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Japanese honeysuckle, question about spray "timing"

5 years ago

I have read a few places to spray Japanese honeysuckle with glyphosate or triclopyr after the first frost but before the first 25°F night to minimize damage to surrounding vegetation. I think MO state published this info, and probably a few other state/govt agencies. My question is, if other plants in the vicinity are still green, like goldenrod, cool season grasses, and blackberry, is the spray going to work on those too, or are they basically shut down despite appearances?

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gardengal48 (PNW Z8/9)

5 years ago

I find that advise rather specious and certainly nothing that I have ever seen published. Both herbicides need to be applied to actively growing plants to be effective. And most deciduous but hardy plants have shut down growth for the season well before the first frost hits. So I doubt it/they will have a strong effect on anything deciduous or anything that wants to go winter dormant....including the honeysuckle.

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Skip1909
Original Author
5 years ago
https://mdc.mo.gov/trees-plants/problem-plant-control/invasive-plants/japanese-honeysuckle-control

https://cipwg.uconn.edu/japanese-honeysuckle/#

I think temps here will often fall to freezing at night and return all the way up into the 50's during the day where JHS can still photosynthesize. I noticed last year, in this timeframe a lot of other vegetation still looks green. If the others are basically dormant at that point I see no risk in trying this method.
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You may be stuck pulling the stuff up. Roundup is a systemic herbicide - the chemical is taken in through the leaves, and not as likely to be absorbed by a woody stem of a defoliated plant that is dormant. Something like Orthos brush-b-gone is more for woody plants, but in my experience the Ortho works better on honeysuckle than round-up. With the coralberry dormant it may be okay to use round-up as there are no leaves to absorb the chemical, however I am not familiar enough with coralberry to know how soft the stems are. Soft stems can absorb the chemical. I've got to believe, due to it's family, that they are fairly soft and new growth will stand a chance of absorbing poison. Not really worth the risk. Honeysuckle is not that bad to pull up, really, not in comparison to other invasives anyway. That's just my opinion, though, maybe because I've pulled up miles of the stuff in my life. It's still a chore and a half, probably take a couple of seasons, but coralberry is worth saving. I'm in my second season of battle with jh which has run over a bunch of natural ferns and unfortunately there is no easy way about it.
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kitasei
5 years ago
Why spray foliage rather than cut to the ground and apply the herbicide to the fresh stump? You are no doubt planning to remove it once dead anyway, aren’t you? Less labor and less spray.
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Skip1909
Original Author
5 years ago
Its an older stand that was here before I moved in, so we're not talking about a few vines running up a tree. There are hundreds of vines coming up all over the place like a sod. I spent around 8 hours this winter, cumulatively, working my way along the back property line pulling it by hand, and when I got to the other side it was just at another level, from the back of the property up to the street.

Here's the epicenter of the vines, pic taken right before I got after some of it with a brush cutter. Now I want to spray all the runners and ground level vines. Theres also poison ivy, virginia creeper, wild grapes and who knows what else in there.
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dandy_line (Z3b N Cent Mn)
5 years ago
Skip-I know this is a little late to be posting, but methinks the proper time would be early spring, when the natives are all abed yet and the non-natives are greening up. Whack them down with 2-4-d or whatever. There will be no collateral damage that way.
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Skip1909
Original Author
5 years ago
last modified: 5 years ago
I missed my late fall window anyway. At least now with the other vegetation going dormant the evergreen honeysuckle is sticking out like a sore thumb, the soil is wet, and its easy to pull. I hand pulled some of it the last couple weekends. I have all winter to get at the rest of it. Snow doesn't last long around here.
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