Evaluation of certain sugarbeet varieties for their productivity and susceptibility to Meloidogyne javanica root-knot nematode [electronic resource].

Includes references.

Seventeen varieties of sugarbeet either as -monogerm or multigerm were screened for their productivity and susceptibility or reSistance against the infection by Me/oidogyne javanica. All the tested varieties varied in the degree of nematode development and reproduction. Statistical differencesjn sugarbeet varieties are found between infected and non infected plants in yields of "roots, leaves and sugar except, Barca, Pamela and Toro varieties which were not significantly damaged in all lhese parameters. All evaluated sugarbeet varieties were also significant decreased in percentages of sucrose, total soluble solids and purity except, Esperanza and Toro varieties which were not significanUy decreased in total soluble solids and pUrity percentages, respectively. Four host categories systems were suggested in this study. Root damage index is an average of gall index, gall size and gall area. The combination of the nematode reproduction and root damage index is termed as susceptibility rate. Host vigor percentage is an average of root yield potential and sucrose and total soluble solids percentages.

Summary in Arabic.

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