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...Project proposal agricultural engineering field assessment of the efficacy and persistence a locally occurring raw diatomaceous earth in protecting maize cowpeas on small scale farms under semi arid conditions by modreck gomo rj supervisor dr b m mvumi faculty agriculture department soil science october introduction background farmers zimbabwe incur losses to stored grain as result insect damage excess have been reported some world s developing countries where this food is most needed hall may loose up their due pest during one storage season months giga et al with at such rates security country will be threat causes both weight quality according least use synthetic insecticides protect from attack however these can contamination putting consumers health risk they also present workers application does great potential offer an alternative method protection des are inert dust origin consist fossils phytoplanktons diatoms which mainly composed amorphous hydrated silicates quarles winn whe...