Mango Pests, Diseases, and Nutritional Problems

[tirandaz]

Tirandaz,
Use Gypsum, Calcium Sulfate.  Unlike lime, gypsum doesn't raise the pH;  raising pH tends to tie-up many nutrients.

Thank you Har  ,  someone at the nursery had recommended   oyster shells what  are thoughts about that ?
How do I supplement Boron ?

How much Gypsum should I apply around each tree which are 4 yrs old?

[Oolie]

Go nuts.

The application ratio of gypsum is hard to exceed.

[Jaboticaba45]

So when do I pick this mallika mango?

[achetadomestica]

For me this year the my first 2 Malikas turned yellow on the tree and I picked
them and they were very sweet. I watched a youtube video and it said to pick them
green when the shoulders are full and wrap in newspaper. I tried this on 5 or 6
and they turned yellow in around a week and they were very sweet also.
I also ate one still green and a little firmer then when they were yellow and
it was a little tangy and sweet. I ended up with around 20 this year and most
of them I ate yellow and they were sweet. I need more practice but it looks like
the mango in the picture has full shoulders and will ripen nicely in newspaper.
My malikas started getting ripe at the beginning of June and I was done before July.
Is it your only fruit?

[bsbullie]

Yes, correct, the shoulders should fill out.  Also keep an eye on the stem, it should turn brown where it connects to the mango (its still very green).  It can be picked from mature green and ripened it a warm location (not an air conditioned room) or at first yellow color break.

The taste should be very sweet with the orange creamsicle flavor profile  (with similarities to LZ but a prefect Mallika can be better than a LZ in my opinion).

[Jaboticaba45]

For me this year the my first 2 Malikas turned yellow on the tree and I picked
them and they were very sweet. I watched a youtube video and it said to pick them
green when the shoulders are full and wrap in newspaper. I tried this on 5 or 6
and they turned yellow in around a week and they were very sweet also.
I also ate one still green and a little firmer then when they were yellow and
it was a little tangy and sweet. I ended up with around 20 this year and most
of them I ate yellow and they were sweet. I need more practice but it looks like
the mango in the picture has full shoulders and will ripen nicely in newspaper.
My malikas started getting ripe at the beginning of June and I was done before July.
Is it your only fruit?

I have 4 more on the tree but they are smaller and dont look ready.

[Guanabanus]

This thread is about disease and plant-nutrition problems, not about variety flavors and harvesting times.

[tirandaz]

Go nuts.

The application ratio of gypsum is hard to exceed/quote]
So just to clarify, 2-3 lbs of gypsum around these trees will not hurt

[Oolie]

Not likely. I say go for it.

[Guanabanus]

Spread widely, from near the trunk, out to twice the length of the longest side branch.

[ammoun]

Besides the leaf tip salt burn, are the dark spots on the top set anthracnose? (This is an old image)

Could flies increase anthracnose? I notice them very often hanging on mango leaves.

[Guanabanus]

Ammoun,

The top leaves' burn looks like excessive Boron.

[ammoun]

Thank you Har.

It just seems to me that Boron toxicity spots would be more evenly distributed on the leaf, don't you think?

[UplanderCA]

Hello,
I have a cocktail mango tree with several grafts pushing new growth (3 & 4 growth flush).  I have one graft (Mahachanok) where the growth is mottled looking.  The other grafts are growing normally.  I don't believe it's a fertilizer issue or all of the other new growth would be affected.  It looks like an infection of some sort.  Attached are photos of the affected growth.  I just notice that the third photo on a different MC branch includes an insect (small grasshopper?).  I'm not aware that grasshoppers are a pest on Mango trees.
Only the MC new growth is affected.  The orange sherbet, lemon zest, NDM, and Carrie new growth doesn't have the leaf issue.   Should I cut out the affected new growth?

Note: the graft is about 8 ft. high.  No chemicals were used or sprayed in the area.  However, about a 8 weeks ago, I painted the trunk with white tree trunk paint (Arizona's Best). I typically lightly spray and wash down the entire tree once a week after the sun sets to remove the spider webs and dust from the leaves.

