Please help identify problem

[jhinkle]

I have 4 tomato plants.

Each of them have the leaves as shown in the picture.

The leaves curl under and get brittle and have a dirty like substance on them (fungus???).

Any help as to how to address this issue would be appreciated.

[imafan26]

Powdery mildew. Take off the lower leaves of the plant and open it up by removing any leaves you don't need. Make sure you discard of infected leaves and debris to get rid of the spores. Make sure the plant gets plenty of air circulation. Powdery mildew thrives in humid conditions. It is best to start a fungicide program before you have a problem as soon as environmental conditions conducive to fungal growth occurs. Like long periods of continuous rain will be folllowed by humid conditions after the rain stops. Spray within 24 hours of the rain stopping. Reapply if it rains again. It is easier to control fungal infectiions before they start.

https://www.ipm.ucdavis.edu/PMG/r783100411.html

[jhinkle]

Thanks.

I'm in Key west. We have gotten a LOT of rain and being right on the ocean -- the humidity is up there.

What do you recommend I spray with?

I have removed most leaves that have been infected but one plant has so few leaves left -- it has stopped growing.