Study on the occurrence pattern and colored sticky trapping effect of Fenusella taianensis Xiao & Zhou

In order to understand the occurrence pattern of Fenusella taianensis Xiao & Zhou in the Wuwei area and to efficiently use sticky traps for adult trapping and monitoring, we selected two fixed monitoring points at different altitudes to research their life history and population dynamics through a combination of field cocoon digging, laboratory observation, and field investigation. The trapping effects of different colored sticky traps and their different hanging methods were compared. The results showed that: (1) F. taianensis occurred one generation per year in the Wuwei area, with adult insects first appeared in early to mid-April and finally reached the end of April or early May. The peak period of occurrence was short and relatively concentrated, and the eclosion period varied slightly due to differences in altitude. Sticky traps of all 9 colors were effective in attracting F. taianensis adults, with the yellow-green traps being the most effective, capturing 2951.33 and 4450.33 insects per trap at the two monitoring sites, respectively. The yellow and green sticky traps were the next most effective, both capturing above 2000 insects per trap. The impact of all colored sticky traps on natural enemies was relatively small, with the highest number of natural enemies attracted being only 10.33 insects per trap. (3) Sticky traps facing south captured the highest number of F. taianensis adults, exceeding 1500 per trap at both sites, significantly higher than those facing north, west, and east. Traps facing north captured the fewest adults, ranging from 300~400 per trap. Regarding hanging height, the highest number of adult insects were captured at 100 cm above the ground, with 1273.33 and 1591.33 per trap, respectively. The second highest number was at the height of 150 cm, and there was no significant difference between the two. Traps placed at 0 cm captured the fewest adults. Regarding placement within the forest, the closer the sticky traps was to the edge of the forest, the more adults of F. taianensis were attracted, with the highest number at the edge of the forest (1527.00 and 1878.33 per trap, respectively). The lowest number of adult insects was observed at 40 meters from the edge of the forest, all below 200 per trap. This result has guiding significance for the green prevention and control of F. taianensis adults.