Field trials to evaluate maleic hydrazide
application timing on sprout formation established in Matamata and Hawke’s Bay
have been completed. Evaluation of tubers for sprout formation and vigour has
shown no effect of maleic hydrazide in these trials. This highlights the
importance of application timings and environmental conditions at application
for effectiveness.
Data on fungicide resistance of Rhizoctonia and the efficacy of fungicidal treatments has been collected. Preliminary data suggests Amistar and pencycuron treatment can reduce black scurf regardless of whether inoculum is tuber- or soil-borne. This effect is increased when the fungicide treatments are used together. However, none of the strategies for chemical treatment completely control the diseases caused by Rhizoctonia. This may be due to the inability of the two fungicides tested to completely abolish growth of R. solani (as shown by plate assays).
Field trials to evaluate strategies to manage Rhizoctonia are being repeated to ensure the preliminary findings are consistent. Molecular diagnostics established in the project continue to be used in the field trials to study in more detail the influence of different management strategies on tuber- and soil-borne inoculum and how this might affect disease incidence and severity.
Data on fungicide resistance of Rhizoctonia and the efficacy of fungicidal treatments has been collected. Preliminary data suggests Amistar and pencycuron treatment can reduce black scurf regardless of whether inoculum is tuber- or soil-borne. This effect is increased when the fungicide treatments are used together. However, none of the strategies for chemical treatment completely control the diseases caused by Rhizoctonia. This may be due to the inability of the two fungicides tested to completely abolish growth of R. solani (as shown by plate assays).
Field trials to evaluate strategies to manage Rhizoctonia are being repeated to ensure the preliminary findings are consistent. Molecular diagnostics established in the project continue to be used in the field trials to study in more detail the influence of different management strategies on tuber- and soil-borne inoculum and how this might affect disease incidence and severity.
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