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Poplar ulcer disease control
Poplar canker disease typically occurs during the transplanting of seedlings. The disease usually starts in late March, reaches its peak between mid-April and late May, and then gradually declines 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 sections of the trunk. In the early stages, small blisters appear 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 beginning to rot. If the lesion spreads around the entire circumference of the trunk, the tree will eventually die.
Poplars are more susceptible to this disease when their growth is weakened. To manage the disease effectively, several control measures can be taken. First, it is important to use strong, healthy seedlings for planting. When lifting and transporting seedlings, care should be taken to avoid root damage and to maintain proper moisture levels. Before planting, the roots can be treated with ABT3 rooting powder solution, and a layer of water should be placed at the bottom of the planting hole. After planting, a 1000-fold dilution of 5406 cytokinin can be sprayed on the young trunks. Second, in spring, the lower part of the trunk should be coated with white paint or sprayed with a 0.5° Baum lime sulfur solution or a 1:1:160 Bordeaux mixture to prevent infection and reduce disease incidence. However, if the infection rate exceeds 50%, these treatments may not be effective, and more aggressive measures such as pruning or removal might be necessary.