Abstract
Under conditions controlled at 25°C and 70% r.h. and under outdoor conditions in southern England, the storage insect pests Sitophilus granarius (L.), Oryzaephilus surinamensis (L.), Cryptolestes ferrugineus (Steph.) and Ephestia elutella (Hueb.) were unable to breed or to survive for long on blocks of compressed, dried forage (grass or legume). The beetles Ptinus tectus Boield. and Trigonogenius globulus Sol. were able to breed on this material under both sets of conditions, but Stegobium paniceum (L.) only at 25°C. At the higher relative humidities associated with outdoor conditions the moths Hofmannophila pseudospretella (Staint.) and Endrosis sarcitrella L. produced thriving cultures. The damage caused by S. paniceum and the moths was severe; in particular, H. pseudospretella completely destroyed the foodstuff during 1 yr of storage at ambient outdoor shade temperatures in Britain.
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