1. School of Plant Sciences, Haramaya University, Dire Dawa, Ethiopia;
2. Department of Zoology and Entomology, University of Fort Hare, Alice, South Africa;
3. Department of Crop Production, University of Swaziland, Luyengo Campus, Swaziland;
4. Department of Biological and Environmental Sciences, Walter Sisulu University, South Africa;
5. Department of Agronomy, University of Fort Hare, Alice, South Africa