Integrated Control of Poplar Canker in Poplar Shelterbelts in Wuwei, Gansu Province

Poplar (Populus spp.) canker severely threatens poplar shelterbelt stability in Wuwei, Gansu. Field experiments were conducted from 2024 to 2025 to screen 16 single fungicides and 10 compound formulations via spray and smearing, using lesion inhibition and callus formation rates as core criteria, and establish a precise hierarchical control scheme. Results showed preventive agents (300-fold Bordeaux mixture, 45% lime sulfur mixture) achieved >75% control efficacy. 43% tebuconazole and 1.8% xinjunamine acetate had the strongest bacteriostatic effects, while compound systems combining fungicides, penetrants and immune inducers showed >88% efficacy. A four-grade precise control strategy was finally established, providing technical support for eco-friendly poplar canker control in arid Northwest China.