Holes in leaves in hydroponic system but no bugs
My tomato plants are developing holes in the leaves and it looks like a bug has been chewing on them but there are no bugs. Also the leaf edges are curling upward as though they are trying to dissipate water but its hydroponic continuous feed in hydroclay.
The root system is nice and white and healthy and I have flushed the system 3 times and made new nutrient solutions.
The only thing I can think of is that I had fungus gnats so I used malathion as a spray on the leaves and in the medium cause you could see them running around in there. I battled them for a week and I think I won although the plants did get quite a dose of malathion.
Maybe a lot more flushing and time is needed?
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