Mango Pests, Diseases, and Nutritional Problems

[Guanabanus]

Food-grade Potassium Bicarbonate leavening works.  It is better for the trees than Baking Soda (Sodium Bicarbonate).

[Mango Stein]

Thanks Guanabanus. Do I have to spray the foliage too? Because the Kwan's leaves seem to be completely unaffected by powdery mildew... though I am not sure if they can still covertly harbor the fungus that then ravage the flowers.

[UplanderCA]

UplanderCA,
Looks like Manganese and Potassium deficiencies.

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

Har,

Using a Luster Leaf Rapidtest Digital Soil pH meter (model 1845), I get an average reading of 6.6 pH reading.  I took 9 sample readings at various distances from the trunk 1 ft, 3 ft. and 6 ft.  Lowest reading was 6.4, Highest was 6.7.  The last time any type was applied was in in early July.  Ironite plus 12-10-10, plus essential micro-nutrients.

Tony

[Guanabanus]

Uplander,

That all sounds good.

Sometimes, the deficiency in the leaves is simply caused by a temporary condition that reduces the efficiency of the roots, right while some new growth is expanding---  most commonly from the topsoil's having gotten too dry for a couple of days, which kills off hair-roots.  If the soil gets waterlogged for days, or gets too cold or too hot, the hair-roots are also impacted.

[Mark in Texas]

Uplander,

That all sounds good.

Sometimes, the deficiency in the leaves is simply caused by a temporary condition that reduces the efficiency of the roots, right while some new growth is expanding---  most commonly from the topsoil's having gotten too dry for a couple of days, which kills off hair-roots.  If the soil gets waterlogged for days, or gets too cold or too hot, the hair-roots are also impacted.

It's "root hars", not hair-roots, har

[tirandaz]

 Hi
these are white winged beetle like insects  possibly eating mango  and lyche leaves  does anybody know what they are and how can they be treated ,How damaging are they to the tree
THank You

[Guanabanus]

Sri Lankan weevil,

Only important when trees are small, such as under 5-feet tall.  Smash them.

[Jaboticaba45]

Is this normal? Fruit punch mango has "veins" on the new flush. Should I be worried? Thanks.

[tirandaz]

Is this normal? Fruit punch mango has "veins" on the new flush. Should I be worried? Thanks.

thanks

[Guanabanus]

It does look a bit crinkley and bulgey.  Please show it to us again when the leaves harden up.

[Mango Stein]

Hey 'Banus, what do you think the leaves here are suffering from? Not many on the tree, but here and there.

[Guanabanus]

Old spray burn.

[Danielofthecastle]

Hello All, have a Coconut Cream in 25 gallon pot, grown outside on concrete patio( in 25g pot stands about 8 ft tall). Soil: Peat moss, pearlite, local soil (Palm Beach Gardens) . I started noticing these black cracks or slots in the branches. Looks like a combo of Canker and Gummosis !?!? Early August I cut back branches to increase circulation and decrease bacterial/ fungal pressures. Besides copper fungicide every week for 6-10 weeks is there any advantageous adjuvant ( short of pugging the tree... if I must, so be it). The lowest non-affected portion is about 2 inches below the main crotch (branching point) of the tree.

[Guanabanus]

Either Pentra-Bark or Kinetic are good adjuvants to increase penetration.  Many other products are, presumably, just as good.
About 1/4 teaspoon per gallon.  1/2 teaspoon probably O.K.  [Higher rates of adjuvants often cause harm.]

Adding a multi micro-nutrient product, such as chelates or seaweed extract, could also be useful.  And use gypsum on the soil when you fertilize, to keep a good balance of nutrients.

[Danielofthecastle]

Thank You for your timely response Har!!

Would you cut off branches with black cuts/ pugg under lowest lesion? My concern being that it has penetrated the tree and potentially rot in the future...then back to square one?


Where is the best (price) place to purchase such said products (i.e., adjuvants, micro-nutrients, chelates, gypsum (in Palm Beach County?))? I have used Diamond Fertilizer (too far), and/or Big Box stores?

[Guanabanus]

Don't cut off any more, and one of those is just old sunburn on the green branch.

Try the internet.  Try Landscape Site One.  Or Universal Grower's Supply in Pompano.  Also Truly Tropical has Gypsum.

[keri_guy]

Can someone help me as to why my mango leaves are pale green? Does it need more fertilizer or does it have some type of disease.

[Danielofthecastle]

Nothing is wrong, it’s just new growth. It will darken up as it matures, no worries.

[ibliz]

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

Hi Uplander,

I had experienced the same leaves distortion and necrosis back in 2015. Back then i recorded it as unknown disorder.




But now I am quite convinced it was mango scab. Easily fixed by copper

[Guanabanus]

Ibliz,

Interesting that Copper resolved that.

It looks like Zinc deficiency.

[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

Hi Uplander,

I had experienced the same leaves distortion and necrosis back in 2015. Back then i recorded it as unknown disorder.




But now I am quite convinced it was mango scab. Easily fixed by copper

Hi ibliz,

Thank-you for the reply.  I'm not sure what was the cause for the strange growth and discoloration of the leaves.  However, I do suspect an insect infestation of some sort...possibly some newly hatched grasshoppers that feasted on the tender new growth.  I have found grasshoppers next to new growth missing sections of leaves.  I also saw a previous post by Skahm and Cookie Monster on April 23, 2016 with the exact same strange growth and discoloration on new growth due to insect infestation.  I believe that Sevin was applied to new growth and appeared to correct the situation.   I haven't applied any insecticide at this point as the affected leaves have dropped and the new growth appears to be normal.

Tony

[TheFlyingFarmer]

just bought a 7 gal cogshall and was wondering if any of this looks normal to you guys.

[Guanabanus]

Fifth picture looks like old sunburn, when plant was tipped over.

[FruitGrower]

I noticed some of the leaves on my Mahachanok were growing deformed. It’s only a few branches on an otherwise healthy looking tree. I have never seen this before, has anyone else?

[Guanabanus]

At an earlier, more tender stage of new growth, there may have been some insects on it, such as aphids or potato leaf-hoppers.  Or heat stress?

While the leaves are still partially tender, is a good time to apply nutritional sprays.