Caterpillars killed my bush. What now?

Caterpillars killed my bush. What now?

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MDifficult

Original Poster:

2,050 posts

185 months

Tuesday 7th September 2021
quotequote all
Hi all,

As will become apparent, I’m not a gardener. I have a lovely garden and I look after it with two tools: A petrol mower and a petrol hedge trimmer. Once a pistonhead, always a pistonhead.

However, I’m now out of my depth. One of my nice cubic bushes has been killed by a zillion Japanese caterpillars (apparently).

Here it is now, in all its glory. It went from ‘nice’ to ‘horror show’ in about a month. bds.



Clearly, this is not coming back to life.
And clearly, replacing with something similar probably not a good idea.

I think I need to cut it all down, throw it all away, then dig out the stump/roots etc. Is this right?

Then I need replace it with something that won’t get eaten by bds but will fill a 1m cubed space and is easy to look after and thick so you can’t see through it. Any suggestions?

I’d like something mature so I don’t have to wait for it to grow and I’d like to have it delivered because my cars are too nice. Any recommendations for where to buy from online?

If it helps, the space is sometimes shady and sometimes sunny and the soil is mainly brown and dirty.

All help gratefully received! Thank you thumbup

Pheo

3,341 posts

202 months

Tuesday 7th September 2021
quotequote all
Presumably it was a box plant, if so it'll be Box Plant Caterpillar.

Yes, dig it all up, burn it. Likely others in your garden if you have any may cop it. There are some controls possibly coming onto the market, but not much.

I would dig it up and burn it to reduce the chance of spread.

RHS Wisley is trialing alternatives - Try their website for something similar.

MDifficult

Original Poster:

2,050 posts

185 months

Tuesday 7th September 2021
quotequote all
Pheo said:
Presumably it was a box plant, if so it'll be Box Plant Caterpillar.

Yes, dig it all up, burn it. Likely others in your garden if you have any may cop it. There are some controls possibly coming onto the market, but not much.

I would dig it up and burn it to reduce the chance of spread.

RHS Wisley is trialing alternatives - Try their website for something similar.
Thank you! Yes - a box plant murdered by those wriggly black & green bds.

Do I need to get the stump/roots out? Or can I just plant something in the same place after I chop off and burn all the stuff above ground?

I had a quick look at the RHS Wisely trial (after a quick Google) and, if I’m honest, it’s all a little over my head and too much choice.

Ideally I’m hoping for a suggestion like… “Buy a doodah mate, it looks like box and won’t die from caterpillars, grows anywhere, hard to kill and you can get one delivered from doodahsonline.com for not too much money”

wink



PhilboSE

4,365 posts

226 months

Tuesday 7th September 2021
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Ilex crenata is the most commonly used box replacement at the moment that can be treated mostly like for like. You’ll struggle to find a 1m3 example ready grown though.

I also saw some bamboo trimmed in a similar way at the Hannah Peshar sculpture garden last week which looked surprisingly good.

sleepezy

1,802 posts

234 months

Tuesday 7th September 2021
quotequote all
Lovely little blighters aren't they

We have quite a bit of box and use Xentari to pretty good effect in keeping them at bay. Tend to spray everything 3 times a year and again if we see the impact of an infection.

One thing - the plant may be able to recover really well from an infection - but you need to ensure your new friends don't stay around or spread - or you may decide it's too much hassle and get rid, a view I could sympathise with. At least they're very particular over their diet so nothing else is really at risk.

doogle83

760 posts

147 months

Tuesday 7th September 2021
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The little bds have got 2 at my place and 6 at my mum's this year as well. censored

MDifficult

Original Poster:

2,050 posts

185 months

Tuesday 7th September 2021
quotequote all
doogle83 said:
The little bds have got 2 at my place and 6 at my mum's this year as well. censored
Glad it’s my only box bush - imagine if I had my own maze laugh . But yes, bloody annoying!

sleepezy said:
Lovely little blighters aren't they

We have quite a bit of box and use Xentari to pretty good effect in keeping them at bay. Tend to spray everything 3 times a year and again if we see the impact of an infection.

One thing - the plant may be able to recover really well from an infection - but you need to ensure your new friends don't stay around or spread - or you may decide it's too much hassle and get rid, a view I could sympathise with. At least they're very particular over their diet so nothing else is really at risk.
I was just amazed by how quickly they destroyed it. At first I looked and couldn’t see what was doing it… then I realised that that the whole bush was basically made of caterpillars. In its last days, if you listened carefully, you could hear the whole bush making a chomping noise!

PhilboSE said:
Ilex crenata is the most commonly used box replacement at the moment that can be treated mostly like for like. You’ll struggle to find a 1m3 example ready grown though. Thanks

I also saw some bamboo trimmed in a similar way at the Hannah Peshar sculpture garden last week which looked surprisingly good.
Ilex Crenata! Brilliant, thank you, I’ll take a look. Thank you!

FourWheelDrift

88,539 posts

284 months

Tuesday 7th September 2021
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I can lend you my dog, he has the uncanny ability to find every Elephant hawk moth caterpillar in the garden so far this year.

MDifficult

Original Poster:

2,050 posts

185 months

Tuesday 7th September 2021
quotequote all
FourWheelDrift said:
I can lend you my dog, he has the uncanny ability to find every Elephant hawk moth caterpillar in the garden so far this year.
Very kind offer, but the giant cube of dead sticks and cobwebs suggests I’m much, much too late laugh

Johnnytheboy

24,498 posts

186 months

Tuesday 7th September 2021
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Sarcococca as a replacement.

