mulberry trees leak "black oil", professionals solve residents' worries
2024-09-25
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"hello, there is a mulberry tree in front of my house. recently, a black liquid has been dripping from the tree. when we sit under the tree and chat, we always get it all over us, and we can't wash it off. can the community come and take a look?" recently, mr. deng, who lives in the west bungalow at no. 32 fuxing road, wanshou road sub-district, reported the residents' troubles to the community.
the black stains left on the ground after the "black tree oil" flowed downzhang yuanyuan, a social worker in charge of the area, rushed to the scene to check the situation. she looked up in the direction of the resident's finger and found that there was a thick broken branch on the 7-8-meter-tall mulberry tree that was leaning outwards. black liquid was flowing down and dripping onto the ground, leaving a large black stain that could not be washed away with water. "can we use something like cement to cover the broken branch?" a resident at the scene suggested.
the social worker first contacted the property management, but because the tree was too tall, the property management lacked the conditions for operation. so the social worker contacted the greening team through the street. two masters from the greening team quickly came to the community. "this situation is very common. we call this phenomenon 'tree oil flow'." after checking the situation on the scene, master lan from the greening team explained, "the 'wound' left after the previous pruning of the branches has not yet healed completely. this summer, there was a lot of rain, and the roots absorbed a lot of water, so 'tree oil flow' will occur. generally, after a thick branch is cut off, the cross-section is larger, and this problem will occur, and the 'wound' cannot be healed all at once."
the greening team's master handles "black tree oil"then master lan said that it is not appropriate to use the "cement paste" method to solve the problem at present. "after the paste, the branches are not breathable and are prone to rot and die." then, master lan cut the broken branches again, making the cross section of the branches as close to the main trunk as possible, so that the "black tree oil" that flows down can flow along the trunk into the soil and no longer affect the activities of residents under the tree. "when the weather turns cooler, the tree's 'wounds' will heal faster, and the 'tree oil' should stop flowing soon." master lan said.
source: beijing daily client
reporter: xu yingbo
