First report of Alternaria infectoria on amaranth (Amaranthus caudatus ssp. mantegazzianus) in Argentina.
Noelting, M. C.; Molina, M. C.; Mónaco, C. I.; Sandoval, M. C.; Perelló, A.
Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, calle 60 y 119, C.P. 1900, La Plata, Argentina.
New Disease Reports 2012 Vol. 25 pp. 11
British Society for Plant Pathology, Reading, UK
Language of Text
At the end of December 2009, the presence of discoloured panicles and seeds of amaranth (Amaranthus caudatus subsp. mantegazzianus) was recorded in Llavallol, Buenos Aires, Argentina. Up to 100% of the surface area of seeds was affected by the disease. Fungal isolates with morphological characteristics similar to those of Alternaria infectoria [Lewia infectoria] were collected from diseased grains. The average conidial size on potato carrot agar was 32-40 × 9.6 µm, with a conidial beak length of 16-48 µm and four transverse septa. The presence of a longitudinal septum was recorded in 18% of the conidia, with 2% having two partitions. In general, these measurements are within the size range determined for Alternaria infectoria. This is thought to be the first report of Alternaria infectoria affecting panicles and seeds of amaranth in Argentina.