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nematode population

Catalogue: GRDC Final Reports
RLN cause substantial yield losses, particularly in wheat, but they reproduce on numerous summer and winter crops... The resistance experiments also demonstrated the large range of susceptibility within crops, even for barley, providing an additional benefit from this work... We conducted a targeted survey of nine farms in the northern grain region to gain knowledge about the presence of the stunt nematode and zoosporic fungi such as Olpidium (zoosporic fungi are characterised by the production of spores called zoospores which have flagella and are motile in water)...
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Catalogue: GRDC Media
"I had always assumed, as had many other researchers, that nematodes ate into the roots, stunting their growth so that the plants could not reach water in the deeper soil," Dr Whish said... His research is finding that the root systems have developed almost normally and Dr Whish instead suspects the nematodes inflict their damage by penetrating the roots' outer layer and restricting their ability to transport water... "The nematodes penetrate the root, lay eggs inside the cortex of the roots and eventually the outer wall of root collapses causing the lesion and we believe this breaks the pipe that transports water to the plant," Dr Whish said...
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Catalogue: GRDC Media
"I had always assumed, as had many other researchers, that nematodes ate into the roots, stunting their growth so that the plants could not reach water in the deeper soil," Dr Whish said... His research is finding that the root systems have developed almost normally and Dr Whish instead suspects the nematodes inflict their damage by penetrating the roots' outer layer and restricting their ability to transport water... "The nematodes penetrate the root, lay eggs inside the cortex of the roots and eventually the outer wall of root collapses causing the lesion and we believe this breaks the pipe that transports water to the plant," Dr Whish said...
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Catalogue: GRDC Updates
The key to management of root lesion nematodes relies on three important points: 1... Growing tolerant and resistant crops to keep root lesion nematode populations at low, manageable levels... Figure 2: We followed populations of P. thornei in the soil profile during a 4 year crop rotation trial at Formartin (70km W of Toowoomba)...
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Catalogue: GRDC Updates
Summary Root-lesion nematodes are found throughout the northern grain region and have the potential to reduce wheat yields by up to 50% and chickpea yields by 30%... Best management practices rely on choosing tolerant varieties (that will yield well when nematodes are present) and growing resistant crops (to keep nematode populations low)... The most reliable way to tell if nematodes are present on farms is to have soil tested in a laboratory because symptoms of nematode damage can be difficult to distinguish - often attributed to "a dry finish", "a poor season" or "nutrient deficiencies"...
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Catalogue: GRDC Updates
For Pratylenchus thornei , a moderately tolerant wheat variety (such as EGA Gregory) could return another 1.9t/ha compared to an intolerant wheat variety such as Petrie (or extra $450/ha with wheat valued at $239/t)... This year we'll present new information on the role of winter crops grown in rotation with wheat and details about the potential role of more resistant wheat in management of root-lesion nematodes... Our research has shown that nematicides will only reduce populations in the top soil layers...
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Catalogue: GRDC Media
Root-lesion nematodes are present in approximately 70% of fields in the northern grain belt and can slash yields by up to 50% in wheat and 20% in chickpeas... All major winter crops, wheat, barley and chickpeas, are susceptible to the root-lesion nematode species P. thornei and encourage the proliferation of nematode populations... Region North, South, West < Keep browsing 0 Responses to Nematode resistance ratings updated for wheat..
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Catalogue: GRDC YouTube channel
" GRDC Grains Research Updates Updates March 2-3, 2011, Northern Region, Goondiwindi QLD, Kirsty Owen 16 September 2013 Kirsty Owen, DEEDI, talks about root-lesion nematodes and the impacts of crop rotations and varietal selection on nematode populations... Three out of four paddocks tested in the northern grain region have root-lesion nematodes... Technology to reduce spray drift GCTV: Drift Reducing Technology..
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Catalogue: GRDC Media
Department of Agriculture, Fisheries and Forestry (DAFF) soil microbiologist Dr Kirsty Owen told growers and advisors at the recent Grains Research and Development Corporation (GRDC) Grains Research Update at Goondiwindi that a pre-sowing assessment of soil nematode populations was critical to minimise the risk of yield loss through crop and variety selection... " the growers looking to plant wheat then need to consult the 2014 Wheat Variety Guide, look at the tolerance data and select the most tolerant variety for the particular nematodes present in the soil... Growers urged to soil to winter plant Kirsty Owen < Keep browsing 0 Responses to Growers urged to soil test for nematodes prior to winter plant..
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Catalogue: GRDC Media
Growers urged to soil test for nematodes prior to winter plant.. All major winter crops, wheat, barley and chickpeas, are susceptible to the root-lesion nematode species P. thornei and encourage the proliferation of nematode populations... Department of Agriculture, Fisheries and Forestry (DAFF) soil microbiologist Dr Kirsty Owen told growers and advisors at the recent Grains Research and Development Corporation (GRDC) Grains Research Update at Goondiwindi that a pre-sowing assessment of soil nematode populations was critical to minimise the risk of yield loss through crop and variety selection...
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