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pt tolerance

Catalogue: GRDC Updates
NGA have been involved in 22 field trials since 2007, in collaboration with Steven Simpfendorfer I&I NSW, evaluating the impact of crown rot (CR) on a range of winter cereal crop types and varieties... During 2007 & 2008 a common series of 5 bread wheat varieties, 4 barley varieties and 1 durum were evaluated in all 18 trials... 2. Less apparent range in variety Pt tolerance than seen for bread wheat Figure 5 shows the variety yield performance compared to EGA Wylie for all varieties evaluated in both 2008 and 2009...
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Catalogue: GRDC Updates
Although the trials were not designed to focus on nematodes, a convincing trend was apparent after 2008 that indicated the root lesion nematode Pratylenchus thornei (Pt) was having a frequent and large impact on wheat variety yield... During 2007 & 2008 a common series of 5 bread wheat varieties, 4 barley varieties and 1 durum were evaluated in all 18 trials (NB only 17 yield results are presented as barley varieties were heavily damaged by emus at 1 site in 2008)... 2. Less apparent range in variety Pt tolerance than seen for bread wheat Figure 5 shows the variety yield performance compared to EGA Wylie for all wheat varieties evaluated in both 2008 and 2009...
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Catalogue: GRDC Updates
During 2007 & 2008 a common series of 5 bread wheat varieties, 4 barley varieties and 1 durum were evaluated in all 18 trials (NB only 17 yield results are presented as barley varieties were heavily damaged by emus at 1 site in 2008)... Ten trials had no Pt detected with 7 sites having Pt present ( Pt were present at 5 of 10 sites in 2007 and 2 of 7 sites in 2008, PreDicta B Pt levels ranged from 1000-7000/kg soil in 2007 and 4000-5000/kg soil in 2008)... 2. Less apparent range in variety Pt tolerance than seen for bread wheat Figure 5 shows the variety yield performance compared to EGA Wylie for all wheat varieties evaluated in both 2008 and 2009...
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Catalogue: GRDC Updates
NGA have been involved in 22 field trials since 2007, in collaboration with Steven Simpfendorfer I&I NSW, evaluating the impact of crown rot (CR) on a range of winter cereal crop types and varieties... Although the trials were not designed to focus on nematodes, a convincing trend was apparent after 2008 that indicated the root lesion nematode Pratylenchus thornei (Pt) may be having a wider and larger impact on actual yield than previously expected... Figure 5 shows the variety yield performance compared to EGA Wylie for all varieties evaluated in both 2008 and 2009...
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Catalogue: GRDC Updates
The levels present a high risk of yield loss in intolerant varieties... Tolerance is the ability of a variety to maintain yield in the presence of a pathogen e.g. Pt or the crown rot fungus... Previous research conducted by NSWDPI and NGA across 11 sites in northern NSW in 2007, has demonstrated that crown rot caused average yield losses of 20% in barley (up to 69% under drier conditions and hotter temperatures during grain-fill), 25% in bread wheat (up to 65%) and 58% in durum (up to 90%)...
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