Synergistic trapping effect of mixed lure traps for the main Lepidopteran pests in peach orchards

Abstract: 【Objective】The experiment was carried out to clarify the interactive effect of different lures on trapping main Lepidopteran pests, including Grapholitha molesta, Adoxophyes orana, Conogethes punctiferalis and Lyonetia clerkella, in northern peach orchards, and to provide a scientific basis for the rational mixed use of these pest lures.【Methods】Utilizing four types of sex pheromone lures, a twoyear consecutive investigation (2022—2023) was conducted in peach orchards in the Zhengzhou area to compare the trapping efficiency of different combinations of pest sex pheromone lures and individual pest pheromone lures. There were four treatments per group in the experiment (T1: a single target pest sex pheromone lure in each trap, totaling 4 traps; T2: any combination of two types of target pest sex pheromone lures in each trap, totaling 6 traps; T3: any combination of three types of target pest sex pheromone lures in each trap, totaling 4 traps; T4: a combination of four types of target pest sex pheromone lures in each trap, totaling 1 trap), with a total of 15 traps and 3 sets of replicates. The traps were uniformly distributed in the orchard according to the principle of equidistant placement, and were hung at a height of 1.5 meters above the ground.【Results】In 2022 and 2023, the number of captured G. molesta using G. molesta sex pheromone lures alone were 40.0±10.6 and 57.9±7.6 per trap, respectively. There was no significant effect on the capture of G. molesta when G. molesta sex pheromone lures weremixed with the other three target pest lures. In 2022 and 2023, the combination of A. orana sex pheromone lures with G. molesta sex pheromone lures captured 50.7±12.4 and 16.3±6.8 A. orana per trap, respectively, which was significantly lower than the capture when A. orana sex pheromone lures were used alone, showing 175.6±32.4 and 85.1±13.8 per trap, respectively (p＜0.05). The use of the other two pest lures in combination with A. orana sex pheromone lures had no significant effect on the capture of A. orana. The number of L. clerkella captured in 2022 and 2023 was 28.8±12.5 and 26.1±5.0 per trap when L. clerkella sex pheromone lures were used alone, respectively, and there was no significant effect on the capture of L. clerkella when it was mixed with the other three target pest lures. In 2022, the use of C. punctiferalis sex pheromone lures alone captured the most C. punctiferalis, with a capture rate of 4.0±0.58 per trap, however the capture was significantly reduced when combined with any other three pest lures (p＜0.05). In 2023, the capture of C. punctiferalis was 2.1±0.3 per trap when it was used alone, and there was no significant difference in the capture when it was combined with other pest lures.【Conclusion】When trapping G. molesta, the sex lure of L. clerkella can be mixed with the sex lures of A. orana, C. punctiferalis and L. clerkella; when trapping L. clerkella, the sex lure of L. clerkella can be mixed with the sex lures of G. molesta, A. orana and C. punctiferalis; when trapping A. orana, the sex lure of A. orana can be mixed with the sex lures of L. clerkella and C. punctiferalis, but not with the sex lure of G. molesta.