See through tomato leaves?

[Jones96]

Hi everyone,
We’re experiencing a strange phenomena where parts of our tomato plants are going see through! Unclear if it’s due to some sort of bug eating particular parts of the leaves or some sort of fungus/disease. Any help would be appreciated! SE QLD and the plants are all outdoor under filtered sunlight. Can’t see any bugs or bug faeces on there

 

[Chuck]

Skeletonized leaves are caused by caterpillars or insects. It is not a disease. In Texas it is caused by Flea Beetles, baby Hornworms and Loopers. I would spray the entire plant with Spinosad and Bt.

 

[Oliver Buckle]

Possibly leaf miners, you won't see them.