Distribution and Relative Abundance of Bean Leaf Beetles (<i>Ootheca</i> spp.) (Insecta: Coleoptera: Chrysomelidae) in Uganda
Bean leaf beetles (<i>Ootheca</i> spp.) (Insecta: Coleoptera: Chrysomelidae) are one of Africa’s most destructive pests of common bean and other leguminous crops. The beetles are widely distributed in Africa where they are estimated to cause annual crop yield losses of 116,400 tons of cr...
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| Autores principales: | , , , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/0571297bac6a4d1c8df5db2be3480f5f |
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| Sumario: | Bean leaf beetles (<i>Ootheca</i> spp.) (Insecta: Coleoptera: Chrysomelidae) are one of Africa’s most destructive pests of common bean and other leguminous crops. The beetles are widely distributed in Africa where they are estimated to cause annual crop yield losses of 116,400 tons of crop yields in sub-Saharan Africa. Despite their importance, little is known about the distribution, relative abundance and damage caused by bean leaf beetles in Uganda. As a result, the development of effective management methods has been hampered. We conducted surveys in six key Ugandan agro-ecological zones to determine the species distribution and relative abundance of bean leaf beetles. Findings indicate that leaf beetles belonging to 12 genera are present, including members of the genera <i>Afrophthalma</i> Medvedev, 1980, <i>Buphonella</i> Jacoby, 1903, <i>Chrysochrus</i> Chevrolat in Dejean, 1836, <i>Diacantha</i> Dejean, 1845, <i>Exosoma</i> Jacoby, 1903, <i>Lamprocopa</i> Hincks, 1949, <i>Lema</i> Fabricius, 1798, <i>Nisotra</i> Baly, 1864, <i>Neobarombiella</i> Bolz and Wagner, 2012, <i>Ootheca</i> Dejean, 1935, <i>Parasbecesta</i> Laboissière, 1940, and <i>Plagiodera</i> Dejean, 1835. We identified only three species belonging to the genus <i>Ootheca</i>: <i>O. mutabilis</i>, <i>O. proteus</i>, and <i>O. orientalis</i>. Seventy percent of all the beetles collected were <i>O. mutabilis</i> and these were present in all agro-ecological zones studied. The Northern Moist Farmlands (21.9%), West Nile Farmlands (12.9%), Central Wooded Savanna (4.4%) and Southern and Eastern Lake Kyoga Basin (1.4%) were the only agro-ecological zones where <i>O. proteus</i> was found. Only one specimen of <i>O. orientalis</i> was found at a single site in the Central Wooded Savanna. The Northern Moist Farmlands had a significantly (<i>p</i> < 0.05) higher bean leaf beetle density than the West Nile Farmlands and Southwestern Highlands. Similarly, the Northern Moist Farmlands had the highest beetle foliar damage per plant (1.15 ± 0.05), while the Southwestern Highlands had the lowest (0.03 ± 0.02). We provide the first information on <i>Ootheca</i> species distribution, abundance and damage in Uganda. Our findings provide a foundation for assessing the importance of <i>Ootheca</i> spp. as common bean pests in Uganda. |
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