Damage, disease and pests.

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Andyh
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Damage, disease and pests.

Post by Andyh » Mon Feb 20, 2017 2:14 pm

Hi all,
This Cereus peruvianus had some slug damage in the autumn. There are now black and rust color marks. I'm guessing fungus? Most stems have some. Is it recoverable do you think?

The second picture is an Opuntia from the cold greenhouse. Two pads had some rot which I cut off. This pad only has a little. Should I cut it off? Its now in the house.

Finally a picture of moth damage for interest. The caterpillars like aeonium shoots as well as pelargoniums.

Any tips welcome. I'm avoiding using pesticide unless on indoor plants.
Andy
20170220_133931.jpg
Problem with Cereus
IMG_20170220_135630.jpg
Opuntia rot
20170220_134017.jpg
Aeonium with caterpillar damage
Last edited by Tony R on Mon Feb 20, 2017 2:38 pm, edited 2 times in total.
Reason: Reordered pictures correctly by placing images inline - looks neater. recommended to you in future. thanks.
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Liz M
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Re: Damage, disease and pests.

Post by Liz M » Mon Feb 20, 2017 2:51 pm

I have had moth damage on my Aeoniums, too. A small green caterpillar 'sews' the leaves together to make a nest, which runis the leaves. The best control for this is to check frequently and remove the caterpillar. I have been having this problem for a couple of years now and fortunately Aeoniums grow fast in summer and the damage grows out. I have come across the same on Pelargoniums, I cut off all the leaves back in late Autumn and hope the problem does not re-occur. There has been a lot of this across the country, I don't use any controls just regular checks.
I can't help you with your Cereus or Opuntia, as I have been fortunate with those.
Obsessive Crassulaceae lover, especially Aeoniums but also grow, Aloes, Agaves, Haworthias and a select number of Cacti.
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rodsmith
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Re: Damage, disease and pests.

Post by rodsmith » Mon Feb 20, 2017 2:54 pm

The black markings on the cereus look like cold damage. This plant doesn't like the cold in my experience and I would recommend you maintain it in a temperature of around 10 deg C. With the opuntia I think I would detach the smallish offshoot at the top (partly out of the picture) and root it once it has calloused over. The rest of the plant might not be salvageable.
Rod Smith

Growing a mixed collection of cacti & other succulents; mainly smaller species with a current emphasis on lithops & conophytum.
Andyh
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Re: Damage, disease and pests.

Post by Andyh » Mon Feb 20, 2017 3:43 pm

Thankyou Liz and Rod.
As you say the caterpillar pulls the leaves together damaging the growing point for a while. They also damage Easter/Christmas cacti. The first sign of trouble is tiny seed like frass around the pots. If I spot this I look for the the caterpillars. Often I don't notice until they've caused damage.
The greenhouse has dropped to 5 degrees quite a few times. Most plants are fine, but as you suggest the cereus wants it warmer. Next winter I might use a bit more insulation. Pilocereus also suffered from small slugs and similar markings. Andy
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Acid John
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Re: Damage, disease and pests.

Post by Acid John » Mon Feb 20, 2017 9:43 pm

I had the same moth it turned out to be tortrex.
Acid John
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MikeT
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Re: Damage, disease and pests.

Post by MikeT » Tue Feb 21, 2017 2:57 pm

The various tortrix moth caterpillars have this behaviour of sticking leaves together, using the plant they're eating as a protective cover. I've had Aeoniums and Echeverias in the greenhouse damaged this way; roses and all sorts attacked in the garden.
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