Field Crop Disease Technical Paper

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Field Crop Disease Technical Paper By, Nic Petrykowski Disease discription: Rhizomania is a disease of sugar beets that has foliar and root symptoms. The most distinct foliar symptom is chlorotic patches in the field that can be observed from the ground. It is possible that plants may just wilt or become stunted without other obvious foliar symptoms. Upon closer inspection other symptoms can be noted. The foliage exhibits a lemon-yellow or lettuce-green tint. The veins on the midribs of leaves exhibit yellowing. The petioles of leafs appear elongated with narrow leaf laminae. The root symptoms, what the disease is named for, rhizomania translates to "root madness". The symptoms of this madness include a dark brown bearded appearance near the root tip, constriction of roots, pale yellow or dark brown discoloration of vascular tissue when cut in a transverse section, or nodules (tumors). It is rare for all root symptoms to appear on a single plant. Tolerant cultivars will exhibit less symptoms, unless disease pressure is extremely high (Beet necrotic yellow vein virus benyvirus). This disease is very destructive especially when plants are infected with the virus early on. It is common that more than half the yield is lost, losses of up to 80% are even possible. (Mcgrahn R.D.G., Grimmer M.K., Mutasa-Gottgens E.S., Stevens M., 2009) Pathogen: The virus responsible for rhizomania, beet necrotic yellow vein virus (BNYVV) is vectored by an
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