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The effect of Brachiaria rows on stem borer damage on sorghum in Eastern Amhara, Ethiopia

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Abstract

The lepidopteron stemborer (Chilo partellus) and parasitic Striga weed (Striga hermonthica) caused major yield losses in subsistence sorghum production in the Eastern Amhara Region, Ethiopia. This study evaluated different number of Brachiaria (Mulato II) rows planted around sorghum plots. Desmodium intortum intercropped with sorghum in each Brachiaria row. The study was conducted on 61 farmers’ fields in 2017 and 2018. The treatments were arranged as one row Brachiaria + Desmodium, two rows Brachiaria + Desmodium, three rows Brachiaria + Desmodium and mono-sorghum. The pooled two years and three locations data showed a significant difference (P < 0.001) between push-pull and mono-sorghum plots. Sorghum damage of 17.2%, 16.4%, 33.6% in three, two and one rows of Brachiaria, respectively. The mean number of Striga was significantly reduced in push-pull plots (3 Striga/m2) as compared to mono-sorghum plots (15 Striga/m2). In addition, significantly high sorghum grain yields were recorded in three rows (4.5 t /ha) and two rows (3.7 t/ha) of Brachiaria. Yield increments of 104.2% and 62.2% and 50.0% over mono-sorghum were recorded in three, two rows and one row of Brachiaria, respectively. In addition to sorghum yield increment, farmers were able to get a dry biomass yield of 1.7-24.6 t/ha in different rows of Brachiaria and 0.47-2.43 t/ha of Desmodium for their livestock feed. The three rows of Brachiaria were superior to the other rows, but farmers could also use the two rows as an alternative option with the combination intercropped Desmodium.

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Acknowledgement

The authors highly appreciate CCRP-McKnight foundation and Institute for sustainable development as a partner for transiting the research budget from McKnight to Wollo. Dr. Beth Medvecky, Prof. Linnet Gohle, and Mr. Tesfahun Fenta are thanked for their assistance with the project and review of the manuscript. Wollo is also grateful for their vehicle assistance during the project's implementation. Our thanks are also extended to the experts and development agents of districts and peasant associations of the study area.

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Correspondence to D Asmare.

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Asmare, D., Muluken, G., Seid, H. et al. The effect of Brachiaria rows on stem borer damage on sorghum in Eastern Amhara, Ethiopia. Int J Trop Insect Sci 42, 2065–2071 (2022). https://doi.org/10.1007/s42690-021-00637-x

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