THE REPQRT itself is a short document which gives a brief summary of the many lines of investigation being undertaken by the Institute at its four laboratories at Kano, Lagos, Ibadan and Port Harcourt. Detailed accounts of the major lines of work are presented as Technical Reports which are attached to the Report as appendices. Not surprisingly, much of the work of the Institute is focused on the major Nigerian export crops and so groundnuts, cocoa and oilpalm products have received their fair share of attention. Suction traps have been used to assess the relative abundance of storage pests in groundnut stores at Kano and Lagos. The traps were operated throughout the year, and a good picture obtained of the seasonal infestation pattern with respect to several storage pests. A small scale apparatus is described for assessing the permeability of fumigation sheets to methyl bromide and another apparatus has been developed for testing the permeability of paints to the same gas. Work on oilpaim products has been concerned with the bleachability of oil and discoloration of palm kernels. A survey of insect infestation in palm kernel stores was also carried out. The temperature and moisture changes taking place in a large stack of cocoa in a Lagos store were followed over a three month period; this has given some of the basic storage data which are generally so lacking for tropical storage. The work on local food crops was largely focused on maize and cowpeas. Insecticide sprays were applied to maize at time of silking in an effort to reduce damage to maize ears by ‘field’ pests and to reduce field infestation by Sitophilus eeamais and other storage pests. This work is of very great interest to many stored product workers in other countries and it is hoped the investigation will continue. Of particular interest are the comprehensive lists of insects associated with stored products in Nigeria which bring up to date all previous records. There are three lists, the insects being classified alphabetically, by families and by the products with which they are associated. This Report highlights the great variety of storage problems that exist in tropical countries and will be of very great interest to all who are concerned with the storage of produce under tropical conditions. P. E. Tropical Stored Products Centre, Ministry of Overseas Development, Slough, Bucks., England. 79