https://auburnpub.com/lifestyles/eco-talk-the-perils-of-the-bradford-pear-tree/article_f42ffe43-90c6-573f-9748-3beb21511b2a.html

Eco Talk: The perils of the Bradford pear tree

Bradford pear trees. Deposit Photos

Judy Wright Special to The Citizen Jan 23, 2020 Updated 16 min ago

As I write this column today, I am thinking about spring and looking forward to the flowering trees when spring does arrive. I am hopeful, as the up-and-down temperatures of this winter have caused some trees that bloom early to have their flower buds start to swell. I am sure we can remember some springs when the flowering trees either did not flower or their flowers were fewer in number than normal because a hard cold snap that damaged the swollen flower buds.

One of the trees I used to look forward to seeing is now considered by some, and justifiably so, to be an invasive species. Unfortunately, the Bradford pear, also referred to as a callery pear, was planted just about everywhere in the 1990s because of its dense cone shape and white flowers. I recall seeing them everywhere, and how pretty the trees were when flowering. These trees were also chosen, at one time, as the urban tree of the year!

Since then, we have learned that these trees, in spite of their visual appeal, did not come without problems. Imported from China in the 1960s by the U.S. Department of Agriculture as an ornamental tree, they produce an unpleasant scent when flowering. Also, the branches and even the trunks are very weak and can break under snow, ice and even a strong wind. To counteract this weakness, other varieties of the Bradford pear were quickly introduced.

At the time of their introduction as an ornamental tree, it was assumed the Bradford pear trees were sterile and would not produce any fruit. Part of that was correct, they do not produce fruit. however, as the newer, stronger varieties were introduced, it was later learned that they would cross-pollinate with the older varieties, and now they have become an environmental threat in eastern forests. Apparently, the newer varieties of Bradford pears would produce fruit that birds would eat, carry into the forest and deposit the seeds, which would grow.

As the seeds grow into seedlings, the new plants carry the older genetics of the older callery pears, which produce thorns measuring up to 4 inches. It is reported that these thorns are very sturdy and can even destroy tractor tires! Once established, the thickets take over native forest trees like dogwoods, maples, oaks and redbud. Many of these native tree species produce fruit that is nutritious and palatable to birds and other animals, while the callery pear fruit has little nutritional value.

So now you may realize you have a problem growing in your landscape and want to get rid of it. Suggested steps are to first cut the tree down and grind the root out. They will produce shoots or suckers from any remaining root pieces, so you will need to be vigilant and mow them off. They will continue to send shoots up for at least two years before all the root reserves are exhausted. Be vigilant!

Once the shoots have stopped, consider replanting something more environmentally beneficial, such as maple or other shade trees. Redbuds or serviceberry will provide spring flowers, and Japanese maples are visually appealing. Many landscapers realize the damage the Bradford pears are causing and will not plant them. Recognizing the serious environmental problems the Bradford pears were causing, the state of Ohio passed legislation in 2018 stopping the sale or distribution of any callery pears by 2023.

By the way, there are reported to be about 3,000 species of pear worldwide. Pears are relatives of apples and are a member of the rose family. They are native to Asia and Europe, and are reported to have arrived in America with the colonists when New England was settled in the 1600s.

Unfortunately, this is not the first time, nor will it be the last, that I will write about an invasive species that we should be aware of. Invasive species are a significant problem all around the world. According to the U.S. Fish and Wildlif/e Service, invasive species are costing the U.S. billions of dollars in damages each year.

While this is staggering, if we each take time to learn about invasive species and then take steps to control those we can manage, such as removing Bradford pear trees even though they are pretty to look at when flowering, we may be able to stem the loss of valuable native species.

Judy Wright is the senior agriculture specialist with Cornell Cooperative Extension of Seneca County. For more information, visit senecacountycce.org or call (315) 539-9251 ext. 109.

What if we gave email addresses to our campus trees? https://www.theatlantic.com/technology/archive/2015/07/when-you-give-a-tree-an-email-address/398210/

1. Purchase of Census Materials (06/30/18): We have purchased all the equipment and materials needed for the census. Some additional small purchases may be needed near the completion of the census (nails, tags, replacement tape measurements and flagging tape) due to wear and tear.
2. Recruitment of undergraduate student census workers (08/14/18). We recruited 34 undergraduate students from SIB, NRES, AHS and Animal Sciences to work on the census. Students spent 4-8 hours a week tagging, mapping and identifying trees. So far, we have recruited 33 students to work on the census during Spring semester 2019. About half will be returning students and will both work on the census and do independent research projects in Trelease related to the census.
3. Student orientation and training (08/21/18): Training was completed as planned. In addition we gave students quizzes on the census methods and spent time in the field with the students throughout the semester.
4. Development of project website (10/15/18): We have initiated the website. We will continue to build content for the website during the first part of the Spring semester whilst it is too cold to do the census.
5. Completion of the first 12 ha of census (11/9/18): We started the census at the south side of Trelease woods, which has very high stem densities. This has slowed down progress through the plot. We have now completed around 4 ha. We will resume work when temperatures warm later in the Spring semester. We anticipate requesting additional funds this summer from LAS and ACES to allow students to work on the census over the summer break.

Here is an update on the progress of the tree inventory. Tree Count - 1,117

Progress

I began on the north side of campus as we discussed in our kickoff meeting, and have started working south. I have completed most everything north of Green St. I will continue to work my way south next week. See attached file.

Next week I will also start to do some data quality checks and will include some of that reporting in these update emails. If you have any questions, please let me know.

Reid Gibson, Project Manager, Davey Resource Group, ISA Certified Arborist/Municipal Specialist, IL-5319AM ISA, Tree Risk Assessment Qualified

The purchase order to hire Davey Trees for the Tree Inventory update was submitted Feb. 21, 2018.  The Davey Tree staff are planning to start the inventory in April 2018, and complete it this summer.

The iCAP WOrking Group (iWG) met on February 23rd, 2017, to discuss and start the assessment of SWATeam recommendation ALUFS002 Campus Tree Inventory. Their official comment on this recommendation was:

"The iCAP Working Group supports the use of the Carbon Credit funds for a tree inventory update."

See attached the iWG assessment complete with official comments from all the iWG members.

See SWATeam ALUFS002 Recommendation.