Australian Cacti Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.



 
HomeGalleryLatest imagesRegisterLog in
Latest topics
» How to treat scale pests on a cactus without removing the blue wax coating?
2 Problems: Sun? Rust? and "a big chunk eate" Emptyby gwhite24 Thu Oct 27, 2022 6:24 pm

» Cacti Identification help.
2 Problems: Sun? Rust? and "a big chunk eate" Emptyby Eck Fri Oct 29, 2021 9:56 pm

» NSW public campaign on Prickly Pear including Bunny Ears
2 Problems: Sun? Rust? and "a big chunk eate" Emptyby Eck Thu Oct 07, 2021 3:03 pm

» Copiapoa ID ?
2 Problems: Sun? Rust? and "a big chunk eate" Emptyby region4 Thu Oct 07, 2021 12:29 pm

» Cactus accident
2 Problems: Sun? Rust? and "a big chunk eate" Emptyby Eck Tue Jun 22, 2021 6:24 pm

» Anyone still browsing this forum?
2 Problems: Sun? Rust? and "a big chunk eate" Emptyby SlightlyHooked Sun Jun 20, 2021 9:43 pm

Gallery
2 Problems: Sun? Rust? and "a big chunk eate" Empty

 

 2 Problems: Sun? Rust? and "a big chunk eate"

Go down 
3 posters
AuthorMessage
Sternkaktus

Sternkaktus


Number of posts : 31
Location : Far North QLD
Registration date : 2015-03-26

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptySun Oct 25, 2015 11:37 am

Hello everyone. I've got 2 problems.

Problem A)
Over night something has chewed a considerable chunk out of one of my cacti.
I found a picture on the internet where a slug had done similar damage but mine are kept indoors.  So, no slugs here.
Any idea?

Problem B)
The reddish hard areas.
It appeared on one cactus shortly after I bought it and it is a nudum so I though this would probably be just sun-damage.
So I gave him a bit of shade.
The affected area did get bigger but and now I see dots on some of the other cacti that stood close to it.
I am quite concerned about that one now.
Any idea?

I tried to upload 3 pictures but got the message:
Uploaded file is not valid: exceeded attachment maxsize (0 kB).
Help admin :-)
Back to top Go down
SneakyCuttlefish
Moderator
SneakyCuttlefish


Number of posts : 705
Location : FNQ
Registration date : 2012-12-11

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptyMon Oct 26, 2015 7:54 am

Hi SternKaktus.

Pictures need to be no bigger than 800 x 800 pixels. Normally camera photo's are enormous. You will have to re-size them before uploading.

I have had issues in the past with caterpillars and mice eating cacti. I also once had a nasty big native cockroach come into my garage and eat a few fresh seedlings under a light. Could any of these be a possibility?
Back to top Go down
Sternkaktus

Sternkaktus


Number of posts : 31
Location : Far North QLD
Registration date : 2015-03-26

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptyMon Oct 26, 2015 1:56 pm

I got it.  Thank you SneakyCuttlefish!

2 Problems: Sun? Rust? and "a big chunk eate" Damage15
The chewed off bit & some spots too.

2 Problems: Sun? Rust? and "a big chunk eate" Damage16
The damage I thought to be sun damage but seems to be spreading.

2 Problems: Sun? Rust? and "a big chunk eate" Damage14
Fungus?


Yes, roaches is possible.  I am in far north QLD so Roaches are sort of unbeatable.  That would be really bad.  It would probably not be able to keep the cacti save.  Maybe I could spray the cacti regularly with an insecticide?
This damage won't grow back I assume?

Any idea about the reddish brown patches?

Thanks!
Back to top Go down
Q-cactus

Q-cactus


Number of posts : 6
Location : North Brisbane
Registration date : 2015-07-22

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptyMon Oct 26, 2015 3:42 pm

Yes to the roaches and crickets. I had 200 copiapoa cinerascens seedlings. Every single one was nibbled, as your photo shows. Small holes, but deep.
I have used crown 225SL, aternating with Rogor to fix the issue.
The rust is a epidermal fungal infection. It will spread if not treated. The Myriostigma may survive, but it won't be pretty.
I have had the same disease here north of Brisbane. In my case it was caused by plants being left outside during a cold wet winter. All the damage was on the southern face of the plant, away from the sun.
Back to top Go down
SneakyCuttlefish
Moderator
SneakyCuttlefish


Number of posts : 705
Location : FNQ
Registration date : 2012-12-11

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptyMon Oct 26, 2015 8:23 pm

Very interesting Q-cactus. I have noticed this on plants in others collections from time to time. How do you recommend treating it as friend is currently battling a severe out break on his astro's?

