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Catalogue: GRDC Updates
Long-term monoculture of a susceptible host results an increase in the numbers of microsclerotes in a paddock... Sclerotia of S. sclerotiorum germinate during cool, wet weather and either directly infect the base of plants at ground level or produce fruiting bodies in which ascospores are produced... The finding contrasts with recent work which shows that Fusarium thapsinum and F. andihazi are responsible for most cases of fusarium stalk rot in northern NSW and ...
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Catalogue: GRDC Final Reports
Two other baits containing different toxins offer promise, but will need further data to support their registration... Monitoring on a single transect does not provide an early warning of a plague to a region; farm-based monitoring of mouse abundance in spring can indicate the potential for an outbreak as part of a model that includes past rainfall... Simple monitoring methods need to be better developed and combined with simple models using rainfall to predict future abundance of mice...
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Catalogue: Broadacre Field Crops DAFF QLD
Overwintering pupae describes the winter dormant stage of the helicoverpa pupae... Control of overwintering pupae is achieved through pupae busting - cultivating the soil to a depth of 5-10 cm to reduce survival of pupae... To determine pupal numbers, crops can be sampled prior to harvest by: randomly selecting metre lengths of row searching for emergence tunnels by carefully scraping the top 2-3 cm of soil away with a garden trowel (Emergence tunnels will appear as a small circular hole slightly larger in diameter than a pencil.) digging down carefully into a tunnel to about 10 cm to find the pupa...
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Catalogue: Broadacre Field Crops DAFF QLD
Overwintering pupae describes the winter dormant stage of the helicoverpa pupae... Control of overwintering pupae is achieved through pupae busting - cultivating the soil to a depth of 5-10 cm to reduce survival of pupae... To determine pupal numbers, crops can be sampled prior to harvest by: randomly selecting metre lengths of row searching for emergence tunnels by carefully scraping the top 2-3 cm of soil away with a garden trowel (Emergence tunnels will appear as a small circular hole slightly larger in diameter than a pencil.) digging down carefully into a tunnel to about 10 cm to find the pupa...
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Catalogue: Broadacre Field Crops DAFF QLD
Overwintering pupae describes the winter dormant stage of the helicoverpa pupae... Control of overwintering pupae is achieved through pupae busting - cultivating the soil to a depth of 5-10 cm to reduce survival of pupae... To determine pupal numbers, crops can be sampled prior to harvest by: randomly selecting metre lengths of row searching for emergence tunnels by carefully scraping the top 2-3 cm of soil away with a garden trowel (Emergence tunnels will appear as a small circular hole slightly larger in diameter than a pencil.) digging down carefully into a tunnel to about 10 cm to find the pupa...
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Catalogue: GRDC 2014 Research Summaries
" Understanding the molecular basis for desiccation tolerance of rhizobia for improved survival on seed.. Survival of rhizobia can be poor and varies depending on the rhizobial strain and inoculant formulation... The project will engage with Professor Philip Poole, an expert in rhizobial molecular physiology at the John Innes Centre, Norwich, UK. Professor Poole will facilitate training of project personnel in established techniques for isolation of mRNA from rhizobia and subsequent micro-array analysis...
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Catalogue: GRDC Research Summaries
Survival of rhizobia on seed is generally poor and desiccation is a major factor affecting cell viability... A review of current literature reveals that rhizobia has some inherent mechanisms for desiccation tolerance... Survival of rhizobia after growth in broth cultures was compared with that of cells extracted from peat...
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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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Catalogue: GRDC Publications
H. marinum is widely referred to as sea barley grass around the world, and H. hystrixis known as Mediterranean barley grass... Conditions that favour germination and establishment The seed of common sowthistle can germinate at temperatures in the range 5 C to 35 C. Germination is ultimately determined by moisture availability, as a moist environment is preferred... There is a high proportion of seedling emergence from shallow seed sources, whereas more deeply buried seeds remain dormant and long-lived with a half life estimated at 10 years...
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