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White patches on leaves

This is a discussion on White patches on leaves within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; You could look for mites but not see them because they are so small. If ...

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  1. #21
    ang709's Avatar
    ang709 is offline Loves 'chids
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    You could look for mites but not see them because they are so small. If I suspect mites, I rub a tissue on the underside of the leaf. If the tissue gets red streaks, I know it's bad news.
    I've had success battling mites using a product called Trounce that I order online. Maybe not available in your area though? It is a combination of insecticidal soap and pyrethrins. Pyrethrins are made from a plant (chrysanthemums, specifically) and are supposed to be safe to use even on food crops.
    Whatever you use, be persistent. Wishing you success!

  2. #22
    eeyore is offline Senior Member
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    Angie & Kim, many thanks for your suggestions! I will keep going with the neem oil for now since I've already started and see how it goes as I understand it takes a few weeks to be effective but appreciate all the different ideas!

  3. #23
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    Carolla is offline Senior Member
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    One thing to be aware of with neem oil is that the oil droplets can cause physical damage (little burnt spots) to the leaves if the sun is on them when the oil is still wet. The oil droplets magnify the sun, causing hot spots. Just when you use neem, keep them out of direct sun for a couple of days to avoid this.

  4. #24
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    citywildcat is offline Senior Member
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    Quote Originally Posted by Carolla View Post
    One thing to be aware of with neem oil is that the oil droplets can cause physical damage (little burnt spots) to the leaves if the sun is on them when the oil is still wet. The oil droplets magnify the sun, causing hot spots. Just when you use neem, keep them out of direct sun for a couple of days to avoid this.
    CAROLLA, thanks for posting this important tip! I had that experience many, many years ago, when I first began indoor gardening, growing under lights. I noticed any of the plants that were treated with pesticides would often have "burnt spots" on them, like you described. I believe SOME pesticides back then were even labeled not to put the plant in the light after using the product. However, I rarely see that warning anymore. Any substance with an oily base, such as Orchid Myst, will do the same thing. Placing the plant in a shaded spot solves the problem, again, as you mentioned. This is somewhat related: many people don't observe their plants enough, (or anything they DO something to), to make "deductive reasoning" WORK the way it's supposed to, in our brain. For example: some people have the belief that "if a little is good, more is better". They may EXCEED DOSAGE DIRECTIONS for fertilizer and wonder why the grass is burned, WITHOUT CONNECTING THE TWO EVENTS, LOL. Success in many things in life has a lot to do with KEEN observation and deductive reasoning

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