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Catalogue: GRDC Updates
Crop rotations must be selected according to the species of root-lesion nematode present on your farm... Summer crops offer a means of reducing the populations of root-lesion nematodes but only when you know which species of root-lesion nematode is present... Results from a field experiment show that populations at 0-15 cm increased after harvest compared to the populations at planting (striped bar)...
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Catalogue: GRDC Updates
3. Choose tolerant wheat varieties to maximise yields (go to nvtonline.com.au).. From our research, the optimal temperature for reproduction of Pratylenchus thornei is 22C; populations increased, although at slower rates, from 17 to 28C... We have also found reduced growth and yield of wheat and chickpea following canola in a low phosphorus soil (7 mg/kg Colwell P) in two separate 2-year winter crop rotation experiments...
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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
The results send a clear signal to growers that baseline measurement and management of RLN populations through soil testing, varietal selection and crop rotation is imperative if yield losses are to be avoided... "If RLN are not detected, protect those paddocks from contamination by controlling movement of soil and water on the farm," she said... In paddocks where RLN populations are detected, Dr Owen said rotation and variety selection were the primary management options and that growers should aim to reduce populations to less than 2 nematodes/g soil (2000/kg soil)...
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Catalogue: GRDC Media
The results send a clear signal to growers that baseline measurement and management of RLN populations through soil testing, varietal selection and crop rotation is imperative if yield losses are to be avoided... "If RLN are not detected, protect those paddocks from contamination by controlling movement of soil and water on the farm," she said... In paddocks where RLN populations are detected, Dr Owen said rotation and variety selection were the primary management options and that growers should aim to reduce populations to less than 2 nematodes/g soil (2000/kg soil)...
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Catalogue: GRDC Updates
On-going vigilance by testing soil for nematodes is essential when susceptible crops are planted... Populations of P. thornei increased after growing mungbean or soybean compared to sunflower, sorghum, maize or clean fallow (Figure 2)... Overall, populations increased five times compared to before planting the summer crops, but remained below 250/kg soil (Figure 4)...
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Catalogue: GRDC Final Reports
Root-lesion nematodes ( Pratylenchus thornei and Pratylenchus neglectus ) are persistent, destructive pests that invade and damage the roots of susceptible crops causing yield losses... A four-year crop rotation experiment on a P. thornei infested site showed that the yields of a susceptible wheat variety are affected by crops grown three years previously... Glasshouse experiments in the previous Cropping Options project showed that for wheat, resistance and tolerance to P. thornei is not necessarily indicative of resistance or tolerance to P. neglectus , and that some grain sorghum varieties also appeared susceptible to P. neglectus ...
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