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Development of Meloidogyne hapla in Peanut. M. B. Castillo, Department of Botany and Plant Pathology, Oklahoma State University, Stillwater 74074, Present address of senior author: Department of Plant Pathology, University of the Philippines College, Laguna, Philippines; C. C. Russell(2), and L. S. Morrison(3). (2)(3)Department of Botany and Plant Pathology, Oklahoma State University, Stillwater 74074. Phytopathology 63:583-585. Accepted for publication 15 November 1972. DOI: 10.1094/Phyto-63-583.

The development of Meloidogyne hapla in Arachis hypogaea ‘Spantex’ was studied in a controlled environment chamber on a 16-hr day, 28-20 C regime. Larvae remained vermiform up to 5 days after inoculation. Enlargement began on the sixth day and on the eighth day a hemispherical posterior end, terminated by a spike had developed. The second (first parasitic) and third molts of the earliest-developed larvae were observed on the 11th and 12th day after inoculation, respectively. On the 13th day a few nematodes had already completed the fourth molt and had shed the molted cuticles. Oviposition occurred in 23 days, and infection by second generation larvae was observed after 39 days.

Additional keywords: root-knot, Arachis spp., nematode development.