My little cactus in flower


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  • 8 years later...

Hi at all,
I have a problem with my plant, this year it has this discoloration on two sectors and it seems to be fading,

any idea on the type of problem? remedies?

Many thank's

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Sorry to see your cactus problem, it was such a nice plant 8 years ago.  I can't identify the exact problem but would ask if it had any big changes in how it has been kept recently, such as extreme sunlight, extreme cold, or changes to the watering regime?  Has it been turned so that the "dark" side now faces South (towards the sun)?

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13 hours ago, Gaz said:

Sorry to see your cactus problem, it was such a nice plant 8 years ago.  I can't identify the exact problem but would ask if it had any big changes in how it has been kept recently, such as extreme sunlight, extreme cold, or changes to the watering regime?  Has it been turned so that the "dark" side now faces South (towards the sun)?

Hi Gary,
the plant apart from the transfer that I had done in winter, I always kept it in the same place with the same care, the only thing that makes me doubt is that most likely I turned it on itself, so as you say ..... I hope only the lesser evil, a sunburn rather than an infection

Many thank's for your reply

Regards

Natale

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Hi Natale, yes let's hope it's "just" a sunburn, unsightly but not fatal.   Hope to see it again next year when in flower.

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Transfer? What does that means? Same as repot or as in move of location? Sorry about my bad English.

In winter cactuses is best kept cold and bone dry. Yelowing  or whitening is often signs of spider mites. Ongoing infection or former infection.

Be

Magnus 

    

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Hi at all,
every opinion is welcome, we are in a forum and we are here to help us with our experiences, thank you all for this.
Today I noticed some worsening, I think it really is an infection, if so please suggest me how to proceed, here are some photos unfortunately taken with the smartphone that accentuates the colors a little, note the orange spots.
Waiting for opinions and solutions, thank you all.

Regards

Natale

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Edited by Natale
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Spider mites are indeed redish in colour.

If you are in the northern hemisphere the cactus should be in dormancy kept too cold for the spider mites to be active.

How do you keep the cactus? Environment and care?

Br

Magnus     

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Hi Magnus,

I am in southern Italy, here the temperatures even in winter are very mild, the cactus was born and raised here, I have always kept it exposed to the south and always outside, no particular care, water every week sometimes with fertilizer, more often in spring and summer, nothing more.

Could I do a treatment with some specific product?

Edited by Natale
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What I do when i get spider mites is to get some predatory mites Phytoseiulus Persimilis to battle it. Very effecient but expensive. For one plant it might be a little too expensive, depending on how much you value your cactus.

 

There might be some systemic treatment (poison) that can treat it. But I am very concerned to keep all my produce organic, so have no experience there.

The first thing you need is to make sure it is spider mites so you dond treat it wrong. Try to identify by using loupe or microscope. Look for the netting and look for the red dots, if they are mowing and campare to pictures online.

Br

Magnus   

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The affected area looks a bit too localised for spider mites from my experience, is it really just 2 ribs or is that just how the photo was taken?  Are the orange spots part of the surface or are they on the surface, i mean is it easily wiped off? I've used diatomaceous earth powder for mites in the past but it does get messy. Have you had a good look with a magnifying glass? Could orange spot be fungal? 

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Hi Gary,

The problem is only on two ribs of the plant, only on one side, the part is smooth discolored to the touch, this morning I tried to clean the orange stains with a little alcohol but they don't come off

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hi Natale,

from what I've read on cactus forum could be mineral deficiency (maybe iron or manganese), possibly caused by incorrect ph of compost.  Have you changed the type of fertiliser used this year?  Do you use low nitrogen fertiliser?  How long since the plant was last repotted?   Out of interest how does the grow point look, still healthy?

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Hi Gary,

I repotted the plant in early spring, I put a base of expanded clay on the bottom, the soil a mixture of acid peat of sphagnum and universal soil mixed with expanded clay, I do not use a specific fertilizer for cacti but the generic one (ox blood or other), the plant again this year has bloomed a lot and has become taller like every year. This year I noticed a lot of ants on them that I got rid of.

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Sounds like a reaction to a much heavier soil. For now there are not much growing going on before spring. I would keep it as dry as possible until spring.

In much of europe the fall har been much wetter than normal. Is that the case where you are as well? 

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I'd agree with Tropfrog's comments and also perhaps the oxblood is too rich in nitrogen.  Maybe next year you could find a low nitrogen fertiliser but for now it should be kept dry, and cool until March or April.   Good luck, hope to see it in good health next year.

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Hi at all,

Here it is not very humid, then I'm lucky because I have a single balcony completely south.
I will use the fertilizer (ox blood) on other plants, it is a shame to throw it away, while the cactus I will leave it dry, it will feed only on the typical humidity of the winter of the house.
Thanks a lot for your reply.

Best Regards

Natale

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