in order to evaluate the different degrees of head blight susceptibility: cv. Serio, classified as susceptible and cv. Guadalupe, classified as moderately resistant. The seed dressing with tebuconazole did not reduce the FHB incidence. The treatment with triazole fungicides, carried out at mid anthesis, led to a 52% reduction of incidence, a 48% reduction in DON concentration in the grain, and a 20% increase in yield. The two active triazole substances that were used, prochloraz and tebuconazole, proved to be equally effective in reducing the infection and did not result in any notable difference in the yield or DON contents in the grain. The double treatment carried out at the end of shooting and then at anthesis did not show any substantial advantage over the single treatment at anthesis, for all the evaluated parameters. The trials treated with a mixture of triazoles and strobilurin, though offering positive yields (+8% compared to treatments with triazoles) and showing a lower symptomatology of the pathogen (a reduction of 80% in incidence of FHB compared to the untreated control), led to a DON content which was often higher than the untreated control in the wetter conditions. The alveographic analyses, carried out to evaluate the bread-making quality, did not show any correlation with the level of FHB or the fungicides applications.
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M. BLANDINO; L. MINELLI; A. REYNERI
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/9398
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