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Author Topic: Mango Pests, Diseases, and Nutritional Problems  (Read 328401 times)

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1825 on: November 16, 2020, 08:30:01 PM »
Not O.K.   Spray the cracks, and the whole plant with a Copper product that penetrates, such as ones that contain Copper Sulfate Pentahydrate.  Good Copper and Calcium nutrition fortifies bark, and so does soluble Silicon, such as Potassium Silicate products.
Har

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1826 on: November 20, 2020, 03:36:27 PM »
Thanks a lot Har!

Is there a known anomaly with apical buds to halt for no apparent reason? Cold maybe? As you can see, lower buds are engaging.


 

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1827 on: November 20, 2020, 06:52:24 PM »
Probably microscopic bud-mites.  Hard to deal with.  Need systemic miticides.  Or pruning.

Deficiencies of Boron, Copper, Calcium, etc., can also cause terminal bud problems.
Har

Andika

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1828 on: December 07, 2020, 08:04:07 AM »
Hello,

I discovered a black spot on my 2.5 years old mango seedling:( Is this some kind of disease? Should I do something? Thank you for your help!



Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1829 on: December 07, 2020, 02:38:44 PM »
It could be an infection, or it could be sap oozing from a bug bite or other small wound.  Spray with a Copper-containing product that will penetrate.
Har

Dangermouse01

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1830 on: December 07, 2020, 05:06:28 PM »
Hello,

I discovered a black spot on my 2.5 years old mango seedling:( Is this some kind of disease? Should I do something? Thank you for your help!



When zoomed in on it, it kind of looks like some type of soft scale.

Andika

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1831 on: December 08, 2020, 06:16:47 AM »
Thanks Har and Dangermouse01!

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1832 on: December 10, 2020, 08:51:30 AM »
   

This happens every year around this time, temperatures drop to around 44 at night. Rain is scarce but every now and then we get some. Thanks

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1833 on: December 10, 2020, 10:47:23 AM »
Mango Ba, have you had your soil tested?

Cold roots are less able to absorb minerals, so imbalances are more likely to occur. 

The leaves look deficient in Magnesium, or maybe have too much salt; they also may have damage from Thrips insects, which multiply in dry chilly weather.
Har

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1834 on: December 10, 2020, 02:08:48 PM »
Mango Ba, have you had your soil tested?

Cold roots are less able to absorb minerals, so imbalances are more likely to occur. 

The leaves look deficient in Magnesium, or maybe have too much salt; they also may have damage from Thrips insects, which multiply in dry chilly weather.

Thanks!

Here is the test:


Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1835 on: December 10, 2020, 08:41:10 PM »
Check the leaves with a magnifying glass for Thrips or their exoskeletons;  if you find them, then that is, or was, the main problem.  Spray with an insecticide labeled for Thrips.

If Thrips aren't the problem, then sprinkle a handful of elemental Sulfur within an 18-inch circle, and about a teaspoon of Epsom Salt (Magnesium Sulfate).  Some chelated Manganese would also help.  And spray with Copper Sulfate.
Har

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1836 on: December 11, 2020, 03:05:28 PM »
Thank you Har, how much should I put from this product please as I have plenty of it.

https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/Brexil_Multi_Label1k.pdf

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1837 on: December 11, 2020, 05:48:20 PM »
1/4 teaspoon in half a gallon of water.  Repeat in a month.  Still use extra Magnesium;  Epsom Salt is also known as Bitter Salt, and is usually available in pharmacies, for foot soaking.

It may also be beneficial to pull the pebble mulch back a couple of inches from the trunk.

Use granular fertilizer with at least 10% Potassium.
Har

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1838 on: December 12, 2020, 11:35:03 AM »
1/4 teaspoon in half a gallon of water.  Repeat in a month.  Still use extra Magnesium;  Epsom Salt is also known as Bitter Salt, and is usually available in pharmacies, for foot soaking.

It may also be beneficial to pull the pebble mulch back a couple of inches from the trunk.

Use granular fertilizer with at least 10% Potassium.

I was able to acquire 2lb of Magnesium Sulfate, and I already have some Potassium Sulfate. I hope the Sulphate in both products will be enough to substitue the elemental Sulphur since I cannot find it here. I'm unable to see any thrips on the leaves, but I've had multiple symptoms of micro deficiencies in several seedlings. (Pale leaves, stunted growth, leaf deformation...) The colder temperatures seem to trigger extreme deficiencies. For some reason, I was wrongly under the impression that these plants would just stop doing anything during Nov to Feb, so won't need any food.

