The Response of Single Crosses to Inoculation with Maize Lethal Necrosis

  • Susan Cheruiyot University of Eldoret, P.O Box 2666-30200 Kitale
  • Oliver Kiplagat University of Eldoret, P.O Box 2666-30200 Kitale
  • Philip Leley Kenya Agricultural and Livestock Research Organization, P.O BOX 340-90100 Machakos, Kenya
Keywords: Maize Lethal Necrosis, susceptible, resistant, varieties.


Maize is by far the most important staple food commodity in many households in Kenya. Maize lethal Necrosis disease has in the recent past become a menace in hindering maize production in many regions of Kenya. A survey was carried out in Naivasha and Bomet to identify MLN resistant single cross genotypes growing under high disease pressure. MLN disease severity and MLN disease incidence was based on symptoms on the plant on a three weeks interval after planting until grain filling stage, plant stand count and yield. The causal pathogen was confirmed by diagnostic tests. There was a significant difference in resistance levels at p≤0.05 among the single cross varieties with respect to MLND. The scores ranged from 2.8- 3.9 in the two locations. Naivasha had higher disease scores with most severe symptoms in line SC-MLN-15-1 with a score of 4.0. Lines SC-MLN-15-6, SC-MLN-15-6, SC-MLN-15-7, SC-MLN-15-8, SC-MLN-15-15 and SC-MLN-15-37 showed moderate resistance. Lines SC-MLN-15-3 and SC-MLN-15-56 exhibited moderate resistance. High variability of MLN response was observed among the 120 maize genotypes indicating the exisistence of potential useful germplasm for improving MLN resistance for breeding programmes. It is concluded that MLN is still a persistent problem with high incidence associated with growing susceptible varieties, recycling hybrid seed and presence of alternative hosts for insect vectors; however resistant genes could be obtained from maize genotypes showing lower disease severity in these regions which have a high disease pressure which is a crucial strategy to ensure safe production of maize in the region


Jaetzold, R., H. Schmidt, B. Hornetz and C. Shisanya. 2006. Farm management handbook of Kenya. 2nd edition. Vol II. Part B. Central Kenya. Central Province. Ministry of Agriculture. Nairobi. Kenya.

Magenya, O.E.V., J. Mueke and C. Omwega. 2008. Significance and transmission of maize streak virus disease in Africa and options for management: A review. African Journal of Biotechnology 71: 4897-4910.

MoA. 2013. Food security assessment report. March 2013. Department of Crops Management. Ministry of Agriculture. Republic of Kenya.

Murdoch, A.J., J.M. Njuguna, B. Lukuyu, F. Musembi, D.M. Mwangi, J.M. Maina . 2003. Integrated pest management options to improve maize forage yield and quality for small-scale dairy farmers in central Kenya. Aspects of Applied Biology 70: 1-7.

Olwade, J. and M. Smale. 2012. Is older better? Maize hybrid change on household farms in Kenya. Selected paper prepared for presentation at the International Association of Agricultural Economists (IAAE). Triennial Conference, Foz do Iguacu, Brazil, 18-24 August, 2012.

Wangai, A.W., Redinbaugh, M.G., Kinyua, Z.M., Mahuku, G., Sheets, K., and Jeffers, D. 2012.First report of Maize chlorotic mottle virus and maize lethal necrosis in Kenya. Plant Dis.96: 1582.
How to Cite
Cheruiyot, S., Kiplagat, O., & Leley, P. (2018, December 31). The Response of Single Crosses to Inoculation with Maize Lethal Necrosis. African Journal of Education,Science and Technology, 4(4), pp 135-143. Retrieved from