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Avocado roots turning black and white spots

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Anurag Churi starts with ...
Hello Experts,

I am using toothpick method to grow avocado tree from seed. Its a wild avocado i plucked from tree in africa and the growth has been good since from march 2018. I see dark portion in the roots and it is spreading. I also see white spots in lower section of the seed. I am afraid if it is some kind of infection. Kindly help..

Thanks
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Anurag Churi
Sydney
13th June 2018 1:08am
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Original Post was last edited: 14th June 2018 3:59pm
David01 says...
Hi Anurag,

You need to remove the outer skin or seedcoat and clean it thoroughly before using toothpick method otherwise, it will get bacteria growing on the leftover flesh or seedcoat. In your case I suggest:

1. use tooth brush to remove all the white spots on the seed
2. spay Rubbing Alcohol over the seed and root
3. wash the seed with tap water
4. You need to change the water in the
container/bottle once a week. Cheers.
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David01
CRAIGIEBURN,3064,VIC
13th June 2018 11:48am
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Original Post was last edited: 13th June 2018 5:01pm
brad16 says...
I understand that many people search the Web for information on growing avocado from seed, and the toothpicks always comes up.

Please everyone, stop growing avocado this way. It's a science experiment to amaze and dazzle school kids.

If you are intrigued and want to see a seed sprout roots, it's an interesting thing watch, but if you want to grow a tree ... plant it, like any other seed, with the flat end and the 'dimple' facing down.

If your seed has been in the water since March, it's been too long. It will be encouraging rot and when you try to plant it, you will have fragile roots that will need to be surrounded by soil and prone to damage.

Planting directly in soil with the tip of the seed poking up from the top means that the roots grow into the soil by themselves, and the seeds germinate exceptionally well. Once you see seed split apart and a shoot coming up from between the two halves, you already have substantial root system in the soil below.

For everyone wanting to grow a tree ... pot the seed in soil/potting mix. Leave the toothpicks in the kitchen cupboard.
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brad16
GOROKAN,2263,NSW
14th June 2018 10:53am
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Anurag Churi says...
Hi David,
Thank a lot for your inputs. I will try the same and updat the thread. I had uploaded pics of the plant but they are somhow not available. I am uploading them again. Kindly have a look.

Thanks.
Pictures - Click to enlarge

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Picture: 3

Picture: 4

Picture: 5
 
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Anurag Churi
Sydney
14th June 2018 4:12pm
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Original Post was last edited: 14th June 2018 4:15pm
David01 says...
Hi Anurag,

You need to remove the black mould with the soft tooth brush. And other steps as suggested in previous forum.
Replace with 1/2 l bottle of coke as your cup is too short for the future roots grow. Wait until spring plant it in the good soil. Alternately, you can plant it in a small container with good potting mixed but keep it inside and transplant it in spring when the weather get warmer. Cheers
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David01
CRAIGIEBURN,3064,VIC
15th June 2018 1:35pm
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Original Post was last edited: 15th June 2018 1:42pm
Anurag Churi says...
Dear David / Brad,
Thanks a lot for your replies. As per your advice, i have cleaned the roots using rubbing alchohol and now planted in pot. But now i see that the oldest leave has turned brown and all other small leaves tip are brown. I have attached pics. Kindly suggest.

Cheers!!
Pictures - Click to enlarge

Picture: 1

Picture: 2

Picture: 3
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Anurag Churi
Sydney
21st June 2018 4:45pm
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brad16 says...
Anurag,

It look ok to me. Avocado can have red-ish flushes.
Keep an eye on it though. It just went through a traumatic experience but seems to be coping quite well.
One thing I would suggest ... those terracotta pots usually just have a single small hole in the centre for drainage. Especially at the moment (winter and change of environment) don't let that pot sit on a saucer of water. Let it drain as thoroughly as possible, so maybe try sitting it on 3 little blocks (like lego or something) to keep the bottom of the pot out of the water that drains out into the saucer. I'm not saying to let it dry out, just not to let it sit in water.

My basic idea is very poorly sketched in the attached picture. It's just an idea that may safe-guard against unintentional overwatering (since this little guy came all the way from Africa, I assume you have big hopes for it).
Pictures - Click to enlarge

Picture: 1
  
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brad16
GOROKAN,2263,NSW
22nd June 2018 1:53pm
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Original Post was last edited: 22nd June 2018 1:55pm
David01 says...
Hi Anurag,
You photos was not sharp enough to identify the problem. However, young Avocado leaves color are reddish and stay in that color for a few weeks then change to green. The potting mix should contain no fertilise and free of saline at this stage. Cheers
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David01
CRAIGIEBURN,3064,VIC
22nd June 2018 7:25pm
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Original Post was last edited: 22nd June 2018 7:33pm
Anurag Churi says...
Hi Brad / David,

Uploading clearer pictures again...please have a look and convey your expert advise.
All the tiny leaves are brown at the tip and they turn complete brown once fully grown. The fully grwon leaves are shiny (waxy) and have green veins.

@Brad,
You nailed it buddy. I am really having high hopes from this one, as its not a commercial grafted fruit. I read that if you use a seed of commerical avocado seed would never bear fruits. So fingers crossed...





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Picture: 1

Picture: 2

Picture: 3
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Anurag Churi
Sydney
27th June 2018 5:55pm
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brad16 says...
Hi Anurag,

The plant looks healthy. It looks like a nice spot for it near the window. If it was outside in direct sunlight, the colours wouldn't be as dark and deep.
The colour and shine is what I'd expect to see, and would be similar to one grown in a shade house.

The soil looks like it came from the backyard. It appears to be quite heavy and clayey, so be careful with the amount of water you put into it. You may have read that avocados need free draining soil.

Are you planning to eventually plant it in the yard, where that soil came from?

If so, start thinking about improving the drainage. The Sydney climate can be temperamental. It can rain solid for weeks, or can be dry just the same. In dry periods you can always irrigate or water, but in rainy periods, an avocado can die in that sort soil without doing something about drainage. There are a few things you can do, but I'll leave that for later if no-one else decides to chime in. Other people will have more experience with clay than myself, but I do have an idea that involves a pillow case ;)
(hint: it's just a bodgie home-surplus grow bag which will form the nucleus of a raised mound)
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brad16
GOROKAN,2263,NSW
28th June 2018 11:00pm
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David01 says...
Hi Anurag,

Your Avocado seedling looks good. Cheers.
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David01
CRAIGIEBURN,3064,VIC
29th June 2018 7:04pm
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Anurag Churi says...
Thank you friends for your replies...
Just one question...there are two stems that have come up from the seed...is it fine? Or shall cut the smaller one off to stimulate the growth of bigger one?

I also saw two small holes on two oldest leaves (one on each).
I hope there is nothing to worry..

@Brad,
I bought the soil and pot from the market. Also the guy suggested to me put vermicompost. I havent
planned about its planting...but preferably i will do it in the back yard..
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Picture: 2

Picture: 3
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Anurag Churi
Sydney
1st July 2018 7:51pm
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Original Post was last edited: 2nd July 2018 10:56pm
David01 says...
Hi Anurag,

Don't change any thing until your seedling is stable (in sept). You need to remove the weakest (small) stem by then but not now. I don't use the Vermicompost so I can't comment on it. Cheers.
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David01
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2nd July 2018 3:52pm
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