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Crust under leaves. Brown edges. Help

Hi, I'm growing a tomato plant indoors for the first time. It's been a little over a month now and I have noticed some leaves weren't looking too good. There is this strange "crust" under the leaves that looks sort of like dried glue, and the edges of the leaves are turning brown, brittle, and curled. There are also some lighter green spots in the middle of some leaves. I have no idea what it is. Any information would be great. Thanks!

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Joined: Tue Jan 01, 2013 8:32 am
Location: hawaii, zone 12a 587 ft elev.

Re: Crust under leaves. Brown edges. Help

Besides the crustiness, the edges are dry and there is a purple discoloration to the bottom of the leaf as well as some mottling from above.

If you have a hand lens 15x or better take a look under the leaves and see if you find any sucking insects. Thrips are tiny and often leave the leaf edges drying.

How old is this plant? The purple under the leaf may be because this is an older seedling that needs to be planted out or up potted and fertilized. Tomatoes are heavy feeders and they have large root systems, their growth should not be checked.

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