Evaluation of trap colour, hanging height and position on the effectiveness of trapping Tuta absoluta (Meyrick).
Objective: To investigate the effects of trap color, hanging height and hanging position on the trapping effect, and to provide a basis for the green prevention and control of tomato leaf diving moth. Methods: In this study, specific sex attractants were used as experimental materials, and behavioral ecology techniques were adopted to conduct a comparative study on the trapping effects of sex pheromone traps (plane traps) on tomato leaf miner moth in organic vegetable production shed. Results: 4 kinds of color: blue, green, yellow and white sex pheromone traps could trap a certain quantity of tomato leaf moth, 1 d average daily trap quantity among the 4 kinds of color traps from high to low in turn was blue 65.4, green 59.7, white 47.4, yellow 30.9. In terms of daily amount of trap, the highest was blue trap. The order was blue and green > white > yellow trap, and the difference was significant. There were significant differences in the proportion of the daily amount of traps with different colors, and the order was blue > green > white > yellow. The average daily trapping quantity of the three kinds of high hanging sex pheromone traps was 125.1 at 40 - 60 cm, 96.1 at 90 - 110 cm and 65.1 at 140 - 160 cm, respectively, with the highest daily trapping quantity at 40 - 60 cm. The order was 40-60 cm > 90-110 cm > 140-160 cm, the difference was obvious. The proportion of moths captured by traps at different hanging heights at 40 - 60 cm was significantly higher than at the other two hanging heights, and the order was 40 - 60 cm > 90 - 110 cm > 140 - 160 cm. The 35 d average daily trapping quantity of the three kinds of traps was 103.0 at the air vent, 66.6 at the exit and 71.4 at the place far from the air vent. The highest daily trapping quantity was at the air vent, which was in the order of air vent > far from the air vent > the entrance and exit, and the difference was obvious. The proportion of the trapping amount of the traps in different hanging positions was significantly higher than those in the other two hanging positions, which was in the order of air outlet > entrance and exit and far away from air outlet. Comprehensive analysis of the hazard status (number of holes, number of larvae) of the three suspension positions showed: the ventilation outlet > away from the ventilation outlet > entrance and exit. Conclusion: The blue sex pheromone trap (planar traps) placed at 40-60 cm vents has the best trapping effect on tomato leaf miner in vegetable production.