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Effect of peanut mottle virus on reaction of peanut cv. Tamnut 74 to Cercospora arachidicola

Authors: H. A. Melouk , J. L. Sherwood

Abstract

Two-week old seedlings of Tamnut 74 peanut were inoculated with peanut mottle virus (PMV) or left nontreated, and four weeks later were sprayed with a conidial suspension of Cercospora arachidicola (2 × 10⁴ conidia/mL) prior to placement in a polyethylene enclosure in a growth chamber (22-30 C, 100% RH). After three weeks, number of lesions/leaflet, leaflet area (mm²), necrotic area (mm²)/leaflet, percent necrotic area, conidial density (conidia/mm²) of necrotic area), and conidia/leaflet, was determined on four leaflets for each of 12 PMV-infected and 12 virus-free plants. Conidia/leaflet (one important parameter in evaluating reaction of peanut genotypes to C. arachidicola), lesions/leaflet, area of lesion, and leaflet area was reduced on PMV-infected plants compared to virus-free plants in each of 4 experiments. Similarly, necrotic area/leaflet were reduced in 3 of 4 experiments. Conidia/mm² of necrotic area was reduced in 2 of 4 experiments. PMV was not detected in conidia of C. arachidicola from PMV infected plants by inoculation to a PMV indicator host, serology, electron microscopy or electrophoresis.

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Keywords: Peanut mottle virus interaction, Arachis hypogaea, reaction evaluations

How to Cite: Melouk, H. & Sherwood, J. (1986) “Effect of peanut mottle virus on reaction of peanut cv. Tamnut 74 to Cercospora arachidicola”, Peanut Science. 13(1). doi: https://doi.org/10.3146/i0095-3679-13-1-9