Patchy spinach

[Lady BlackThumb]

My red kitten spinach started getting these weird wilty patches on them. Can anyone identify the problem and how to fix (preferably without pesticides etc)?

[ameno]

Some sort of leaf miner, by the looks of it.
Remove and dispose of affected leaves, and cover the plants with insect mesh to prevent adults flying in and laying more eggs.

[Lady BlackThumb]

Eep! Thanks, ameeno. Will try that .