Nice smell in mid winter, prune after flowering in early spring. Looks a bit like box.

MDifficult

Original Poster:

2,050 posts

185 months

Tuesday 7th September 2021
quotequote all
Johnnytheboy said:
Sarcococca as a replacement.

Nice smell in mid winter, prune after flowering in early spring. Looks a bit like box.
Thanks very much - I’ll take a look.

One thing I’ve learned over the last couple of hours is that it appears that rather than a small, annoying inconvenience of a dead bush - replacing this bush with something of a similar size is going to cost me a f@cking fortune!

I’ve gone from being a little ticked-off to really annoyed! Who knew big plants were so flipping expensive!?

Johnnytheboy

24,498 posts

186 months

Tuesday 7th September 2021
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Buy small, cost of plants is based on how long it takes to grow them.

Cost goes up geometrically with size.

Pit Pony

8,589 posts

121 months

Tuesday 7th September 2021
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What now? Butterflys.

MDifficult

Original Poster:

2,050 posts

185 months

Tuesday 7th September 2021
quotequote all
Johnnytheboy said:
Buy small, cost of plants is based on how long it takes to grow them.

Cost goes up geometrically with size.
This I am learning. By my calculations my dead bush was probably worth £500 when it was alive!

MDifficult

Original Poster:

2,050 posts

185 months

Tuesday 7th September 2021
quotequote all
Pit Pony said:
What now? Butterflys.
Nope.

I actually consoled myself a little with the thought that at least my personal bush tragedy was bringing thousands of lovely butterflies into existence.

But no. Turns out these black/green bds turn into the butterfly’s evil twin…. F@cking moths!!

rxe

6,700 posts

103 months

Wednesday 8th September 2021
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For future reference, drenching it in a can of fly killer works well….

AC43

11,488 posts

208 months

Wednesday 8th September 2021
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MDifficult said:
Johnnytheboy said:
Buy small, cost of plants is based on how long it takes to grow them.

Cost goes up geometrically with size.
This I am learning. By my calculations my dead bush was probably worth £500 when it was alive!
If you're near Denham you can swing by Tendercare and see what they've got - I've bought a lot of large-ish shrubs from there and some small to medium trees.

There are several other nurseries in the same area, I just happen to have used Tendercare and can recommend them.

If nothing else you'll get some good advice.

AC43

11,488 posts

208 months

Wednesday 8th September 2021
quotequote all
sleepezy said:
Lovely little blighters aren't they

We have quite a bit of box and use Xentari to pretty good effect in keeping them at bay. Tend to spray everything 3 times a year and again if we see the impact of an infection.

One thing - the plant may be able to recover really well from an infection - but you need to ensure your new friends don't stay around or spread - or you may decide it's too much hassle and get rid, a view I could sympathise with. At least they're very particular over their diet so nothing else is really at risk.
Another vote for Xen Tari. I first experienced the box moths in a rental 4 years ago. I was keeping a lot of pots in the garden with various plants in including a number of boxes. By the time I figured out what was going on, one was finished and the rest were badly damaged. The latter have since recovered and are now planted in borders round my garden.

Spotted what looked like a new outbreak the other day and, right enough, loads of caterpillars and eggs. Nipped it in the bud with some heavy spraying.

https://www.amazon.co.uk/TOPBUXUS-XenTari-Professi...

Gren

1,950 posts

252 months

Wednesday 8th September 2021
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We cleared out 20m of box hedge over the weekend. Buggers got the lot - front and back gardens. All in the 2 weeks we were away on holiday.

We've replaced one hedge with Yew and one with Euonymus 'Jean Hughes' which looks just like box but doesn't die.

Dr Mike Oxgreen

4,126 posts

165 months

Wednesday 8th September 2021
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Pheo said:
Presumably it was a box plant, if so it'll be Box Plant Caterpillar.

Yes, dig it all up, burn it. Likely others in your garden if you have any may cop it. There are some controls possibly coming onto the market, but not much.

I would dig it up and burn it to reduce the chance of spread.

RHS Wisley is trialing alternatives - Try their website for something similar.
What on Earth are you blithering on about?

Unfortunately the OP seems to be taking your advice to rip it out and burn it.

Why???

I think you’re getting confused with box blight, for which it definitely is necessary to rip it up and destroy.

But what we have here is not a disease, so there is no need to burn anything. And actually box is amazingly resilient, and I really think there’s a chance that plant might come back. It’s certainly worth giving it a chance before giving up on it, because any replacement will be eye-wateringly expensive at that size.

As others have said, XenTari is the answer. It is totally effective against box tree caterpillars. It’s available on Amazon. And the best thing is that it only affects things that eat the box plant, which is pretty much only box caterpillars. So it doesn’t harm anything else.

The OP should get XenTari, and buy one of those pump-up sprayers from a garden centre. Spray what’s left of this plant, and any other box plants. Then wait and see what this plant does, at least into next spring. With luck, it’ll come back strongly next year.

And then, the OP should spray box plants with XenTari routinely, maybe about every six weeks during the summer months.

OP: Please don’t just take the first bit of advice offered on this thread. As you’ve discovered, replacing your box will cost a fortune, and there’s a good chance it’s unnecessary. Your box isn’t dead, it’s just had all its leaves eaten off. It might well come back if you give it a chance. Of course if you decide you don’t want to wait and are willing to fork out for a replacement, then fair enough - but this isn’t your only option. And I say again: your box isn’t dead!



Edited by Dr Mike Oxgreen on Wednesday 8th September 09:41