Will a Crossbow application harm my neighbour’s fruit trees? Ask an expert

You may have problems with gardening in the fall. For answers, check out Ask an Expert, an online question-and-answer tool from Oregon State University’s Extension Service. OSU Extension Teachers and Master Gardeners respond to questions within two business days, usually less. To ask a question, simply go to OSU Extension Website, enter it and indicate the county where you live. Here are some questions asked by other gardeners. What is your?

Q: I can find a lot of information on what the crossbow kills, but no specific information on how it does it. I’m trying to kill wild blackberries. My yard is in a condominium development and is right next door to my neighbor who doesn’t like herbicides.

She tells me that if I spray the blackberries next to her organic fruit tree, the herbicide will transfer to all the roots of the adjacent plants and kill them. From what I can see, Crossbow acts similarly to Roundup, traveling from the leaves to the roots and only killing or damaging those whose leaves have been sprayed.

Can you give me any information on how it kills plants and if the herbicide is transferable to other plants via the roots? – Clackamas County

A: First of all, I must tell you that Crossbow is not labeled for use in residential yards. You should choose another approach/product in this context, but I want to go further to answer your question.

The crossbow contains two active ingredients: 2,4-D butoxyethyl ester and triclopyr butoxyethyl ester. You can read about their “modes of action” in the NPIC Collection of Data Sheets.

I think you’re wondering, “Will the crossbow hurt my neighbor’s fruit trees?” The answer is probably yes. Crossbow’s label reads, “Do not apply Crossbow directly to or allow direct contact with fruit trees…and do not allow spray mists containing it to drift onto them.”

In another section, “Under conditions conducive to evaporation (high temperatures and low humidity), vapors of this product may damage sensitive crops growing nearby.” here is label information for crossbow.

I’m glad you contacted us before applying. – Kaci Buhl, Pesticide Specialist OSU Extension

Ginkgo leaves. File photo

Q: I asked Friends of Trees to plant a gingko for me in February 2021. I would like to know when I can safely prune it and how to prune it. – Multnomah County

A: Since your ginkgo is relatively new, it should need some pruning at first. Typically, the only pruning cuts you would make in the first few years after planting the tree are to remove dead or damaged branches, or to shape the tree by removing any branches that grow upward. interior or crossing/rubbing.

Dead branches can be safely removed at any time of the year, but all other pruning should be done in late winter or early spring, so the tree can spend the growing season growing. heal cuts. You could start as early as this spring.

For a great resource on caring for new trees, check out the Extension post. Selection, planting and maintenance of a new tree. It includes good diagrams on how to make healthy pruning cuts, as well as general information on when to prune. – Sarah Bronstein, Trainee Master Gardener, reviewed by Elizabeth Records, Education Program Assistant

Q: This year I let my garden stay a little longer. Today is October 25. Will I just waste my cover seed mixture of clover and rye if I plant this week? I wonder if it’s too cool now. – Benton County

A: It’s really too late for clover, but you could just go under the fence with grain rye, winter wheat or winter oats. They won’t grow much until winter, but if they establish well enough to survive, they will grow in the spring. This publication has good information and a planting calendar.

Alternatively, you can simply consider mulching the bed with leaves or other organic matter for the winter, and start your cover crops earlier next year. – Signe Danler, Master Garden Extension Online Coordinator

Springfield Pollinator Gardens

The gardener looks for plants that will attract pollinators. File photo.

Q: I am currently renovating the interior of my home in Beaverton, which I purchased about three years ago. Over the next two years, I plan to devote my time and attention to landscaping. My 1/3 acre lot is a corner lot on a steep hill facing northeast, near the base of Cooper Mountain. It has six long stone terraces which cover much of the property unoccupied by the house and driveway.

Much of the shrubs that were planted many years ago are old and diseased, and many species are not native to Oregon. By replacing the plants on these terraces, I want to favor the planting of species that:

  1. Provide food and habitat for birds, bees and butterflies
  2. Do not require watering after establishment
  3. Have an attractive appearance.

How can I find someone who can help me design landscaping with an emphasis on beauty, as well as food and habitat for birds and pollinators. – Washington County

A: I will give you links to some publications to read on planting for pollinators and birds. This will give you a solid foundation of understanding when talking to landscaping companies.

You will simply need to contact different landscaping companies, explain what you want, and see if they provide these services.

The Xerces company has a great guide, “Pollinating Plants: Northwest Maritimes Region » which is a great starting point. They suggest trees, shrubs and flowers. Here are the OSU extension releases, “The Wildlife Garden: Creating a Butterfly Garden”. Not only does this provide a list of plants, but also other aspects of its overall landscaping practices to meet the needs of various butterflies.

Also from OSU Extension publications, is “Improving urban and peri-urban landscapes to protect pollinators”. After reading this comprehensive publication, you could take on the project yourself.

Note that after the post description, there is a link to a 10-week online course on growing and caring for perennials. Below are additional files of pollinator garden designs. Have a fun winter reading, dreaming and planning. – Anna Ashby, OSU Expansion Master Gardener