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 Trichocereus problem

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PostSubject: Trichocereus problem   Mon Mar 17, 2014 2:54 pm

Hi sorry to hijack this thread but i recently have started a cactii collection; with 3 small trichocereus bridgesii.

These guys have similar white scale/scabs on the skin, not to the extent of those in the photo and no black ooze.

Is this normal to some extent are do I have the early signs of an infection appearing?
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SneakyCuttlefish
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PostSubject: Re: Trichocereus problem   Mon Mar 17, 2014 3:47 pm

We will need a pic to determine a cause. Can always start a new topic and link it to this one. Helps build the information network.

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Hellonasty
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PostSubject: Re: Trichocereus problem   Mon Mar 17, 2014 4:41 pm

I split the topic for you Smile post a picture for us?

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PostSubject: Re: Trichocereus problem   Mon Mar 17, 2014 6:21 pm

These are my Trichocereus Bridgesii, from left to right i've named them (weird thing to do?); Hea, Sierra and Link.



So I have tried to show the "white scabs" they are on all 3 to some extent, here are some close-ups.



As a novice would also like to hear some growers opinions on the base of these guys which in all 3 seems to have no colour and look a little off.




Not sure what has happened to the top of "HEA"


Please let me know any info I am trying to learn as much as possible, is this normal? Can I help?

Thanks a lot!
 cat  alien  sunny  flower  study  pirat  cyclops  
PI
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PostSubject: Re: Trichocereus problem   Mon Mar 17, 2014 6:39 pm

Yeah that's pretty normal scarring on tricho's. Sometimes caused by sucking insects sometimes by fungi. Bit hard to be sure most of the time as they just appear out of no where. In the bottom picture there are some mottled green spots. This sometimes results in ooze of doom but only under certain conditions.

I have pondered the possibility of a virus doing this but there is limited information at best and the evidence is to hard to collect in the backyard.

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PostSubject: Re: Trichocereus problem   Mon Mar 17, 2014 6:50 pm

Thanks SCF, should i try and scratch off or do anything?
Do the bases of the cactii look ok?
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PostSubject: Re: Trichocereus problem   Mon Mar 17, 2014 7:54 pm

Your problems are all being caused by brown scale. Have a close look at the third picture, you can see the immature scale all the way up to larger more mature scale. The scale are sucking insects and move extremely slowly, they damage the skin, making the plant weak, and hence cause bacterial problems.

Regular scarring will usually be grey in colour, whilst the scale are, in this case, brown.  You can scrape them off with a sharp plastic knife or scraper, turn one over and have a good look at it.

Treatment for brown scale is difficult because  they are very hard to dislodge and the hard outer shell prevents insecticides penetrating them.

I will write a little bit on treatment later, I'm a touch busy Smile

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PostSubject: Re: Trichocereus problem   Mon Mar 17, 2014 10:35 pm

Hey thanks a lot HN, I have a good clay sculpting tool that may help to remove the scales.
Any more advice would be great to hear but I will certainly be reading up a lot more on Brown scale.

Cheers!

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PostSubject: Re: Trichocereus problem   Mon Mar 17, 2014 10:47 pm

hmmm scale. never thought of that. It would make sense that a pre-existing condition such as this could lead to the infection that causes the black ooze.

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PostSubject: Re: Trichocereus problem   Tue Mar 18, 2014 11:21 am

Yep you have picked up the right idea from my post Sneaky. One problem causes a flow on effect and makes a small issue a big one.

I'm thinking if you control the scale and give them a good feed they will really pick up. The only slight issue I see is in the last photo, that discolouration on the right column may be caused by a different problem but let's treat the scale first.

Brown scale treatment;

Make a mixture of white oil, a systemic insecticide and water. Completely drench the plant. Repeat in 8 days. WARNING; Cacti will only tolerate a certain amount of oil on the skin, do NOT use to much oil, cacti need to "breath" through the skin if the oil is too thick your plant will suffocate.

Now give your plants a feed with a liquid fert, any will do.

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PostSubject: Re: Trichocereus problem   Tue Mar 18, 2014 5:18 pm

Thanks HN. I am going to give this a go this weekend.

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PostSubject: Re: Trichocereus problem   Tue Mar 18, 2014 6:39 pm

Thanks a lot, is it beneficial to try and remove the scabs/scales with a scalpel?
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PostSubject: Re: Trichocereus problem   Wed Mar 19, 2014 9:50 am

Yep spray first, let it dry and then you can remove any scale that you can by hand.

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PostSubject: Re: Trichocereus problem   Wed Mar 19, 2014 5:08 pm

Hi everyone,

I rode to bunnings this morning and picked up some EcoPest Oil and some Powerfeed.
The saleperson told me to apply the Oil later in the evening because it is a pretty hot day.

So I get home, moved them to a shaded area and eager to help my cactii I started to use my scalpel to remove the brown scale. These bugs are strange like thorns in reverse. I got most of them out leaving some moderate craters in my bridgesii.

However like you mentioned nasty, the smaller plant I named Hea looks a bit sick and it had really no brown scale compared to the other two. The base is very soft and looks squishy. It seems to have a new stem shooting off, but if I can continue to hound you for information, what is going on here?

Time for a re-pot?

PS: I plan to give all 3 a spray tonight with watered down oil, and powerfeed.
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PostSubject: Re: Trichocereus problem   Wed Mar 19, 2014 9:57 pm

Just be careful spraying after you have removed the scale! The scale would have damaged the skin and when you remove them you cause some damage too. Spraying exposed/damaged skin can cause bacterial issues.

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PostSubject: Re: Trichocereus problem   Wed Mar 19, 2014 11:11 pm

uh oh, how do the bacterial issues appear, i'll keep an eye out.

Any ideasl what the problem of discolouration in the smaller one might be a result of?
It seems squishy and could potentially black ooze?
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PostSubject: Re: Trichocereus problem   Thu Mar 20, 2014 6:14 pm

Bacterial issues will appear as orange "rust" or black soft patches. I wouldn't worry too much trichos are tough buggers.

Just keep an eye on the other issue, I think it will resolve itself once you fix the scale and give them a feed. It is most probably a nutrient deficiency.

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PostSubject: Re: Trichocereus problem   Thu Mar 20, 2014 6:32 pm

Awesome, thanks a lot for your help, i've got them in the shade for the next week or so I think,
They look pretty good today.

Cheers! Thanks a lot
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