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Cause: Meloidogyne hapla, a nematode that also attacks other vege-table crops. The Columbia root-knot nematode, M. chitwoodi, is not an economic problem on carrots.
The investigation was directed to study the state of mycorrhization, its pattern and variation, if any and, the differences in nutritional uptake of each AM-host symbiosis. The findings suggest the role of host on the differential expression of G.
Drought conditions affect an estimated 25% of crops with a corresponding decrease in productivity estimated worldwide to be worth US$10 billion/yr. Reclamation of arable land of marginal quality will result in crops that increasingly experience salt stress.