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How to diagnose Root Lesion Nematode
Understanding Understanding how to gather information in a paddock is essential to diagnosing problems as Sarah CollinsResearch Officer Nematologist with theDepartment of Agriculture Food WA explains. Well here we are looking at rootlesion nematode and its really common in Western Australia and they are in about 60 per cent.
Of paddocks in WA and it is causing cropdamage of paddocks in WA and it is causing cropdamage yield losses in about 40 per cent ofpaddocks in WA. So it's a really significant issue. Because nematodes are pests of the roots and they actually prune and eat the root system away it meansthat the plant has much less root system to deal with the stresses. So it's less ableto take up water and nutrients. So that's why often nematodes systems on top of the plant look a lot like nutrient, well they are nutrient deficiencies because the plant isn't getting what it requires from soil.
Nematodes often look like as this paddock doesin a lot of places a general Nematodes often look like as this paddock doesin a lot of places a general patchiness. Nematode patches aren't verywelldefined it can just look like a waviness in thecrop or when it's at a much higher level it can look like a distinct area of bad growth or patches like we have in thispaddock. It's really not enough to walk through a paddock and just have a look around what you can see. Because we'retalking about a root.
Disease issue, you really need to dig upthe roots, disease issue, you really need to dig upthe roots, have a look at some healthy roots, have alook at some bad root systems and get an idea of what might be goingon below the ground. Collins says given the impactnematodes can have on a crop identifying and managing this damagingroot disease is important for growers to maximize yield potential. Nematodes actually feed on the roots,this particular nematode will actually either feed from the outside the root or they will actually travel.
Inside the root and eat on the inside the root and eat on the inside of the root system. So whatyou often find is a lack of lateral roots like this one here, and you'll find root pruning which is which is that lack of lateralroots. Sometimes you get some regrowth as we have here where the conditions and gottenbetter and the plants tried to grow back away from the issue. Often rhizoctonia and nematode are found in the same areas.
So but their symptoms quite similar So but their symptoms quite similar there are some differences. With rhizoctonia you will often get spear tipping which is browning andtipping of the ends of the roots whereas nematodes you get that general thickening and thinning of the roots andthat lack of lateral roots and really a complete lack of rootsystem. Often farmers don't get a professional diagnosis done andthat means that they might say or decide that they have rhizoctonia or they may think they've.
Got root lesion nematode got root lesion nematode but they don't know specifically what theydealing with. They need to know specifically what nematode they are dealing with if they have nematodes and distinguish if they have to dealwith rhizoctonia and nematodes or just one or the other.