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This is a discussion on yellowing leaves within the General Orchid Culture forums, part of the Orchid Culture category; The only pesticide I have used is neem oil. Have you heard of it causing ...
The only pesticide I have used is neem oil. Have you heard of it causing this kind of problem.
I have used neem extensively in the past. I would not call it a pesticide because it doesn't really do much bug killing. At least, no more than any oil would. I'm not saying don't use it, but it's hard to eradicate anything more than a passing bug with neem. It does work well as a leaf polish, though.
The problem with using any type of oil is the risk of burn. You really want to keep the plants away from direct midday sunlight for at least a few days (maybe even a week) after spraying an oil. The oil absorbs a tremendous amount of heat and the plants will literally burn to a crisp if enough sun gets to them. Early sunburn can manifest as bleaching or yellowing, I think.