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My ficus bonsai has these brown spots:

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It's only a few leaves, but obviously I want to get ahead of it. Preliminary Googlage says that this can be caused by bacteria or fungi or insects: how can I tell which it is, so I can treat the problem correctly?

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  • How is your drainage? Are the pot and the soils well drained? – benn Jul 14 '20 at 16:46
  • @benn Looks OK to me. – crmdgn Jul 15 '20 at 11:21
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Looks like insect or fungi damage, you could prune the bad leaves off then spray the rest of the leaves with any kind of leave spray or homemade dish soap + water mix. If you use a homemade solution, spray top and bottom of the leaves and let it sit on the leaves for a few mins then spray it with water to wash it off, once a week until everything looks good.

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