Peanut scab (Sphaceloma arachidis Bit. & Jenk.) has become epidemic in the southern peanut region of Argentina during the 1997/98 and 1999/00 growing seasons. To determine the potential for transmission of S. arachidis by crop debris and seeds and to describe the spread of scab from infected debris, experiments were conducted during two growing seasons. Scab was not observed in field or greenhouse tests planted with seed of cv. Florman obtained from diseased peanut plants. The severity of disease was significantly greater (P ≥ 0.05) when the debris from diseased peanut plants was applied over the seed rows after planting. Furthermore, disease spread from an inoculum source (debris from infected plants) was generally followed the Río Cuarto's prevailing northeasterly wind, and the fourth-order equation provided good fit to this disease gradient. Results combined over the greenhouse and field experiments indicated that infected residues from the previous peanut crop are a source of inoculum for onset and development scab epidemics in the field.
Available as PDF only - Use Download Feature
Keywords: disease, epidemiology, peanut scab
How to Cite:
Kearney, M. & Marinelli, A. & Oddino, C. & March, G., (2002) “Transmission and Dispersal of Sphaceloma arachidis by Crop Debris and Seed from Infected Peanut”, Peanut Science 29(1), p.13-17. doi: https://doi.org/10.3146/pnut.29.1.0003