Maha discolored leaves


Close-up of Maha leaves (orange sherbet graft next to Maha with normal growth)


Different Maha branch with insect



Tony

[Guanabanus]

Uplander,
That may be Powdery Mildew, but that is unusual in the heat of Summer.  Maybe it is another fungus.

The interveinal blackening looks like severe Potassium deficiency, but that probably would not distort the leaves like that. 

Hopefully someone else will know.

[UplanderCA]

Har,

Thank-you for the reply.   I only see powdery mildew in the winter time on the NDM mango tree and the roses.  The last three weeks had high day-time temperatures 89-105, evening temperatures 68-78.  Full Sun, no rain, little to no humidity, and a dusting of ash from the wildfires.  My last application of fertilizer was July 18 with Ironite Plus 12-10-10 with secondary and micro-nutrients.  I have a 2" layer of mulch of pine and oak from a tree trimming outfit.  I deep water once a week.
All my mango trees are loving the high temperatures as there has been constant growth flushes the past month.   My concern is that I haven't seen the strange discoloration before and it doesn't look healthy.  I'm keeping a close watch on this.  Any additional information and help is greatly appreciated.

Tony

[tirandaz]

Spread widely, from near the trunk, out to twice the length of the longest side branch.

( 1 inch

Thanks for your suggestions
What can I use as a sealant after prunnig 1 inch or more thicker branches and after Bark grafting.

[Guanabanus]

Tirandaz,
We don't normally recommend sealing pruning cuts in Florida climate.  I am not sure about it in desert climates.

[Guanabanus]

UplanderCA,

Low 70's F. at night is cool enough for Powdery Mildew to activate, if there is some available humidity on leaf surfaces.  Have you had any dew?

[tirandaz]

Tirandaz,
We don't normally recommend sealing pruning cuts in Florida climate.  I am not sure about it in desert climates.

Thanks, but what about sealing after Bark grafting?

[Mark in Texas]

Thanks, but what about sealing after Bark grafting?

Parafilm or buddy tape work great.

Never seal pruning cuts.

PM does not flourish when temps are 90+.

Your leaves suggest some kind of virus.  Best all around copper pentahydrate system spray is Magnabon CS2005.  2 tsp/gallon.  DO NOT forget to add a non ionic surfactant.

Good luck...

[UplanderCA]

UplanderCA,

Low 70's F. at night is cool enough for Powdery Mildew to activate, if there is some available humidity on leaf surfaces.  Have you had any dew?

Har,
No dew forming that I'm aware of...very little humidity. (almost the same environment as Palm Springs except 10-20 degrees cooler).  Most of the leaves have dropped - see photo.


A 3rd branch from the Maha scion also has some of the same symptom...not as severe


Mark,
Thank-you for the info on Magnabon CS2005.  Would Jet-Dry work as the non-ionic surfactant?

Tony

[UplanderCA]

Hello Again,

I have been paying close attention to my mango trees because of potential fungal / virus infection responses to my previous posts.  I have two photos and I'm wondering if the trees have nutritional issues. 
The majority look like the following photo or are a much darker shade of green (which I consider normal and healthy).



I have seen a few leaves of the newer (growth 3-4 weeks) with the following mottled coloration.

Is this coloration and pattern normal? 

Thanks in advance for any info and help.

Tony

[Guanabanus]

UplanderCA,
Looks like Manganese and Potassium deficiencies.

What have you fertilized with lately?  And what is your soils' pH?

[Mango Stein]

My Kwan mango gets powdery mildew every year. I have thought about using mancozeb, but it is quite toxic. Also, the product labels never mention treating mango and when I asked the manufacturer they said they don't know.

I have since read that home remedies are quite effective: 60% milk solution or bicarbonate solution or vinegar solution. Anyone have success with these? I also read neem oil works on powdery mildew, however it is not supposed to be sprayed on flowers. But that is exactly where powdery mildew starts in mangoes...