Journal of Research in Environmental Science and Toxicology

Journal of Research in Environmental Science and Toxicology  Vol. 1(9), pp. 243-250, October 2012         
Copyright © 2012 International Research Journals

Full Length Research Paper

Influence of cultural practices on the development of gray leaf spot (GLS) on maize at Bako, Western Ethiopia

Aschalew Sisay1, Fekede Abebe1 and Kedir Wako2

1Bako Agricultural Research Center, P.O.Box 03, Bako, Ethiopia

2Mechara Agricultural Research Center, Mechara, Ethiopia

*Corresponding   Author   E-mail:

Received 25 September, 2012; Accepted 10 October, 2012 


The experiment was conducted at Bako Agricultural Research Center from 2008 to 2009 cropping seasons to evaluate the effect of sowing date and ploughing frequency on the development of Grey Leaf Spot (GLS). The susceptible variety Phb 3253, with three sowing dates (early, optimum and late at 10 days interval) and three ploughing treatments: Minimum tillage (once), farmer’s practice (three times ploughing) and four times ploughing was used. All plots were uniformly treated with GLS infected crop residue before first ploughing. The trial was laid out in factorial arrangement in Randomized Complete Block Design in three replications. Among the planting dates, the highest disease severity of 7.60, 7.44  and 7.00, (1-9 scale) and AUDPC (Area under disease progress curve) 305.83, 280.1 and 280.33 were recorded in early sown minimum (conservation) tillage practices, while the lowest was with AUDPC 161.50, 196.50 and 222.67 in four times ploughed plots in 2007, 2008 and 2009 years respectively. The highest thousand seed weight and grain yield was observed in four times ploughed and in early sown plots, while the lowest thousand seed weights and grain yield were recorded in the conservation tillage practice. The four times ploughed and early sown fields had a mean yield advantage of 474.73kg (6.66%) and a total yield advantage 2020.77kg (36.23.6%) over three times ploughed and minimum tillage practices for the three seasons (2008-2009). In general higher disease severity, low thousand seed weight and grain yield were recorded for the conservation tillage compared to other practices. The over all result showed that four times ploughing result in superior maize grain yield performance compared to others as it has resulted in reduced disease development.

Keywords: Grey Leaf Spot (GLS), ploughing frequency, maize residue, sowing date, cultural or farmers practice.

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