Abstract
The rearing of twelve coleopterous secondary pests of stored grains and one species of grain psocids was tested under the condition of 30°C and 70-80% RH on the five kinds of milk powder on the market. The five coleopterous species, Tribolium castaneum, Cryptolestes pusiiius, Tribolium confusum, Oryzaephilus mercator and Oryzaephilus surinamensis, grew quite well and produced many progenies on milk powder. For the other five coleopterous species, Lasioderma serricorne, Gnathocerus cornutus, Palorus subdepressus, Patorus ratzeburgii and Alphitobius diaperinus and one grain paocid, Liposcelis bostrychophilus, milk powder was a poor diet and only some growth had taken place and small numbers of specimens had completed development. Milk powder proved a very unsatisfactory food for the rest. Stegobium paniceum and Latheticus oryzae did not produce any living larva. Adding water to milk powder was not necessary for insects to grow, although an addition of water showed favour to reproduction in a few species.
