Abstract
Under greenhouse conditions, a pot experiment was conducted to clarify the potential of using some legumes as intercropped plants for reducing the root-knot nematode Meloidogyne incognita infecting sugar beet (Beta vulgaris L.) cv. DS-9004 compared to non-legume plant, garlic and non-intercropped plants. The obtained results revealed that all legumes including chickpea, Egyptian clover, faba bean, fenugreek, lentil and lupin significantly (p ≤ 0.05) reduced nematode criteria on the roots of sugar beet at different degrees. Chickpea and Egyptian clover reduced the number of galls on the roots of sugar beet as the percentage of reductions were 54 and 50%, respectively, followed by lupin and fenugreek, while garlic achieved 72% reduction compared to non-intercropped plants. Lupin reduced the number of egg masses by 59% followed by Egyptian clover and fenugreek (32%), three months after the treatment. On the other hand, six months after the treatment, chickpea reduced the number of galls by 55.7% followed by lupin (53.4%) and Egyptian clover (52.3%) and the percentage of reduction of egg masses behaved the same trend. Also, the treatments improved plant growth criteria of sugar beet, weight of roots (tubers) and the percentage of total soluble solids (TSS).
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