Response of maize hybrids to corn stuntdisease caused by Spiroplasma kunkelii in the Argentine Northwest (NOA) – 2023-2024 growing season

Abstract

Corn stunt disease (CS) is caused by Spiroplasma kunkelii, Maize rayado fino virus (MRFV), Maize bushy stunt phytoplasma (MBSP) and Maize striate mosaic virus (MSMV) and transmitted by Dalbulus maidis. During 2023–2024, it severely affected corn production in Argentina, with losses of 20 %. Fourteen commercial maize hybrids were evaluated in locations across the Argentine Northwest (NOA) to determine their performance, incidence and severity in response to the disease. The results showed incidence values ranging from 8 % to 100 %, with severity varying among the hybrids. The performance was above average in SYN505VIP3, DK7210PRO4, DK7220PRO4, P2297PWUE, and PAN5175PWU. SYN505VIP3 showed mild symptoms and low severity. Although DK7210PRO4, DK7220PRO4, P2297PWUE, and PAN5175PWU had more severe symptoms, their performance was not significantly impacted, though there was some variability in P2297PWUE and PAN5175PWU. In contrast, BRV8380PWE, DK7272VT3P, BRV8421PWUE, ZEFIRPWU, and NEXT22.6PWUE, with similar severity, had below-average performance, with particularly high severity in NEXT22.6PWUE and ZEFIRPWU. Regression analysis revealed that the severity index explains 72 % of the variability in performance, with each additional unit of severity associated with an average reduction of 15.96 kg/ha in yield. This underscores the importance of selecting suitable hybrids to mitigate the impact of CS.

El achaparramiento del maíz es causado por Spiroplasma kunkelii, el virus del rayado fino (MRFV), el fitoplasma del maíz (MBSP) y el virus del mosaico estriado (MSMV) y transmitido por Dalbulus maidis. Durante 2023–2024, afectó gravemente la producción maicera de Argentina, con pérdidas del 20 %. Se evaluaron catorce híbridos comerciales en el noroeste argentino y se determinó rendimiento, incidencia y severidad frente a la enfermedad. Se encontraron valores de incidencia entre el 8 % y el 100 %, con severidad variable entre híbridos. SYN505VIP3, DK7210PRO4, DK7220PRO4, P2297PWUE y PAN5175PWU tuvieron un rendimiento superior al promedio. SYN505VIP3 mostró síntomas leves y baja severidad. Aunque DK7210PRO4, DK7220PRO4, P2297PWUE y PAN5175PWU tuvieron síntomas más severos, su rendimiento no se vio muy afectado, si bien P2297PWUE y PAN5175PWU mostraron variabilidad. En contraste, BRV8380PWE, DK7272VT3P, BRV8421PWUE, ZEFIRPWU y NEXT22.6PWUE, con severidad similar, tuvieron rendimiento inferior al promedio, especialmente NEXT22.6PWUE y ZEFIRPWU, con mayor severidad. El análisis de regresión reveló que el índice de severidad explica el 72 % de la variabilidad en el rendimiento, con cada unidad adicional de severidad asociada a una reducción promedio de 15,96 kg/ha. Esto subraya la importancia de seleccionar híbridos adecuados para mitigar el impacto del achaparramiento.