International Journal of Agricultural Research and Reviews

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Deltamethrin contact bioassay and boring/chewing tests with the maize weevil, Sitophilus zeamais (Mot).

1Anankware Paarechuga Jacob, 2Melinda Hadi and 2Georgina Bingham




Accepted 16th December, 2014


This paper presents results following contact of Sitophilus zeamais with different storage bags at various exposure times (24 hrs, 48 hrs and 72 hrs) to deltamethrin.  Insect knockdown and mortalities were observed during each exposure period and for up to seven days after the start of the exposure. High knockdown was observed after 6 hours of exposure to the ZeroFly storage bag (>93%). Although some Sitophilus zeamais recovered after initial impact of the exposure, 100% mortality was observed after three (3) days of exposure. Increased exposure times resulted in high mortalities. Whereas no mortality was observed in the untreated Jute throughout the experiment, the control (untreated Ghana-made polypropylene) and untreated India-made polypropylene each recorded a maximum mortality of 1.7%. The ZeroFly bag on the other hand recorded 61.7 after 24 hrs and 100% after 48 hrs of exposure.


Keywords: S. zeamais, P. runcates, mortalities, ZeroFly