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scald

Catalogue: GRDC Updates
A new crop of conidia can be produced within 5 to 7 days leading to rapid spread up the canopy when conditions are favourable... The paper presents only the details and results of Trial #1 - Hermitage 2010... Ten randomly selected plants per plot were marked and on 5 dates leaves in the lower, middle and upper third of the canopy were assessed for % leaf area infected...
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Catalogue: GRDC Updates
Pt is a major constraint due to: the large impact on yield and economics when intolerant varieties are grown, broad geographic distribution with Pt populations frequently at above threshold levels and the susceptibility ( Pt hosting) of key rotation crops such as chickpeas... A total of 45 different varieties of the major winter cereal and broadleaf cropping options were evaluated in nine individual split plot trials... The trial was planned to allow a sound scientific evaluation of the impact of Pt on the yield of a broad range of winter crops and varieties and subsequently to measure the crop impact on Pt population (ie rotational impact and fit)...
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Catalogue: GRDC Updates
Adult plant resistance (APR) This form of resistance is not effective at the seedling stage but increases in effectiveness as the plant develops... Some resistance genes are affected more by temperature... Adult plant resistance and problems with variety disease ratings Because APR is controlled by different minor genes that operate through different mechanisms, the growth stage at which the resistance is expressed and the environmental conditions under which it is best expressed vary from one variety to another...
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Catalogue: Ground Cover
Extra land clearing negates organic expectations.. Madeline attended the 17th International Reinhardsbrunn Symposium on Modern Fungicides and Antifungal Compounds in Freidrichroda, Germany... Addressing the challenges that agriculture is facing in endeavouring to increase productivity while minimising climatic impact, ADAS researchers examined the mechanisms by which fungal pathogens of wheat affect net greenhouse gas (GHG) emissions...
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Catalogue: GRDC Final Reports
Over the three-year course of the project, a total of 3,386 barley lines were evaluated in 24,155 assays... In 2006, the project was inundated with requests from barley breeders, and our facilities were used to capacity for this purpose throughout 2006, with 520 lines and a total of 12,480 plants assayed, and 61 lines (1,464 assays) into 2007... All seedling tests in this project were performed using a set of four specific isolates with characteristic pathotypes on the barley differential set...
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Catalogue: GRDC Research Summaries
One or more species of RLN (Root Lesion Nematode, Pratylenchus spp.) occur in at least 60% of WA cropping paddocks... P. thornei occurs rarely; P. neglectus is the most frequent RLN identified in WA, occurring in at least 40% of paddocks; P. teres is found in 10% of paddocks... It is imperative that the species of RLN is correctly identified to enable growers to deploy appropriate crop varieties and species to minimise current and future losses...
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Catalogue: Ground Cover
Time-controlled grazing of pastures consisting of perennials and annuals, including balansa clover, is helping David Giddings achieve high stocking rates and growth rates of his prime lambs... Overall, perennials are providing more feed and extend the period of useable green feed by about a month.".. David decided to move to a 50:50 wheat/canola rotation to reduce grass herbicide use to 50 per_cent of the rotation...
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Catalogue: Ground Cover
The bleached lesions in scald are bound by distinctive dark-brown margins... Scald can cause losses as high as 50 per cent, with symptoms first appearing as blue, water-soaked lesions that turn to a grey-green colour before developing into elongated bleached blotches with dark-brown 'scalded' edges... "If resistant varieties are not an option, there are several chemical options available to control barley scald, including seed, fertiliser and foliar options," Dr McLean says...
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Catalogue: GRDC Updates
White grain At harvest in 2010 a number of growers in the north eastern Eyre Peninsula and Far North regions had deliveries of wheat rejected due to white grain... The fungus is likely to remain a concern for the future although severe problems are only likely to occur where wet springs promote infection late in the season... Growers are encouraged to maintain this level of resistance and avoid adopting varieties more susceptible than GladiusA and YitpiA. Yellow leaf spot The wet spring of 2010 will have increased the levels of the yellow leaf spot fungus (Pyrenophora tritici-repentis) in cereal stubbles...
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Catalogue: GRDC Updates
Introduction Within south-eastern Australia, rusts are the most widespread and potentially damaging diseases of cereal crops... For example, leaf rust of wheat does not attack barley... A good example is WyalkatchemA. Growers using such cultivars must plan to protect their crops from stripe rust before the onset of effective APR to minimise rust build up...
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