Spraying JS in a very humid environment

D K
2024-08-12
read : 2287

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Hello, Mr. President!

Every day, I learn something new from reading your answers.

Thank you for this opportunity to improve my knowledge about organic farming.

Yesterday I wrote:

If humidity stays high for a very long time, high concentrations of JS can burn tender parts of some plant species.

And you replied:

You don't have to worry about this part.

I think this is very interesting and important to clarify. So I have two questions.

1.

My students observed and documented this many times:

Natural Pesticide number 4 (1.2L JS, 3L JWA, 500L soft water) was sprayed on young sickly seedlings infected with Powdery Midew.

These seedlings have only seen artificial light and never seen sunlight throughout their life.

The nursery always has humid air all day and all night.

A few days after spraying JNP number 4, some leaves become burned and have an odd mutant shapes.

I always assumed that the reason for this damage was plants remaining wet and covered in fungicide for a very long time. Is this assumption wrong?

2.

My parents are grape farmers.

Every time it rains, grapes become infected with Powdery Mildew.

I know from reading the JADAM books that Natural Pesticide number 4 (1.2L JS, 3L JWA, 500L soft water) is effective against Powdery Mildew.

I also know from my personal interaction with the President of JADAM that grapes are sensitive to JS, so JS has to be used on grapes diluted 1000 times. Which is a much weaker dilution than the one that is recommended for treating Powdery Mildew.

Fortunately, the JADAM Organic Farming also states that "If you increase JWA, pesticide and germicide effects increase." and that "If pesticide evaporates quickly, it is ineffective."

So in order to battle Powdery Mildew on grapes, I used JS diluted 1000 times but increased the amount of JWA to 1:70 and sometimes even to 1:50, and it worked well.

But one day, after a series of rains, I sprayed this solution on grapes in the evening, and the whole night was so humid that the fungicide did not evaporate until the next morning. A few days after that, the leaves on my grapes became hard like paper, and there were signs of chemical burn.

So I assumed that since “The good and the bad are one”, I should not spray JS on grapes in weather conditions when the pesticide stays wet on leaves for a very, very long time. Is this assumption also wrong?

Now, after reading your recent comments, I realized that I might have been mistaken in my assumptions, and that, based on those assumptions, I might have given people bad advice.

Please help me understand this.

Thank you!

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숨결 2024-08-13 08:34:52
I can't make an absolute judgment, but it is very difficult for concentration disorders to occur due to overwatering. I think there may be other causes. The phenomenon of grape leaves drying up can also occur due to JS, even if it is not overwatering.

If you have the opportunity, overwatering I recommend you to try a repeat experiment in this situation.
I have planted about 10 vineyards in the field and am doing various experiments. The core of the experiment is how to overcome the damage of JS. I am looking forward to good results.

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