Skip navigation

Effectiveness of grain storage facilities and protectants in controlling stored-maize insect pests in a climate-risk prone area of Shire Valley, southern Malawi

Effectiveness of grain storage facilities and protectants in controlling stored-maize insect pests in a climate-risk prone area of Shire Valley, southern Malawi

Singano, Charles D., Mvumi, Brighton M. and Stathers, Tanya ORCID: 0000-0002-7767-6186 (2019) Effectiveness of grain storage facilities and protectants in controlling stored-maize insect pests in a climate-risk prone area of Shire Valley, southern Malawi. Journal of Stored Products Research, 83. pp. 130-147. ISSN 0022-474X (doi:https://doi.org/10.1016/j.jspr.2019.06.007)

[img] PDF (Author's Accepted Manuscript)
24207 STATHERS_Grain_Storage_Facilities_Shire_Valley_Malawi_(AAM)_2019.pdf - Accepted Version
Restricted to Repository staff only until 27 June 2020.

Download (1MB) | Request a copy
[img] PDF (Acceptance Email)
24207 STATHERS_Grain_Storage_Facilities_Shire_Valley_Malawi_(Accept_Email)_2019.pdf - Other
Restricted to Registered users only

Download (53kB) | Request a copy

Abstract

Shire Valley is one of Malawi's most vulnerable areas to climate change (CC). In addition to other impacts, CC is expected to affect storage insect pest status, and the efficacy of grain storage facilities and protectants. On-farm grain storage trials were therefore conducted in Shire Valley to assess the performance of storage facilities and grain protectants against storage insect pests. Eight smallholder farmers hosted the trials in Thyolo and Chikwawa districts. Seven grain storage treatments were evaluated for 32 weeks during two storage seasons: Neem leaf powder (NM), Actellic Super dust (ASD), ZeroFly® bag (ZFB), Purdue Improved Crop Storage bag (PICS), Super Grain Bag (SGB), hermetic metal silo (MS) and untreated grain in a polypropylene bag (PP). Insect pest populations and grain damage increased with storage duration and differed significantly between treatments (p < 0.05). Grain stored in hermetic bags (PICS, SGB) sustained significantly lower (p < 0.05) insect damage and weight loss compared to other treatments across sites and seasons. The hermetic bags also outperformed the other treatments in suppressing insect numbers. However, germination rates of undamaged grains stored in the hermetic storage facilities (MS, PICS, SGB) for 40 weeks were extremely low (<15%) compared to that of undamaged grains from NM treatment (53-58%) and the other treatments (>75%) at both sites. The hermetic MS, ZFB bags, ASD and NM treatments did not effectively protect grain from insect damage. High in-store mean temperature (35.6 C) and high initial grain moisture content (13.7%) may have negatively affected efficacy of some treatments and seed germination. Tribolium castaneum survival in the MS requires further investigation. The hermetic storage bags (PICS, SGB) can be recommended for long-term maize grain storage (>32 weeks) by smallholder farmers in Shire Valley and other similar climate change-prone areas in sub-Saharan Africa.

Item Type: Article
Uncontrolled Keywords: hermetic storage facilities, grain protectants, storage insect pests, insect grain damage and weight loss, germination rate, climate change
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Food & Markets Department
Faculty of Engineering & Science > Natural Resources Institute > Postharvest Science and Technology Research Group
Last Modified: 15 Aug 2019 15:14
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/24207

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics