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Efficacy of different hermetic bag storage technologies against insect pests and aflatoxin incidence in stored maize grain

Published online by Cambridge University Press:  26 March 2021

Kimondo Mutambuki  and
Paddy Likhayo Open the ORCID record for Paddy Likhayo [Opens in a new window]
Kimondo Mutambuki*
Affiliation:
Kenya Agricultural and Livestock Research Organisation (KALRO), Food Crops Research Institute-Kabete, P O Box 14733-00800, Nairobi, Kenya
Paddy Likhayo
Affiliation:
Kenya Agricultural and Livestock Research Organisation (KALRO), Food Crops Research Institute-Kabete, P O Box 14733-00800, Nairobi, Kenya
*
Author for correspondence: Kimondo Mutambuki, Email: kimondo.mutambuki@kalro.org; mutambukikimo@yahoo.com
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Abstract

The performance of six grain storage technologies for the control of insect pests in maize was evaluated over a 36-week (9-month) storage period. The six technologies used were: two ZeroFly® hermetic bag brands (laminated and non-laminated); Purdue Improved Crop Storage (PICS) bag; non-hermetic ZeroFly® bag; woven polypropylene (PP) bag containing maize grain treated with Actellic Gold® Dust (pirimiphos-methyl 1.6% + thiamethoxam 0.3%) and woven PP bag containing untreated grain. Each bag was filled with 50 kg maize grain and four replicates of each were set up. With the exception of the non-hermetic ZeroFly® bag, 50 live adults of the larger grain borer Prostephanus truncatus and of the maize weevil Sitophilus zeamais, were introduced into all the bags. Insects were not introduced into the non-hermetic ZeroFly® bag to assess its effectiveness in repelling infestation from outside. Parameters recorded were gas composition (oxygen and carbon dioxide) levels inside the bags; weight of flour generated by insect feeding activities; grain moisture level; live adult insect counts; grain damage and weight loss; grain germination rate and aflatoxin level. At termination, the plastic liners of the hermetic bags were examined for perforations. Results show that oxygen depletion and carbon dioxide evolution were faster in ZeroFly® hermetic compared to PICS bags. Throughout the 36-week storage trial, grain damage remained below 4% and weight loss below 3% in all the treatments except in the untreated PP bags in which it increased to 81.1 and 25.5%, respectively. The hermetic PICS, ZeroFly® and Actellic Gold dust-treated PP bags maintained grain germination at 60%, which was lower than the initial 90%, while in untreated control, it reduced to 4.7%. The mean aflatoxin levels fluctuated between 0.39 and 3.56 parts per billion (ppb) during 24 weeks of storage in all the technologies tested, which is below the acceptable maximum level of 10 ppb in maize. Based on the evaluation results, it can be concluded that hermetic PICS and ZeroFly® bags and woven PP bag with Actellic Gold dust-treated grain effectively protected stored maize grain from insect attack and weight losses. Appropriate strategies and mechanisms for the effective and efficient adoption of hermetic storage bag technology at scale would contribute towards global food security.

Keywords

Aflatoxinhermetic storage bagsProstephanus truncatusSitophilus zeamaisweight loss
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 111 , Issue 4 , August 2021 , pp. 499 - 510
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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