Evaluation on Attractant Effect of Different Lures on Psocids in Bagged Paddy Rice

To develop an effective trap for psocid detection and to study population dynamics of psocids in bagged stacks of grain, the attraction effect of different lures on psocids was evaluated in a store with bagged grain. Five kinds of lures combined with cone-shaped traps were set in different areas in a flat warehouse with bagged paddy rice. Results showed that with the grain temperature of 21.1-24.8 ℃, Liposcelis entomophila was the dominant species of stored grain pests, and number of trapped psocids was 14-151 per week per trap across different lures. Among them, lures C and D were the most attractive to psocids. In comparison with the sampling method, traps could attract more psocids and their trapping results had higher relationship with the grain temperature. High trapping efficacy of lures C and D could last for seven weeks. Compared with the eastern, western, northern and central trapping areas, more psocids were trapped in the southern area of the warehouse in the summer. Trapping results of lure D had the highest relationship with the population dynamics of poscids. The lure D with porous starch and agar as release carrier has great potential in the population monitoring of stored grain psocids.