Screening the Resistance Reaction of Normal Maize Inbred Lines to Turciccum Leaf Blight and Grey Leaf Spot Diseases Resistance at Bako, Western Oromia

Authors

  • Debela Diro Ethiopian Institute of Agricultural Research, Bako Agricultural Research Centre, P.O. Box 3, Bako, Ethiopia.
  • Midekssa Dida Ethiopian Institute of Agricultural Research, Ambo Agricultural Research Centre, P.O. Box 37, Ambo, Ethiopia.
  • Temesgen Deressa Ethiopian Institute of Agricultural Research, Bako Agricultural Research Centre, P.O. Box 3, Bako, Ethiopia.

Keywords:

Diseases, Genotypes, Grey leaf spot, Inbred lines, Resistant, Turciccum leaf blight

Abstract

The most destructive foliar diseases that affect maize in the western region of Ethiopia are turcicum leaf blight and grey leaf spot. Bako National Maize Research Center conducted a study during the 2018/19 main cropping season with the objective of screening normal maize genotypes against turcicum leaf blight and grey leaf spot, which are caused by Exserohilum turcicum (Pass.) Leonard and Suggs
and Cercospora zeae maydis, respetively. Two replications of the field experiment were set up in an alpha lattice design. Artificial inoculations of turcicum leaf blight and grey leaf spot were made twice at four to six leaf stages of genotypes by putting dry, ground-infected maize leaves into the whorls of younger maize plants in order to ensure the development of infection. At intervals of seven days from the time the disease first appeared until the maize reached physiological maturity, the disease severity (1–5) on 66 test entries was evaluated. During the season, all of the inbred lines exhibited symptoms of their respective diseases; nevertheless, there was a significant difference (P<0.05) in the intensity of the diseases among the lines. This study revealed that 20, 15, 20 and 11 inbred lines, were found resistant, moderately resistant, susceptible and highly susceptible, respectively to TLB disease. Likewise, 22, 10,
11 and 23 inbred lines, were found resistant, moderately resistant, susceptible and highly susceptible, respectively to GLS disease. The result implied that the genotypes identified to be resistant to GLS and TLB might be used in further breeding programs.

Published

25.01.2024