The Internet's Finest Tropical Fruit Discussion Forum!"All discussion content within the forum reflects the views of the individual participants and does not necessarily represent the views held by the Tropical Fruit Forum as an organization."
EvilFruit, what's the NPK of the food that mango is getting, what's your soil profile like including the pH? Not a Mg issue. Mg deficiencies only show on lower leaves as a pale yellow hue but can work its way to the mid level. It's a mineral transportation thingie regarding Mg.
Thank you Har. I have looked up pics of Mango Scale and you are correct.I initially tried to simply wipe the white spots off the mango leaves, but they came back.In this forum you have suggested Neem oil and Insecticidal Soap as remedies. Does liquid Sevin work? I also found a link suggesting Bayer Tempo SC. Any experience with this?
QuoteEvilFruit, what's the NPK of the food that mango is getting, what's your soil profile like including the pH? Not a Mg issue. Mg deficiencies only show on lower leaves as a pale yellow hue but can work its way to the mid level. It's a mineral transportation thingie regarding Mg. Hi Mark,This mango is supposed to be Ewais or Taimoor Mango from Egypt.My soil is pure sand, desert sand. It is very poor in almost all elements that is essential for plant life. As for NPK, I use water soluble fertilizer (19-19-19+1MgO) that is injected to the irrigation line and granular Fertilizer (8-8-16). I also add Trace Elements powder every three weeks and I use potassium sulfate before the plant start flowering. I don't use the full recommended dosage by the manufacture, I use only 1/3 of recommended dosage and some organic fertilizer (manure, compost) when I have it. I have never tasted my soil pH.Here is the products I use.http://www.adfert.com/product_item/sulotaste/19-19-19.htmlhttp://www.adfert.com/product_item/granular_npk/8-8-16.htmlhttp://www.adfert.com/product_item/ws_TE/combi1.html
Quote from: EvilFruit on May 08, 2019, 06:23:35 PMQuoteEvilFruit, what's the NPK of the food that mango is getting, what's your soil profile like including the pH? Not a Mg issue. Mg deficiencies only show on lower leaves as a pale yellow hue but can work its way to the mid level. It's a mineral transportation thingie regarding Mg. Hi Mark,This mango is supposed to be Ewais or Taimoor Mango from Egypt.My soil is pure sand, desert sand. It is very poor in almost all elements that is essential for plant life. As for NPK, I use water soluble fertilizer (19-19-19+1MgO) that is injected to the irrigation line and granular Fertilizer (8-8-16). I also add Trace Elements powder every three weeks and I use potassium sulfate before the plant start flowering. I don't use the full recommended dosage by the manufacture, I use only 1/3 of recommended dosage and some organic fertilizer (manure, compost) when I have it. I have never tasted my soil pH.Here is the products I use.http://www.adfert.com/product_item/sulotaste/19-19-19.htmlhttp://www.adfert.com/product_item/granular_npk/8-8-16.htmlhttp://www.adfert.com/product_item/ws_TE/combi1.htmlI took a look at the photo of those leaves again. I don't see a real problem based on the mature leaves. They are dark green with no chlorosis evident. The new immature leaves show a very minor chlorosis but nothing I'd be concerned about. I think you're doing a great job considering the challenges you have.
I'm now using Hars 0-3-16 and also recently used keyplex 350 for the micros. However, keyplex 350 caused some damaged to new tender growth. Am I not supposed to spray new growth or perhaps I used too much? I used 1 ounce per gallon following the label. If I went overdosed, what can I do to correct the damage? Thanks!!
Here are some images from different trees. Perhaps because I used "Coco Wet Organic Wetting Agent"?
For those interested, here is a list of EPA Reduced Risk fungicides: https://www.epa.gov/pesticide-registration/reduced-risk-and-organophosphate-alternative-decisions-conventionalSort by pesticide type and look for "F".I wasn't able to achieve adequate control with organic products, but a mix of organic and RR has done reasonably well.
What's ironical is the fact that most organophosphates are very biodegradable and quite safe compared to some of the chlorinated types like the old chlordane. Take malathion for example. It quickly breaks down into the harmless phosphate salt it was created from. You have to know your pesticides.
Thanks a lot guys for your replies. I know it's not fungus because it happened overnight after spraying the trees at night time. I guess I can only use Coco wet for palm trees and start using NIS.
Beats me!What low temperatures did those misshapened fruits go through?What sources and amounts of Boron and Zinc have you provided?