My collection :):

Magnesium Sulfate
Potassium Sulfate
Diammonium phosphate
12-5-20+2CaO+2MgO 2M Slow release https://icl-sf.com/uk-en/products/turf_amenity/proturf-12-5-20-2cao-2mgo/
20-20-20 + TE Foliar https://www.atlanticaagricola.com/en/fertilizantes-foliaresy-liquidos/plantifol-20-20-20
16-11-10+2MgO+TE 8M Slow release https://icl-sf.com/ie-en/products/ornamental_horticulture/8748-osmocote-pro-8-9m/
Copper
Brexil Multi https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/Brexil_Multi_Label1k.pdf
Sequestrene 138

Summers here are hot, and city water is above 3gr/L. I don't have access to mulch, so I just cover the sand with compost to try to keep as much moisture during the heat, since my access to stored rain water is limited. I put around half a cup of  8M 16-11-10 osmocote pro in the summer and the same amount of 2M 12-5-20 10 weeks ago so it should be all gone.

Here is how it looks after I pulled away the layers of compost, you may see some of 8M osmocote left:



Here an other seedling with what seems to be the same issue just developing, it's driving me crazy.


An other that I think might end up doing the same, those seedlings don't get any water but rain/collected rain, so unless it's fertilizer salt, I would rule out the irrigation water salt.






I will be adding 1/2 teaspoon/gallon of Brexil Multi, I was wondering about the dosage of Mg and K Sulfates please. the seedlings are about 10" tall.

Thank you.
« Last Edit: December 12, 2020, 04:46:55 PM by mangoba »

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1839 on: December 12, 2020, 11:42:21 AM »
An other case, I hope I'm not abusing your niceness Har. The issue with this one is that the new growth started very healthy and happy, until the tempearures starting reaching 45-50f at night. Day temperatures are in the 65-70f. I waited too long for the new growth to harden and get green, but instead the new leaves are just deteriorating.



The white residue is copper.



PS: I wouldn't be surprised if each seedling has a different deficiency since the genetic diversity between them is large.
« Last Edit: December 12, 2020, 12:09:59 PM by mangoba »

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1840 on: December 12, 2020, 05:16:24 PM »
With the 1/2 teaspoon Brexil Multi and 1/4 teaspoon Epsom Salt and 1/2 teaspoon Potassium Sulfate in one gallon of water, put one-half gallon at one plant.
Har

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1841 on: December 12, 2020, 05:19:11 PM »
Avoid adding Nitrogen in late Fall or Winter;  that includes Nitrogen in Compost that is unfinished (that would still go into heat production if the compost were still in a heap one meter high).
Har

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1842 on: December 13, 2020, 07:15:32 AM »
While I was distributing the halves gallon, I saw these insects that triggered a sight that I have been seeing all year regardless of the season. I recorded this video but in a nutshell every time I pour water thousands of these little insects start jumping all over the area. I have never seen them on leaves though. I'm not sure if they are decomposing the organic matter or maybe the thrips that I'm after? Thanks!

https://youtu.be/7wNxCE56jKE
« Last Edit: December 13, 2020, 07:21:24 AM by mangoba »

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1843 on: December 13, 2020, 11:32:04 AM »
I don't have any idea what those insects are.  Not thrips.  Not Fungus Gnats--- at least the ones that I know are black.

Probably your country's agriculture department or federal university would have a pest identification specialist.
Har

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1844 on: December 13, 2020, 07:22:58 PM »
I just learned that they're called Springtails and shouldn't be harmful, I thought you may be interested.

https://www.youtube.com/watch?v=OwOL-MHcQ1w

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1845 on: December 14, 2020, 06:49:55 AM »
Yes, interesting.
Har

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1846 on: December 16, 2020, 06:42:27 PM »
Should I be looking for a chelated Manganese product? I'm not sure if Brexil Multi Mn will be available to the roots, what do you think please?

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1847 on: December 16, 2020, 10:30:13 PM »
The Manganese in Brexil Multi is chelated.  Great for roots.
Har

mangoba

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1848 on: December 19, 2020, 08:58:40 AM »
Har, I was able to find some Sulphur but it was the fongicide version %80 WP. It was about $1.50 per lb. Can this product have an effect on pH if I add it to the soil? If so, how much could I put per seedling please. Thanks!

Guanabanus

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Re: Mango Pests, Diseases, and Nutritional Problems
« Reply #1849 on: December 19, 2020, 10:39:17 AM »
One handful, wearing a rubber or vinyl glove.

The Sulfur will lower the pH, which will be an improvement, making most of the other nutrients more available to the roots.
Har

 

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