Pathology
M.exigua causes galls on the root system, which are visible with the naked eye. Although, M. coffeicola does not produce galls it causes peeling and cracking of roots instead. Reduction of root system is observed, mostly because nematodes feed closer to xylem and phloem, where water and nutrients are transported into the plant. This blockage reduces roots system development. Above ground symptoms include defoliation and leaf chlorosis leading to death of the plant.
Read more about this topic: Coffee Root-knot Nematode
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