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Penetration of Sitophilus zeamais (Coleoptera: Curculionidae) through diatomaceous earth-treated bulk maize grain

Penetration of Sitophilus zeamais (Coleoptera: Curculionidae) through diatomaceous earth-treated bulk maize grain

Mvumi, Brighton M., Stathers, Tanya, Golob, P. and Giga, D.P. (2006) Penetration of Sitophilus zeamais (Coleoptera: Curculionidae) through diatomaceous earth-treated bulk maize grain. International Journal of Tropical Insect Science, 26 (1). pp. 28-34. ISSN 1742-7584 (doi:10.1079/IJT200694)

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Abstract

The penetration of adult Sitophilus zeamais Motschulsky through maize grain bulks (0.75m deep), treated with Protect-Itw, a diatomaceous earth (DE) at 0, 0.05, 0.1 and
0.2% (w/w), was determined 12 weeks after weevils were released at the upper surface of the grain. Maize was stored in columns in polyvinyl chloride (PVC) pipes, under
controlled conditions of 26 ^ 28C and 70 ^ 10% RH. Grain samples were collected from various pre-determined depths and the numbers of S. zeamais adults counted. Differences
in insect numbers between treatments and at different depths from which samples were collected were highly significant (P , 0.001). The bottom 2–3 layers (0.65–0.75m deep)had significantly more insects than the upper layers for all the DE concentrations. No significant differences in total insect numbers (live þ dead) were found between the DE concentrations. Dead S. zeamais weevils were found at the bottom of grain treated with Protect-Itw, indicating that insects can penetrate through DE-treated grain 0.75m deep but then subsequently die. There was no strong evidence that DEs admixed with bulk grain restrict S. zeamais movement within the grain

Item Type: Article
Additional Information: Published on behalf of ICIPE African Insect Science for Food and Health
Uncontrolled Keywords: Sitophilus zeamais, diatomaceous earth, grain protectant, vertical insect movement, bulk maize
Subjects: S Agriculture > S Agriculture (General)
H Social Sciences > HD Industries. Land use. Labor
S Agriculture > SB Plant culture
Faculty / Department / Research Group: Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Food & Markets Department
Related URLs:
Last Modified: 11 Nov 2011 12:06
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/3191

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