Occurrence and Distribution of Physiological Races of Exserohilum turcicum in Maize-Growing Regions of Mexico

• DOI: 10.1094/pdis-03-22-0626-re
• Publication Date: 2022-09-12T03:55:23Z
• Authors: Carlos Muñoz-Zavala; Alexander Loladze; Mateo Vargas-Hern...; Elizabeth García-...; Amos Emitati Alak...; Juan Manuel Tovar...; Paul H. Goodwin; Santos Gerardo Le...
• Keywords: Exserohilum

Turcicum leaf blight (TLB) is a common foliar disease of maize in Mexico that caused by the fungal pathogen Exserohilum turcicum. The most effective management strategy against TLB monogenic race-specific resistance. Among 140 E. turcicum isolates from symptomatic leaves collected fields Mexico, 100 were obtained tropical (Veracruz) and temperate areas (Estado de México) between 2010 2019, 40 (Sinaloa, Tamaulipas, Veracruz, Chiapas), subtropical (Nayarit, Jalisco, Guanajuato), Hidalgo, Puebla) 2019. All symptoms on positive control (ht4), showing they all pathogenic. Six physiological races (2, 3, 23, 3N, 23N, 123N) identified based resistant or susceptible responses displayed five differential genotypes (A619Ht1, A619Ht2, A619Ht3, B68HtN, A619ht4). was race accounting for 68% isolates, followed 123N, 2, 3N at 15, 8, 6, 1%, respectively. Race 123N able to infect greatest number used study. detected Sinaloa Estado México. 3 Nayarit Jalisco. 2 México, Tamaulipas. 23 equally dominant tropical, subtropical, regions, while more environment, 23N environments. There no evidence shifts