International Journal of Tropical Insect Science

, Volume 37, Issue 4, pp 243–258 | Cite as

Bioefficacy of enhanced diatomaceous earth and botanical powders on the mortality and progeny production of Acanthoscelides obtectus (Coleoptera: Chrysomelidae), Sitophilus granarius (Coleoptera: Dryophthoridae) and Tribolium castaneum (Coleoptera: Tenebrionidae) in stored grain cereals

  • Charles AdarkwahEmail author
  • Daniel Obeng-Ofori
  • Vanessa Hörmann
  • Christian Ulrichs
  • Matthias Schöller


Food losses caused by insects during postharvest storage are of paramount economic importance worldwide, especially in Africa. Laboratory bioassays were conducted in stored grains to determine the toxicity of powders of Eugenia aromatica and Moringa oleifera alone or combined with enhanced diatomaceous earth (Probe-A® DE, 89.0% SiO2 and 5% silica aerogel) to adult Sitophilus granarius, Tribolium castaneum and Acanthoscelides obtectus. Adult mortality was observed up to 7 days, while progeny productionwas recorded at 6–10 weeks. LD50 and LT50 values for adult test insects exposed to plant powders and DE, showed that A. obtectus was the most susceptible towards the botanicals (LD50 0.179% and 0.088% wt/wt for E. aromatica and M. oleifera, respectively), followed by S. granarius. Tribolium castaneum was most tolerant (LD50 1.42% wt/wt and 1.40% wt/wt for E. aromatica and M. oleifera, respectively). The combined mixture of plant powders and DE controlled the beetles faster compared to the plant powders alone. LT50 ranged from 55.7 h to 62.5 h for T. castaneum exposed to 1.0% M. oleifera and 1.0% DE, and 0.5% E. aromatica and 1.0% DE, respectively. Botanicals caused significant reduction of F1 adults compared to the control. Combined action of botanical insecticides with DE as a grain protectant in an integrated pest management approach is discussed.

Key words

Toxicity Acanthoscelides obtectus Sitophilus granarius Tribolium castaneum plant powders DE 


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© ICIPE 2017

Authors and Affiliations

  • Charles Adarkwah
    • 1
    • 2
    Email author
  • Daniel Obeng-Ofori
    • 1
  • Vanessa Hörmann
    • 2
  • Christian Ulrichs
    • 2
  • Matthias Schöller
    • 2
    • 3
  1. 1.Department of Horticulture and Crop Production, School of Agriculture and TechnologyUniversity of Energy and Natural ResourcesSunyaniGhana
  2. 2.Division Urban Plant Ecophysiology, Faculty of Life SciencesHumboldt-Universität zu BerlinBerlinGermany
  3. 3.Biologische Beratung GmbHBerlinGermany

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