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Effect of of 5-aminolevulinic acid (ALA) on hatching rates (A and C) and inhibition rates (B and D) of Meloidogyne incognita and Heterodera glycine when their eggs were in free eggs form (A and B) or egg masses of M. incognita and cysts of H. glycine (C and D), as compared to that incubated in the water control. Mean for each column is an average of 12 replications. Error bars indicate standard error.
