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ergot infection

Catalogue: Broadacre Field Crops DAFF QLD
Honeydew oozing on a grain sorghum head caused by Claviceps africana (ergot)... Crops at greatest risk are: forage sorghums heads on ratoon crops flowering late in the season tillers on late-flowering plants crops in which pollination has been affected by a cold snap before or at flowering... To minimise the risk of ergot contamination, growers should: sow at recommended times ensure even flowering (use press wheels, high-germination seed, accurate seed depth control; good crop nutrition, wide row spacing (90-100 cm), especially with hybrids that tiller heavily, and consider pre-harvest kill-off of tillers using glyphosate herbicide) graze forage sorghum heavily to delay flowering until after grain sorghum has flowered...
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Catalogue: Broadacre Field Crops DAFF QLD
Honeydew oozing on a grain sorghum head caused by Claviceps africana (ergot)... Crops at greatest risk are: forage sorghums heads on ratoon crops flowering late in the season tillers on late-flowering plants crops in which pollination has been affected by a cold snap before or at flowering... To minimise the risk of ergot contamination, growers should: sow at recommended times ensure even flowering (use press wheels, high-germination seed, accurate seed depth control; good crop nutrition, wide row spacing (90-100 cm), especially with hybrids that tiller heavily, and consider pre-harvest kill-off of tillers using glyphosate herbicide) graze forage sorghum heavily to delay flowering until after grain sorghum has flowered...
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Catalogue: Broadacre Field Crops DAFF QLD
Honeydew oozing on a grain sorghum head caused by Claviceps africana (ergot)... Crops at greatest risk are: forage sorghums heads on ratoon crops flowering late in the season tillers on late-flowering plants crops in which pollination has been affected by a cold snap before or at flowering... To minimise the risk of ergot contamination, growers should: sow at recommended times ensure even flowering (use press wheels, high-germination seed, accurate seed depth control; good crop nutrition, wide row spacing (90-100 cm), especially with hybrids that tiller heavily, and consider pre-harvest kill-off of tillers using glyphosate herbicide) graze forage sorghum heavily to delay flowering until after grain sorghum has flowered...
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Catalogue: GRDC Updates
Although sorghum ergot outbreaks can occur at any time of the growing season, levels in the warmer months are usually low, and manageable.. Claviceps africana , the fungal pathogen which causes sorghum ergot, is now endemic in Australia... Pollen plays a vital role in the biology of sorghum ergot - sorghum flowers which have been pollinated are resistant to infection by the spores, so factors which reduce the availability (eg., rainfall which moves pollen from the air) or viability (eg., night temperatures <15 C before flowering) of pollen can predispose flowering sorghum heads to infection...
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