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spot type net blotch

Catalogue: GRDC Media
Net blotch is expected to be at damaging levels in Western Australian barley crops this year, particularly in high rainfall areas, but growers can reduce the risks by adopting an integrated disease management approach... "There is a high risk of damage to 2014 barley crops due to carry-over of the disease from last year, heavy stubble loads and warm conditions forecast for coming months," he said... "Both forms of net blotch have become more prevalent in WA in recent years and were damaging last season, particularly in south coastal regions."..
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Catalogue: GRDC Media
Net blotch is expected to be at damaging levels in Western Australian barley crops this year, particularly in high rainfall areas, but growers can reduce the risks by adopting an integrated disease management approach... "There is a high risk of damage to 2014 barley crops due to carry-over of the disease from last year, heavy stubble loads and warm conditions forecast for coming months," he said... "Both forms of net blotch have become more prevalent in WA in recent years and were damaging last season, particularly in south coastal regions."..
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Catalogue: GRDC Media
Applying potassium (K) to barley crops that are deficient in this nutrient can boost grain yields and reduce the impact of some foliar leaf diseases, such as powdery mildew and spot type net blotch... The grain yields (kg/ha) response of barley to application of K fertiliser (kg K/ha) as sulphate or chloride with and without the application of fungicides to control powdery mildew... In some of the K trials, double the amount of sulphate K - compared to chloride K - was needed to reach 90 per cent of maximum barley grain yield where crops were infected by powdery mildew...
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Catalogue: GRDC Media
Applying potassium (K) to barley crops that are deficient in this nutrient can boost grain yields and reduce the impact of some foliar leaf diseases, such as powdery mildew and spot type net blotch... The grain yields (kg/ha) response of barley to application of K fertiliser (kg K/ha) as sulphate or chloride with and without the application of fungicides to control powdery mildew... In some of the K trials, double the amount of sulphate K - compared to chloride K - was needed to reach 90 per cent of maximum barley grain yield where crops were infected by powdery mildew...
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Catalogue: GRDC Final Reports
The application of potassium (K) fertiliser at rates up to 40 kg/ha of K significantly decreased the percentage of leaf area diseased for spot-type net blotch and powdery mildew of barley... The chloride source significantly reduced the percentage of leaf area diseased at rates of 10 and 20 kg/ha of applied K. The two sources of K (KCl, or K 2SO 4) gave significantly different yield response curves where powdery mildew was present... In regions prone to leaf disease we suggest farmers take soil samples before seeding to determine soil K levels...
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Catalogue: GRDC Final Reports
Twenty one field experiments were carried out on potassium (K) deficient sandy soils to assess the effect of fertiliser K, as either potassium chloride (KCl - 50% K) or potassium sulphate (K 2 SO 4 - 41% K), on the leaf diseases and grain production of barley crops... In regions prone to leaf diseases, we suggest farmers take soil samples before seeding to determine soil potassium (K) levels... Application of different rates of fertiliser N may change yield responses of barley and responses to applications of fertiliser K and this effect may have influenced leaf disease severity levels reported in this project...
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Catalogue: GRDC Final Reports
The results of the survey indicate that spot-type net blotch occurs throughout barley growing areas of WA. Knowledge of genetic variation for virulence previously recorded for the pathogen has been significantly expanded, with a number of pathotypes not previously identified being now recognised... The work illustrates the existence of pathogenic variation for this disease in WA and has identified several new potential resistance donors... When the lines were evaluated at the Mt Ridley field trial, only a few lines (six - being Birka, Golf, Hannchen, Keel, TR251 and TR250) possessed adequate levels of resistance at the adult plant stage...
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