Sternkaktus, the chew marks will eventually grow out. It will take time and look a bit sad for a while but considering the astro is young, one could expect the damage to tuck under it before the cactus reaches the age where it will want to elongate.
Back to top Go down
Sternkaktus

Sternkaktus


Number of posts : 31
Location : Far North QLD
Registration date : 2015-03-26

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptyWed Oct 28, 2015 11:33 am

Thank you Q-cactus & SneakyCuttlefish!

Problem A
I'll look into those insecticides. Meanwhile I have purchase some new cockroach bait.
The Myriostigma are around 6cm across (still young enough?) and the hole is the size of a pea.

Problem B
I bought a fungicide called Mancozeb Plus.
I wonder how long and how often I will have to use this now. Also, do I need to treat cacti that show no symptoms too? It leaves brownish/grey stains on the cacti :-( which looks particularly ugly on the astros with lots of white.
Back to top Go down
SneakyCuttlefish
Moderator
SneakyCuttlefish


Number of posts : 705
Location : FNQ
Registration date : 2012-12-11

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptyWed Oct 28, 2015 10:01 pm

I have found fungal infections to be very tricky to treat. Sadly there is almost no official literature on the subject and any that is readily available is, in most cases, just hear-say. Fungal infections are hard to treat because the kind of fungus, mode of infection and severity of infection can vary so widely that any individual chemical may or may not work.

I deal with these issues through 2 methods. The first is to just bin the source of infection.

Second is to science it. Start treating it and record the dosage and chemical used. Then just keep uping the dose or try other chems or combinations. But be sure to record your efforts because you may need to repeat the process for other plants.

Sorry I can't be of more help but I have lost a lot of cacti to fungal infections that seasonally spring up then disappear without a trace. Most of which I have never been able to identify or treat.
Back to top Go down
Q-cactus

Q-cactus


Number of posts : 6
Location : North Brisbane
Registration date : 2015-07-22

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptySat Oct 31, 2015 1:22 am

HI Sternkactus. the problem with treating funus infection, is targeting the right chemical to the attacking fungus. Many fungal treatments target a specific fungal type or group, and there are simply hundreds to potentially deal with. So as Sneaky cuttlefish stated, you will need to experiment a little to find what works.
Mancozeb is a good broard spectrum treatment, but I found poor results on this particular rust fungus. I also tried fongarid, which is a systemic funguside .
This appeared to stop the spread on infected plants.
But as it turned out, the best remedy of all was simple, to house plants better, with more light, less exposure to damp and better ventilation. And don't all succulent growers agree with that!!!
I have not seen another attack this year as a result.
Q-cactus
Back to top Go down
Sternkaktus

Sternkaktus


Number of posts : 31
Location : Far North QLD
Registration date : 2015-03-26

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptyFri Jun 03, 2016 1:55 pm

Update on my little nudum Astrophytum myriostigma:

It's been 7 months now.  Although I was not too hopeful, I could not get myself to bin him.  I kept him in single confinement and regularly sprayed Mancozeb plus Sulphur all over him (2.5g/500ml).  I did that for quite a long time but saw no changes to the affected area (not increasing, not decreasing) but he seemed to be growing and fine besides that.
Today I picked him up determined to cut the affected area out.  When carefully scraping from the side I was however able to sort of peel dead epidermis off with healthy looking tissue underneath.
And yes, comparing the pictures I can see that he has grown too.
Happy    sunny

2 Problems: Sun? Rust? and "a big chunk eate" Fungus12
2 Problems: Sun? Rust? and "a big chunk eate" Fungus10
2 Problems: Sun? Rust? and "a big chunk eate" Fungus11
Back to top Go down
SneakyCuttlefish
Moderator
SneakyCuttlefish


Number of posts : 705
Location : FNQ
Registration date : 2012-12-11

2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" EmptySat Jun 04, 2016 5:03 pm

That's good to hear. You will find that this scaring will grow out in a season or two and hopefully you will have a perfect astro again.
Back to top Go down
Sponsored content





2 Problems: Sun? Rust? and "a big chunk eate" Empty
PostSubject: Re: 2 Problems: Sun? Rust? and "a big chunk eate"   2 Problems: Sun? Rust? and "a big chunk eate" Empty

Back to top Go down
 
2 Problems: Sun? Rust? and "a big chunk eate"
Back to top 
Page 1 of 1
 Similar topics
-
» Orange rot/rust beginning on the skin. WARNING: Some viewers may find distressing
» Do you have problems with birds?
» Problems with my penises. Echinopsis lageniformis monstrose that is.

Permissions in this forum:You cannot reply to topics in this forum
Australian Cacti Forum :: - :: Pests & Diseases: ID, Control & Prevention-
Jump to: