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Effectiveness of two diatomaceous earths (FossilShield® and SilicoSec®) against Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae) infesting two maize varieties (CLH103 and SHABA) at storage – IJAAR

Fotso Tagne Gabriel, Tofel Haman Katamssadan, Nukenine Elias Nchiwan, Adler Cornel

Department of Biological Sciences, University of Ngaoundere, Cameroon

Department of Biological Sciences, University of Bamenda, Cameroon

Julius Kühn-Institut, Institue for Ecological Chemistry, Plant Analysis and Stored Products Protection, Königin-Luise Str.19, D-14195 Berlin, Germany

Key words: Sitophilus zeamais, Diatomaceous earths, Malathion, Maize variety, exposure periods.


Influence of maize varieties CLH103 and SHABA on the effectiveness of FossilShield® and SilicoSec® against Sitophilus zeamais was evaluated in laboratory. Each product was used at 0, 0.5, 1, 1.5 and 2 g/kg and four exposure periods (1, 3, 7 and 14 days) for adult mortality and F1 progeny production. Damaged and germinated seeds were also assessed. Malathion (positive control) was used at the recommended dosage (0.5 g/kg). Probit analysis showed that FossilShield® and SilicoSec® were more toxic to weevils on CLH103 than SHABA from 3 days post-infestation, while within 1 day post-infestation, the two products were rather more toxic on SHABA than CLH103. Student t-test showed significant difference between the two maize varieties treated with FossilShield® in the reduction of adult emergence at 1 g/kg while with SilicoSec® this difference was observed for all concentrations. Malathion as positive control completely inhibited the development of insects on the two maize varieties. Like Malathion at the single dosage (0.5 g/kg), the number of emerged insects was completely reduced by each diatomaceous earth (DE) at 2 g/kg. FossilShield® (from 1.5 g/kg) reduced completely grain damages in the CLH103 variety, while FossilShield® (2 g/kg) almost reduced grain damages (1.0%). SilicoSec® achieved complete reduction on CLH103 variety, while, on SHABA variety, the reduction of grain damage was significantly different (7.4%). Seed germination was not affect by the DEs. In this study, the results showed that utilization of FossilShield® and SilicoSec® could be favorably considered as alternative solution to Malathion against Sitophilus zeamais.

Get the original articles in Source: Archive for | IJAAR |- May, 2016

Journal Name: International Journal of Agronomy and Agricultural Research (IJAAR)

Published By: International Network for Natural Sciences

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