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Influence of pH on hatching and larval emergence of root-knot nematode, Meloidogyne javanica

Elgindi, D.M.

Bulletin of the Faculty of Agriculture, Cairo University 18(2): 137-142

1967


ISSN/ISBN: 0526-8613
Accession: 014523349

Meloidogyne javanica causes widespread damage to crops in the alkaline soil of Egypt. A study was made to determine the effects of pH value on hatching of M. javanica larvae. Egg masses of approximately the same age were taken from tomato plants and placed in test solutions of tap water (p H 7.0), soil extract (pH 8.8) and Hoagland nutrient solution adjusted to pH values of 2, 4, 6, 8. Larvae were counted and fresh solution added every 3 days for 24 days. In Hoagland solution at p H values of 2, 4 and 6, hatching was completely inhibited for 8, 7 and 4 days respectively and then occurred for only a few days. At pH 2.0 in Hoagland solution, only 73% of larvae hatched compared with 89.5% at pH 8 and 97.0% in soil extract. It is concluded that neutral and alkaline pH. values favour the emergence of M. javanica larvae.

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