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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.