My basil has a weird problem that seems to be spreading on the leaves. It's basically white spots that are thinner surrounded by black spots.

I tried to find information online but couldn't find this.

Thanks for the help!

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  • I would suggest that you amputate. – Rob Dec 11 '18 at 21:18

This looks like an insect that eats the material between the walls of the leaves: a leaf miner. You can see the translucent areas where the leaves have been eaten and the black spots are "frass" or excreta from the adults.

Seeing as this is a plant that you want to be able to consume the leaves of this makes applying any pest control difficult. As it is an annual I agree that throwing the plant out is the most effective method of control.

You should also check your other plants in case they might have issues as well.

I suspect this is thrip as the damage looks similar to here. If I'm right you should be able to use a magnifying glass and see the adults or larvae on the undersides of the leaves. The adults fly and can spread to many other plants.

  • Thank you! I will try to amputate more and see if it stops. Do they go away when I replant the basil after a while? – euge9522 Dec 12 '18 at 9:18
  • @euge9522 If they are on other plants they will spread back. Thrip are very hard to get rid of – kevinsky Dec 12 '18 at 11:22

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