Host status of some imported sugar beet varieties to Meloidogyne incognita in Egypt
Host status of some imported sugar beet varieties to Meloidogyne incognita in Egypt
M.M.A. Youssef† and W.M.A. El-Nagdi
ABSTRACT
Ten sugar beet Beta vulgaris L., varieties were tested for their susceptibility/resistance against root-knot nematode
Meloidogyne incognita under screen house conditions. All the tested varieties varied in their degree of
susceptibility/resistance according to nematode damage index. Host vigor calculated as an average of percentages
root weight potential and the tested technological characteristics (total soluble solids %) were used as a new scale to
assess host reaction. The combination between the degree of susceptibility/resistance and host vigor of each variety
gave a better evaluation and clear relationship between nematode infection and sugar beet variety yield quality and
quantity. On this basis, sugar beet varieties were categorized into one variety as highly susceptible (BTS303), four
varieties as susceptible (BTS 237, Gazelle, Meridi and SN627), one variety as highly resistant (Panther), three
varieties as resistant (BTS301, BTS302 and SN626) and one variety as tolerant (Tenor). It is concluded that the
tested sugar beet varieties differed in their susceptibility/resistance to root-knot nematode M. incognita depending on
their damage index in combination with their plant vigor. The highly resistant or resistant sugar beet varieties
determined in this study could be recommended for breeding programme and could be introduced in integrated pest
management program of root-knot nematode.
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December 2015
Pakistan Journal of Nematology, Vol. 33, Iss. 2, Pages 115-228
