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Effect of peanut mottle virus on reaction of peanut arachis hypogaea cultivar tamnut 74 to cercospora arachidicola



Effect of peanut mottle virus on reaction of peanut arachis hypogaea cultivar tamnut 74 to cercospora arachidicola



Peanut Science 13(1): 31-33



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 .times. 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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