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Evaluation of Purdue Improved Crop Storage Triple Layer Hermetic Storage Bag against Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) and Sitophilus zeamais (Motsch.) (Coleoptera: Curculionidae)

1
Kenya Agricultural and Livestock Research Organisation (KALRO), Food Crops Research Institute-Kabete, P.O. Box 14733-00800, Nairobi, Kenya
2
West and Central Africa Council for Agricultural Development (CORAF), 7, Avenue Bourguiba-B.P. 48, CP 18523, Dakar, Senegal
3
Purdue University, West Lafayette, IN 47907, USA
*
Author to whom correspondence should be addressed.
Insects 2019, 10(7), 204; https://doi.org/10.3390/insects10070204
Received: 2 April 2019 / Revised: 25 June 2019 / Accepted: 26 June 2019 / Published: 12 July 2019
(This article belongs to the Special Issue Improving Stored Product Insect Pest Management)
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Abstract

Hermetic technologies are being promoted in Africa as safer and more effective methods of grain storage on smallholder farms. However, farmers and policy makers lack knowledge of their efficacy in controlling major stored grain pests. An on-station study was conducted to evaluate the triple layer Purdue Improved Crop Storage (PICS) airtight bags against two major storage insect pests. Two sets each of PICS, jute and polypropylene bags were filled with 50 kg maize grain per bag. Each set was replicated four times. One set of PICS bags was each infested with 50 insects each of the larger grain borer P. truncatus and the maize weevil S. zeamais; while the other set was not. One set of jute and polypropylene woven bags was treated with a cocktail of 1.6% Pirimiphos methyl and 0.3% Permethrin, serving as positive controls; while the remaining sets with untreated maize grain formed negative controls. Gas analysis in the PICS bags followed the expected trend with oxygen levels falling sharply below 10% and carbon dioxide increasing to almost 10% after 12 weeks hence resulting in insect death. After 16 weeks, increase in oxygen levels may be attributed to perforation of the bags from outside by the P. truncatus. Results showed that PICS bags were significantly (P < 0.05) superior to treated and untreated controls of polypropylene and jute bags in suppressing insect development, maize grain damage and weight loss during storage. Weight loss in polypropylene and jute bags reached 40% and 41%, respectively, at 24 weeks after storage compared to PICS (2.4–2.9%). These results demonstrate that PICS bags can be used to store maize against P. truncatus and S. zeamais attack. View Full-Text
Keywords: PICS bags; Prostephanus truncatus; Sitophilus zeamais; grain storage; smallholder farmers PICS bags; Prostephanus truncatus; Sitophilus zeamais; grain storage; smallholder farmers
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Mutambuki, K.; Affognon, H.; Likhayo, P.; Baributsa, D. Evaluation of Purdue Improved Crop Storage Triple Layer Hermetic Storage Bag against Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) and Sitophilus zeamais (Motsch.) (Coleoptera: Curculionidae). Insects 2019, 10, 204.

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