Although the Larger Grain Borer develops best at high temperature and relatively high humidity, it tolerates dry conditions, and may develop in grain at low moisture in contrast to many other storage pests, which are unable to increase in number under low moisture conditions. For this reason, infestations of the larger grain borer usually found together with other storage pests, is the predominant under dry conditions. The adult beetle is 3 to 4.5 mm long and dark brown in colour. It has a cylindrical body shape, when viewed from above the rear of the insect is square shaped. The thorax bears rows of teeth on its upper front edge and the head is turned down underneath the thorax so that it cannot be seen from above. The female lays 30 to 50 eggs into the produce (maize, cassava, etc).
Good store hygiene is very important in limiting infestation. Clean store thoroughly between harvests. Remove and burn infested residues before the new stock is stored. Immerse used sacks in boiling water to eliminate residual infestations. Eliminate residual infestation in the wooden structure of the store by removing timber or by fumigating the whole store under a gas-tight sheet. Chemical: Actellic Goldust and fumigation with Aluminium Phosphate tablets.