Mango Trees

Kae Bullock starts with ...
I live on the gold coast and have 2 mango trees side by side. Both trees are approx. 5+ years old. Mango 1 has not fruited before, however this year has approx. 20 good sized mangoes. Mango 2 which last year had about 25 large mangos.

Both trees are well fertilized, sprayed with mangozeb and receive 2 weekly solutions of both thrive and liquid posash as well as sea

Mango 1 has developed 2 large cracks in the trunk, which has got wider with heavy rain over the past few weeks.
Question - how can I prevent the cracks from widening and repair the trunk.

Mango 2, despite plenty of flowers no fruit set and the tree is looking very sick with dead leaves. Some of the branches are still green. Have pruned some of the lower branches to relieve stress on tree.

Question: What do I need to do to to fix the tree.

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Mike and JudyJ says...
Kae, have you ever heard of the phrase, " killing with kindness"?

Quote; "Both trees are well fertilized, sprayed with mangozeb and receive 2 weekly solutions of both thrive and liquid posash ".

You are over fertilising to billyo. The tree is trying to grow so fast that it is splitting the bark, OK. Cut with the fertiliser regime and only fertilise the soil at the most three times a year at the rate of about 50 grams per square metre under the canopy ensuring the last dose is applied just before flowering is expected. Use a general fertiliser that is low N and high K at this point. Small doses are far better widely spaced through the year than regular fortnightly doses. To get fruit set, use Mancozeb and copperoxychloride monthly throughout the year to prevent Anthracnose fungus attacking the flowers and fruit, and when flowers start to emerge, give all spraying a rest until fruit have set and about the size of a pea and then recommence the spraying. If there are louse scale or any other types of scale insects, add an insecticide and white oil to the fungicide mix.

Brain says...
I'm going to weight in my 2 cents.

Tree #1, you can get some tree sealant to seal up the exposed areas (think of it as a bandage). However, it won't solve the underlying cause and at best you just hope the tree can heal itself. Not sure what caused it though.

Tree #2, the die back is probably due to extreme stress. I'm going to say, it's due to too much fertiliser (i.e. mineral salts) in the soil and cause the water to be 'displaced' by the tree. I.e. water disolved the salt in soil, tree doesn't like it, and 'stop' taking water. On prior years, there was a lot of rain, so this wasn't an issue. However, in the recent months with the dry, the mineral salts has built up. I'd say if you stop the fertiliser regime and your tree should hopefully recover.

Believe it or not, mango doesn't need too much fertiliser to thrive.

denise1 says...
But seaweed does have a place. Our garden was transformed from hard clay with the piling up of rinsed seaweed. The ancestors in Ireland opened up furrows, filled them with seaweed and planted potatoes on top. The enhanced fertility meant they thrived on a basic diet. Some crops around the world are actually flooded on purpose with semisaline water to boost growth. But yes there are cases against saline too. cheers.

David says...
First pick of the year a ripe Glenn mango and an R2E2 mango .

Craig says...
How can I tell if these 2 years old mango trees will survive after grass fire

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