Sitophilus granarius (Curculionidae): outdoor occurrence in vicinity of a grain store

The aim of this work was to explore the frequency and abundance of Sitophilus granarius occurring outside a grain store. Wheat bait-traps were used for pest monitoring. Bait-traps exchange was carried out monthly throughout the year. Exposed bait traps were analysed in the laboratory and stored for subsequent adult incubation (27°C, 75% r.h.) for l month. The long-term outdoor occurrence of S. granarius was documented in the Czech Republic for the first time. This highly mobile internal grain feeder was the dominant pest in comparison to 8 other species of Coleoptera found outside the grain store. The weevils were captured in grain baits almost throughout the year. There were differences in weevil's abundance and frequency depending on bait trap location. The population of granary weevil in baits from hidden infestation (eggs) increased 10 - 50 times after one month of incubation period compared to primary infestation.