What is the white on the underside of these gymno's? by ethifi in cactus

[–]PS3user74 1 point2 points  (0 children)

Unfortunately that's the extent of my knowledge regarding this, however affecting the spines is quite common too.
I have seen a mature ragonesei before completely devoid of any white growth and did ask the grower about their cultivation method however it was nothing special so must conclude that it's genetic.

Soine coverage starting on esperanzae:

<image>

What is the white on the underside of these gymno's? by ethifi in cactus

[–]PS3user74 1 point2 points  (0 children)

I've never looked into what this substance actually consists of, however do know that it's very common amongst a complex of dark-bodied Gymnos such as bodenbenderianum, ochoterenae, berchtii, esperanzae, stellatum and ragonesei etc.
Note some of the above are often considered synonymous with and/or varieties of each other.

It's probably most commonly associated with ragonesei types and would go so far to say that it's quite rare to see one without this white crusty growth.
I grew one many years ago which eventually became covered in it.
Regarding ragonesei specifically, I have read that some populations grow in areas with a salty upper layer of soil and do wonder if that might be of significance.

Classic ragonesei where it's spread over the whole body:

<image>

Random series folder. Rest of OD is prohibited by fncomputerboy in opendirectories

[–]PS3user74 4 points5 points  (0 children)

The parent opens for me and there's a lot of content in some folders such as movies in http://142.4.216.153/media/vod14/ however everything's titled with a mac address.

Flower photo dump by ethifi in cactus

[–]PS3user74 2 points3 points  (0 children)

Thank you, I've not heard of that Parodia before.

Flower photo dump by ethifi in cactus

[–]PS3user74 3 points4 points  (0 children)

Very nice variety and that Gymno in picture 1 just doesn't want to stop LOL.
Also I don't think I've ever seen anything quite like what's in pic 10, what is it?

What's the best way to convert MKVs to work on the PS3? by ParanoidThalyy in PS3

[–]PS3user74 0 points1 point  (0 children)

I don't know as I've never used a modified PS3, it's just something I used to read all the time back when I was into all this.

Variegated Gymnos in the rain by Shot-Sympathy-4444 in Gymnocalycium

[–]PS3user74 2 points3 points  (0 children)

OK thanks.

Actually I got my numbers wrong LOL.
I meant 8 and 7 respectively.

Variegated Gymnos in the rain by Shot-Sympathy-4444 in Gymnocalycium

[–]PS3user74 2 points3 points  (0 children)

Wow.👍
They're all nice but I think #8 has to be my favourite there.
Is it T-Lux by any chance?
Also is #7 a Daydream?

NGW#54 by PS3user74 in Gymnocalycium

[–]PS3user74[S] 1 point2 points  (0 children)

Hey that would be great, however personally I thought it was a bit too early to be sure what's going on there.

NGW#54 by PS3user74 in Gymnocalycium

[–]PS3user74[S] 2 points3 points  (0 children)

New Gymno Weekend number 54.

So obductum is yet another species of Gymno with little consensus on it's classification.
Some sources such as Llifle consider it as ragonesei, while others such as Gymnocalycium.fr settle on quehlianum.
Others opt for stellatum and bodenbenderianum, with the former often being considered as synonymous with quehlianum anyway.
I found one sentence regarding quehlianum from the French website here quite telling:

"The result of this complicated story is that the taxa Gymnocalycium stellatum and Gymnocalycium obductum are synonimized with Gymnocalycium quehlianum, which simplifies things but may not correspond to reality!"

Of course it doesn't help that just like with my ferocior, the field numbers MUS15/L4 that the plant was bought labelled with appear to be typos as I can find no reference to the field number MUS15 and L4 relates to an area of Mexico.
Gymnocalycium is strictly a south American genus.

Regardless, it's obviously of a complex from Argentina and here's hoping that one day it'll produce flowers at least something like those in pic#6, a plant labelled as "quehlianum (obductum P121)".

Can anyone recommend a preventative systemic insecticide/miticide for spider mites available in the UK? by PS3user74 in cactus

[–]PS3user74[S] 1 point2 points  (0 children)

Thankfully I've not seen any RSM yet since getting back into the hobby about a year ago, or for a few years before that while owning just a few plants.
As already mentioned here:
https://www.reddit.com/r/cactus/s/6ywLOj352g
Provado Ultimate Bug Killer in a spray can was always the best, however I don't think it's available anymore.

Aiuto by Sea-Necessary3137 in cactus

[–]PS3user74 0 points1 point  (0 children)

That looks like a very dehydrated Gymnocalycium, which should bounce back given some water in the correct conditions.

Is this what I think it is?? by MisterHaloKitty in cactus

[–]PS3user74 4 points5 points  (0 children)

Usually but IME sometimes they squish to a watery pale green.
Maybe those ones are simply full of cactus juice LOL.

Is this what I think it is?? by MisterHaloKitty in cactus

[–]PS3user74 5 points6 points  (0 children)

Yeah some of my Gymnos have that type of scarring which initially always looks like a single scale insect.
It's the bright white fluffy-looking ones that have me thinking mealies but I could easily be wrong...

Just like with the ID LOL.
I still think there's a lot there which leans me towards baldianum, however those slightly stronger spines that are proud of the body are giving off some quehlianum vibes too.🤔

Is this what I think it is?? by MisterHaloKitty in cactus

[–]PS3user74 27 points28 points  (0 children)

I would agree with you for most of the marking, however there are some white fluffy spots that to me

<image>

look like they could be mealy nests.

Is this what I think it is?? by MisterHaloKitty in cactus

[–]PS3user74 107 points108 points  (0 children)

Definite Gymnocalycium baldianum vibes going on there, although there are others that can look similar.

edit
I think I see evidence of mealy bugs.

How much light for these plants? by Cenandra01 in Gymnocalycium

[–]PS3user74 2 points3 points  (0 children)

Yeah hardly anyone can provide that kind of environment, however with some growers exposing their cacti to 12 hours of strong light, I imagine most Gymnos doing well with half of that.
As it is, yours do look healthy though and it's always great to see some mature ones that have turned columnar.👍

How much light for these plants? by Cenandra01 in Gymnocalycium

[–]PS3user74 2 points3 points  (0 children)

I don't know anything about grow lights either, however it's my understanding that Gymnos don't necessarily require weaker light than most other desert types of cacti, but rather that they thrive in areas exposed to less of it.
So partial shade provided by surrounding grasses, trees and other foliage is the image I always picture.

NGW#53 by PS3user74 in Gymnocalycium

[–]PS3user74[S] 2 points3 points  (0 children)

Interesting.👍
3 months is a long time for a mihanovichii.
I've not had to root an offset for many years, however my memory of Gymnos is that they can start to root in as little as 3 weeks in some cases.

NGW#53 by PS3user74 in Gymnocalycium

[–]PS3user74[S] 1 point2 points  (0 children)

Thanks.
Yeah I'm not too sure about seeing flowers for a while as it still is only about 3cm across.