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mango tree very sick

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stefano starts with ...
Hello, Was reading a few posts regarding mango trees on this website. I thought to post my issues, as there looks to be some tree experts here.
i have what appears to be a very sick mango tree, as you can see from the photos, there is a very large rotted trunk leading into the soil and the branches look to be very very dry. in one image you can see there is some white 'fungus' or similar. the funny thing is the tree produces awesome mangoes seasonally. this tree has been here since we moved in. i LOVE my mangoes and so do the kids, so we don't want to lose the tree, i would love to get it back to full health, my concern is the size of the rot at the trunk base may be a safety concern, with the tree potentially falling over??
and this season a couple of mangoes have a brownish rot type look at the tops where it joins the branch
any help would be very much appreciated - please keep in mind i am not a green thumb so in explaining any solutions please be a little thorough.

if you need further information or specific photos - i can easily take more.

thank you

Stefano
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stefano
Winston Hills NSW
13th January 2018 12:04pm
#UserID: 17701
Posts: 4
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Original Post was last edited: 13th January 2018 12:05pm
Fruitylicious1 says...
Hi Stefano

Your beloved tree is currently infected with collar rot fungus (Phytophtora) that invades a trees lower trunk or upper roots and begin to block the trees vascular system. The infection point often develop as a canker (infected wound) which causes a girdling (strangulation) of the tree as it develops and ultimately killing it by blocking food up and down the leaves to the roots and vice versa.

It is recommended that you prune all of the infected branches to avoid spreading it further up and down the tree and also to lessen the weight of the tree thus preventing it to easily fall down even if it means sacrificing some of the precious fruits. It is also important to maintain proper drainage in and around the tree. Don't let water pool around the base of the tree. Don't mulch the tree as well for proper air movement around the wound. Remember to sanitize all the pruning tools that you will use to avoid infecting your other plants. You can use the good old bleach. Just dilute it with water: 1% bleach to 10% water. You can also fertilize the tree with a high phosphorus formulation to stimulate root growth. Just spread it along the drip line soil at a rate of 3 to 5 pounds for each inch of trunk diameter.

With regards to chemical treatment you can use Yates anti rot to kill the fungus because it is readily available anywhere (like Bunnings). But i must warn you that it will have a limited success given the severity of your mango tree disease. All we can do now is to try to prolong the life and ease the suffering and burden of the ailing mango tree.

There is however another product that is more effective and less invasive to the environment. It is called 'chemjet injector'. It allows the operator to inject vital chemical treatment directly into the trunk of the tree by utilizing the trees natural transport system to distribute the fungicide where it is vitally needed.

The injector is placed in the tree by drilling a 4.2 mm or 11/64 hole 50mm deep then utilizing the tapered nozzle to secure the injector firmly in place. Turning the handle clockwise will then release the device and inject the tree with the desired amount of chemical.

The best fungicide so far for the treatment of phytophtora is phosphonate compound marketed under the name 'Aliette' made by Bayer because of its low toxicity to mammals and its more environmentally friendly than other chemicals. You can use this chemical in conjunction with the tree injector to boost its effectiveness. Or you can use it as a paint and drench to the entire tree to a lesser extent of effectiveness. The choice is up to you.

You can go to their website and learn more about this treatment. You can even call them to guide you through the process when needed. Their web site: www.chemjet.com.au
Tel:+617 3267 0611
Address: 8 Ivedon St., Banyo, Queensland
4014, Australia

I hope those infos will help alleviate the suffering of your dear mango tree and eventually nurse it back to good health.

Happy Gardening :-)

P.S.

I have also uploaded an image of a diseased mango tree with almost the same condition as yours for comparison purposes.
Pictures - Click to enlarge

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Fruitylicious1
TAMWORTH,2340,NSW
14th January 2018 1:46pm
#UserID: 16885
Posts: 567
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Original Post was last edited: 14th January 2018 8:48pm
stefano says...
Hi Fruitylicious1,

thank you so much for your prompt reply and very informative diagnosis and treatment of our mango tree.
I will look into these solutions.

should I wait until my fruit is picked, which would be within the month before I prune ?

thank you
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stefano
Winston Hills NSW
16th January 2018 12:07pm
#UserID: 17701
Posts: 4
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Fruitylicious1 says...
Hi Stefano

Sure you can mate. Enjoy the fruits and perform the necessary treatment after the harvest. I hope you can share some of your spoils for me. Just joking.

By the way if you're planning to use Aliette as a soil drench incorporate a soil wetting agent into the Aliette compound mix to make it even more effective.

For your own safety you can ask the services of a tree surgeon to do the pruning. I know it may cost you an arm and a leg. But as always safety first should always be followed.


Happy Gardening :-)
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Fruitylicious1
TAMWORTH,2340,NSW
16th January 2018 1:24pm
#UserID: 16885
Posts: 567
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Original Post was last edited: 16th January 2018 7:27pm
denise1 says...
You may need to chisel back rotted wood at the base and get a tree surgeon to fill it but it could still keep rotting back and the tree eventually fall over. You could delay the inevitable but best to make a visit to a nursery and find a new healthy tree that is eager to grow in your garden and last many years.
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denise1
auckland NZ
17th January 2018 1:49pm
#UserID: 6832
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stefano says...
Hello Fruitylicious1,

I know its been a little while, I have been waiting to pick all my mangos and give the tree a little breathing room.

I am now preparing the treatment for the phytophtora and you say the best treatment is Aliette. I am planning to treat through the chemjet system, I have just placed order for 6 injectors now looking to source the Aliette. It doesn't seem to be easily available (at least online) do you know where I could buy this over the counter near Winston hills ? is there only one type of Aliette as I can only see Aliette WG ? do you know what dosage I need and what size Aliette would cover it?
I am assuming I can use Aliette using the chemjets?
sorry for all the questions - I want to get it right.
p.s the mangoes were delicious so tree is worth saving if at all possible.
any other advise you could add welcome.
many thanks
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stefano
Winston Hills NSW
4th April 2018 11:40am
#UserID: 17701
Posts: 4
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Fruitylicious1 says...
Hi Stefano

You can contact Graham Nicol the local Bayer sales rep in your area. You can direct all your queries to him with regards to dosage and frequency of application and of course price and availability.

Name: Graham Nicol - Commercial Sales Rep for Bayer

Mobile: +61417374863
Email: graham.nicol@bayer.com

I might also add if you can stabilize the mango tree by by using robust metal stakes and wide and smooth guys preferably on the upwind side of the tree to prevent it from toppling down during windy episodes.

As Always happy gardening :-)
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Fruitylicious1
TAMWORTH,2340,NSW
4th April 2018 6:00pm
#UserID: 16885
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Original Post was last edited: 4th April 2018 6:11pm
stefano says...
many thanks Fruitylicious1. I have emailed Graham and awaiting response.

thanks again for all your help thus far
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stefano
Winston Hills NSW
5th April 2018 12:53pm
#UserID: 17701
Posts: 4
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