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Poplar ulcer disease control
Poplar canker disease typically occurs during the seedling transplanting phase. The infection usually starts in late March, reaches its peak between mid-April and late May, and then gradually subsides by early June. A slight resurgence may occur after October. This disease primarily affects the trunks, rhizomes, and large branches, but it mainly targets the middle and lower parts of the trunk. In the early stages, small blisters form near the bark pores, and when they rupture, they release a foul-smelling fluid containing numerous pathogens. Over time, the affected area collapses into an ulcer-like lesion, with the bark turning brown and rotting. When the lesion spreads around the entire circumference of the trunk, the tree eventually dies.
Poplars are more susceptible to this disease when their growth is weakened due to environmental stress or poor care. To manage the disease effectively, several control measures should be taken. First, use strong, healthy seedlings for planting, and handle them carefully to avoid root damage. Keep the roots moist during transportation to maintain their vitality. Before planting, soak the roots in ABT3 rooting powder solution, and water the planting hole thoroughly before placing the tree. After planting, spray the young trunks with a 1000-times diluted solution of 5406 cytokinin to promote recovery and resistance.
In spring, coat the lower part of the trunk with white paint, or apply a 0.5° Baum lime sulfur solution or a 1:1:160 Bordeaux mixture to prevent infection and reduce the disease incidence. However, if the infection rate exceeds 50%, these preventive treatments may not be effective, and more aggressive measures such as pruning or removal might be necessary. Regular monitoring and timely intervention are essential to ensure the health and survival of poplar trees.