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Hi JJ;  The below is from an old topic I was reading and now wondering if you can share the results on your trees from not spraying?

Thanks

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JJReyes     Posted April 10, 2014

The natural cycle for mango trees is to flower and fruit once every two years. The introduction of potassium nitrate spraying allows for an annual harvest because the chemical induces flowering. If you spray twice a year you can get two harvests. The problem is the trees become "senile" at an earlier age. What the University of the Philippines, College of Agriculture in Los Banos also discovered is that the amount of fruit (kilos harvested per tree) starts to go down from year after year of spraying. 

 

If you stop spraying, the trees may go into shock and they might stop producing fruits. Like addicts, the trees become chemical dependent. The thing is no one really knows because most growers will not take the risk. For 2014, I prohibited the spraying of the 200 mango trees on my property just to see what happens. I am not dependent on the harvest income so let's see after a couple of years of no spraying. 

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I've got 85 mango trees on my property, some of them do not produce fruit I am thinking of grafting new trees into old root stock 

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We have about 30 mature trees that were sprayed regularly, the problem now is that they seem to have picked up some disease which gives the fruit black spots.

 

 

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11 minutes ago, Gary D said:

We have about 30 mature trees that were sprayed regularly, the problem now is that they seem to have picked up some disease which gives the fruit black spots.

 

 

That is interesting.  How many years and times per year have you been spraying?  Also do you know what they were spraying?

 

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Yep. Have a tree here in Fl. Lots of mangos last year. None this year.

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1 hour ago, intrepid said:

That is interesting.  How many years and times per year have you been spraying?  Also do you know what they were spraying?

 

That's pretty common but the fruit still good.

 

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10 hours ago, Reboot said:

That's pretty common but the fruit still good.

 

The trees still bare plenty of fruit but most of it drops before ripening.

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Apparently my mango is flowering again this year.

 

 

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