THE BIOLOGY OF CRYPTOLESTES UGANDAE STEEL & HOWE (COLEOPTERA, CUCUJIDAE), A PEST OF STORED PRODUCTS IN AFRICA

Authors


SUMMARY

  • 1Cryptolestes ugandae is a pest of cereals and groundnuts and is at present confined to East and West Africa.
  • 2To assess the possibility of its becoming a serious pest, the rates of development, mortality and reproduction have been studied in the laboratory at various constant temperatures and humidities.
  • 3Development was most rapid at 30°C., 90 per cent r.h. and developmental mortality was least at 25°C.-27·5°C., 90 per cent r.h.
  • 4Males on emergence were heavier than females under most conditions and their weight was more affected by temperature than that of females, being heaviest at intermediate temperatures and high humidities.
  • 5Crowding of larvae caused a marked increase in their developmental period.
  • 6The intrinsic rates of increase were calculated from the experimental results; at its quickest a population could double its numbers in seven-and-a-half days.
  • 7Because of its relatively high humidity requirements, C. ugandae is unlikely to became as widespread a pest as C. minutus or C. ferrugineus.

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