Environment-friendly methods for trapping cotton bollworm,Helicoverpa armigera

Non-chemical methods for controlling moths of Helicoverpa armigera in cotton were studied in Shandong Province in eastern China.Black light traps,sex pheromone traps and poplar branch traps were used in a 2-year study.Moths trapped by 4 different methods,including 1 light trap + 10 sex pheromone traps,1 light trap + 5 sex pheromone traps +5 poplar branch traps,1 light trap + 10 poplar branch traps and only 1 light trap,were 11.4,10.4,8.6 and 7.0 per day,respectively.There was no enhancement was showed for trapping moths by black light trap combined with sex pheromone traps or poplar branch traps.The relationship between day number of the year and accumulative number of cotton bollworm moths trapped by different trapping measures can be described as Gompertz model.Number of cotton bollworm moths trapped by light trap equipped with a time controller(17.4) and simple light trap(19.9) per day showed no significance.Adults of predatory ladybeetle trapped by light trap equipped with a time controller per day were less than that of simple light trap.It indicated that saving the work time(4 h) of light trap can prevent more predatory ladybirds from simple light trap.Light trap which equipped with a time controller can prevent nearly 50% predatory ladybirds from simple light trap and save about 40% electricity power.Light trap would attract more moths and less predatory ladybirds by opening the light at 19:00-23:00 and 3:00-5:00.