Are pest regulation and erosion alleviation services conflicting or synergistic? Lessons from Sahel pearl millet

Ratnadass, A and Kadi-Kadi, H and Salha, H and Mato, A and Idrissa, A and Hamidine, S and Oumarou, I and Fatondji, D (2014) Are pest regulation and erosion alleviation services conflicting or synergistic? Lessons from Sahel pearl millet. Agriculture, Ecosystems & Environment, 186 (-). pp. 144-147. ISSN 0167-8809

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From 2010 to 2011 in Niger, the effects of a wind erosion-alleviating practice, i.e. mulching pearl millet fields with crop residue, on populations of and damage induced by millet stem borer (MSB), head miner (MHM), and head scarab (MHS) were studied. Significant differences in the survival of MSB diapausing larvae in millet stems at the end of the dry season were found at both Sadore and Doukoudoukou. At Sadore, mean MSB larval survival in the treatment where stems were exported at harvest and stored on platforms (treatment 1) was 1.2/stem, i.e. significantly higher than in all other treatments. Survival was between 0.1 and 0.2 larva in treatments 2 (with millet stems left standing from harvest throughout the dry season) and 3 (with millet stems flattened toward the end of the dry season, four months after harvest). It was less than 0.1 larva in treatments 4 (with millet stems flattened in the middle of the dry season, two months after harvest) and 5 (with millet stems flattened at the beginning of the dry season, at harvest). At Doukoudoukou, mean MSB larval survival in treatment 1 was 0.14/stem, i.e. significantly higher than in treatments 4 and 5 (0.02–0.03 larva), with intermediary findings obtained in treatments 2 and 3 (0.04–0.08 larva). The population and biomass of diapausing MHM pupae and of MHS larvae in the soil were low at both locations, and not affected by crop residue management. Thus, crop residue management whereby stems were left standing until the end of the dry season did not enhance control of millet head pests via increased predator activity, while it increased MSB survival in stems.

Item Type: Article
Divisions: RP-Dryland Cereals
CRPS: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: Coniesta ignefusalis; Heliocheilus albipunctella; Rhinyptia infuscata; Crop residue; Mulching; Wind erosion; Erosion, Pearl millet
Subjects: Mandate crops > Millets > Pearl Millet
Depositing User: Mr Ramesh K
Date Deposited: 03 Mar 2016 05:31
Last Modified: 03 Mar 2016 05:31
Official URL:
Acknowledgement: These studies were funded by the Bill & Melinda Gates Foun-dation (BMGF), as part of the “HOPE for Dryland Cereals” project,and by ICRISAT and CIRAD core-budgets. We are grateful for thetechnical and administrative support from the Director of NationalAgricultural Extension Service in Niamey, the Regional Directorfor Agricultural Extension at Tahoua, the Director of INRAN/CERRATahoua and the Head of INRAN Konni research station for mak-ing the arrangements to conduct the field experiments at theDoudoudoukou Seed Multiplication Center. We also thank D. Man-ley for English revision.

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