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The host suitability of the ten sugarbeet varieties of monogerm (i.e., Estaban, Francescan, Sander, Sible and Univers) and multigerm (i.e., Heba, Lilly, Mammut, Mirados and Oscarpoly) to M. incognita infection was conducted under greenhouses condition. Results revealed that all yield characters (root, top and sugar yields) and quality characters, (sucrose, total soluble solids and purity %) of such screened sugarbeet variety were obviously diminished by M. incognita infection to great extort. The degree of susceptibility/ resistance of these sugarbeet varieties evaluated according to modified host parasite index (MHPI) scale which was used as a new and suitable scale (special technique) to assess host (sugarbeet plant) reaction. The MHPI is calculated by dividing a gross average of reduction percentages in all yield and quality characters by the susceptibility rate. It could be ranked as standardization of host suitability technique and reporting of resistance of sugarbeet to rootknot nematodes. On this basis, the screened sugarbeet varieties are categorized into three groups, two varieties are as tolerant host (Heba and Sible), four as low susceptible (Estaban, Lilly, Mirador and Sandor) and four as moderately susceptible (Francescan, Mammut, Oscarpoly and Univers) against rootknot nematode, M. incognita. So, they could be Heba (as multigerm) and Sible (as monogerm) varieties recommended as excellent commercial varieties in Egypt, and could be introduced in integrated pest management (IPM) for controlling root-knot nematodes.

egyptian journal of agronematology

Evaluation of Some Sugarbeet Varieties for Their Susceptibility to Root- knot Nematode, Meloidogyne incognita, According to Modified Host Parasite Index (MHPI) Scale