Occurrence of fusarium head blight on oats in brazil and evaluation of damages
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OCCURRENCE OF FUSARIUM HEAD BLIGHT ON OATS IN BRAZIL AND EVALUATION OF DAMAGES PowerPoint PPT Presentation


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OCCURRENCE OF FUSARIUM HEAD BLIGHT ON OATS IN BRAZIL AND EVALUATION OF DAMAGES. José A. Martinelli Department of Fitossanidade Federal University of Rio Grande do Sul Brazil. How it looks like?. How it looks like?.

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OCCURRENCE OF FUSARIUM HEAD BLIGHT ON OATS IN BRAZIL AND EVALUATION OF DAMAGES

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Occurrence of fusarium head blight on oats in brazil and evaluation of damages

OCCURRENCE OF FUSARIUM HEAD BLIGHT ON OATS IN BRAZIL AND EVALUATION OF DAMAGES

José A. Martinelli

Department of Fitossanidade

Federal University of Rio Grande do Sul

Brazil


How it looks like

How it looks like?


How it looks like1

How it looks like?


Occurrence of fusarium head blight on oats in brazil and evaluation of damages

FHB on oats is a recent disease in Brazil and we believe it is a consequence of the no till system and the huge increase of inoculum.


However there was not enough information about the losses that this disease may impose

However, there was not enough information about the losses that this disease may impose.


Occurrence of fusarium head blight on oats in brazil and evaluation of damages

So, this work reports the potential loss it might cause on a number of genotypes under South American condition.


Layout

With fungicide

With FHB

Without fungicide

Yield loss

With fungicide

Without FHB

Without fungicide

Layout:


Method

  • 15 genotypes tested

  • Six plots each

  • At flowering: 3 were treated and 3 untreated

  • After, 150 panicles from each plot were marked with and without symptoms.

  • In the Lab. each panicle was hand threshed having their healthy and diseased spikelets separated and weighted.

Method:


Main results

  • Effect of fungicide on panicle´s weight.

  • Effect of FHB on panicles´ weight of treated plants.

  • Potential Yield (PY).

    • PY= weight of healthy spikelets/number of healthy spikelets*total number of spikelets (PY=WHS/NHS*TNS)

  • Observed Yield (OY).

    • OY = weight of healthy plus diseased spikelets (OY=HS+DS)

  • Yield Loss (YL).

    • YL = PY - OY

Main results:


Concluding remarks

  • FHB can cause a significant yield loss on oats.

  • This effect is clearer on treated plots, probably due to the absence of other diseases, such as crown rust and leaf blight.

  • So far, no resistance was found in the genotypes tested.

Concluding remarks


Occurrence of fusarium head blight on oats in brazil and evaluation of damages

Many thanks,

particularly to Prof. Marcelo Pacheco for this presentation.

JAM is a member of the Oat Research Team, since 1992 and works mainly with crown rust.


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