Mathews Inc.
Buckthorn spring spraying
Wisconsin
Contributors to this thread:
Jeff in MN 08-May-19
Treefarm 08-May-19
Jeff in MN 08-May-19
Jeff in MN 08-May-19
Treefarm 09-May-19
Treefarm 11-May-19
Jeff in MN 12-May-19
Jeff in MN 12-May-19
Treefarm 12-May-19
Treefarm 14-May-19
From: Jeff in MN
08-May-19
I checked a patch of small buckthorn yesterday and it is leafed out almost enough to spray the foliage. Gonna rain today but tomorrow they should be ready. So if you were thinking about doing that this is the time, at least at my latitude in Minnesota which is roughly Tomah/Oshkosh.

From: Treefarm
08-May-19
For those who spray buckthorn via foliar spraying in spring, be careful that non-target plants are not present or emerged.

An alternative if non-target species are present is to spray during an approximate two week window starting about October 20 each year. Look for conditions where the forest floor is dormant, native trees are leafless or dormant, but buckthorn leaves remain succulent. The period lasts approximately two weeks provided hard freezes are limited, so timing is critical.

Water-base mixes containing herbicides incorporating Triclopyr or Glyphosate can be used. Additional caution when using Glyphosate is avoid when grasses are present as they have late dormancy.

Yes, it occurs during fall hunting.

From: Jeff in MN
08-May-19
Treefarm, the patch I am thinking of doing foliar on is only about 30x15 yards and it is so thick that there is virtually nothing under it. But the BT has also grown a lot since last year so I think I will do basil treatment on in anyway. I will miss a lot of it just because it is so thick, will need to do a second and probably even a third pass on it anyway. The email you sent me made it sound like I should wait a while to get an effective kill with base treatment. Did I understand that correctly.

From: Jeff in MN
08-May-19
Oops, double post

From: Treefarm
09-May-19
In the situation you describe, it falls under the situation of “no non-target” plants being present. It is all about risk vs. gain. If buckthorn remains, nothing grows anyway, even if some desirables are present. That’s when I spray.

Basal treatment can work in springtime but not 100% effective. The reason is because of plant vigor. All that stored energy in roots helps power the spring flush.

So, in a pinch, spring basal application can work but always best during dormancy.

Cut stump application is always to be avoided in spring as herbicide washes away.

From: Treefarm
11-May-19
Today was the day to walk, scout, and carry paraffin-base oil mixed with Triclopyr ester. My main target was Elderberry, which I scored well. Also found occasional buckthorn seeding, Ribes sp., and Box elder. I thought I would find a shed, but no luck. The understory is looking good.

From: Jeff in MN
12-May-19
I spent about 3 hours each of the last 3 days treating a patch of small stuff, mostly under a foot tall but some up to 4' with a couple of 8 footers mixed in. Most of the small stuff is confined to about an acre surrounding one of my deer stands. I hope to finish today. The whole woods is only about 4 acres. I should be able to finish it today.

I am trying to mix in a permanent colorant to the mixture. (so I can really see if any of what I treated survived, the dye made for this is made to break down in sunlight in a few days so that doesn't help much) But the paint colorant I am using is not mixing well with the diesel fuel, it floats on top of the diesel. I tried to thin the dye with Xylene first, not much luck. I added some MSO and that helped but still not great. But as the tank goes near empty I do get a brilliant blue coming out of the sprayer.

On the bright side, the buckthorn is nearly the only thing with any foliage so it is easy to spot them.

From: Jeff in MN
12-May-19
Treefarm, so now that leaf flush is over for buckthorn does that mean that basil treatment can be used the rest of 2019? (I know that October through at least January is good.

Also, does anyone know of a good dye that does NOT fade away and can be used in the diesel/triclopyr mixture doing basil application? All the ones I have seen or tried fade away in a week or less. I would like to be able to tell how effective my work is. i.e. when I find a live one in an area I treated I would like to know if I just missed it or if the treatment failed.

From: Treefarm
12-May-19
Full leaf development is a ways off yet so energy from photosynthesis is not quite there. Basal treatment can be used year round ( no frilling or cutting). Basal treatment is best during dormancy however. An alternative this time of year is using cheap vegetable oil and Triclopyr so when you see a thick patch you can flip to foliar/stem spraying and not worry about contaminating soil with diesel with overspray.

From: Treefarm
14-May-19

Treefarm's Link
Here is an article to review on dye factors.

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