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Hi guys, this is the situation: I had a problem with mealybugs so I decided to use a mineral oil solution (1.5%) once a week for 4 weeks. The solution was nebulised on the leaves. Now there are no more bugs on the tree but I spotted some strange brown-gray stains on some leaves ( about 5 leaves are affected). I immediately thought about a solor exposition problem correleted with the use of oil. What do you think? Thank you and sorry for my english.
P.s. It's a Japanese maple bonsai, stimeted age 7 years.

looks like some form of burn indeed. If it does not spread, I would not worry about it.

Could be overwatered also. What area do you live in? What type of soil? And how often do you water. Leaf burn is common on young japanese maples of green varieties. But when older can generally take more sun. JM like moist free draining soil but not water logged.

Chris

I water once a day (about 250 ml) and the temperature is about 25-30 °C, i'll try to reduce the water supply. Thank you!

Don't water on a schedule, water when the plant needs it.


Ed

this is not the result from too much water.

Bors wrote: I water once a day (about 250 ml) and the temperature is about 25-30 °C, i'll try to reduce the water supply. Thank you!

You measure your water? Like leatherback says, when they start to dry. The last couple of weeks, it was every day, on most of mine, but it's cooling down a bit now. I just take the hose or water can, and soak them real good.