I have spotted some insect in my wall farm (please see picture). I have clean with water all my plants and the wall farm also. I have still some. What are they ? what can I do to destroy them definitely ? Are the plants still comestible ?
A good exterminator is a liquid dish soap like Ivory in a spray bottle. When I use liquid detergent I use a 2 water to 1 soap. Cut yours to your comfort level.
I also understand that the plants like the nitrates in the soap.
If there’s only a few aphids that have not started a colony yet you should just collect them and monitor your plants carefully. Maybe you get away just with a warning
Soap is does not taste good on edible plants, if you intend to eat them soon.