Common issues #2
Leaf miner
There's not much point in in gardening if one doesn't address issues.
In the above photo, the large raised bed in the right. Leaf miners.
I identified the issue far too late. A moth lays it's eggs inside the leaf, thus, it's progeny are protected from predictors. All the leafy greens are affected.
The only known effective remedy is cold pressed neem oil seed. Canadian garden centres can't sell it. It's not an approved pesticide. Agricultural Canada doesn't, themselves, test. It relies on agra-business to submit their findings of efficacy. Agra-business has not done so because it's not patentable and thus, deemed unprofitable. Agricultural Canada doesn't deny efficacy, but it does depend on industry for proof, and in Canada, no proof has been submitted.
Neem oil has a 500 to 1,000 year history in India, depending on source, as an organic pesticide. A multinational company tried to patent it, the government of India objected, citing history, and won.
All said, it's available in apothecaries in Canada, and I purchased mine in Inglewood. Besides being a pesticide, it has other uses, and it's sold in apothecaries for uses other than a pesticide. It's available for sale in most countries as a pesticide, just not here.