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The kale is showing signs of white-fly infestation; those insects are a tenacious pain.
If proper attention is given to ventilation and moisture, there will not be much danger from the green plant-louse (aphis) and white-fly, but at the first sign of one fight them to a finish.
Air! water! and do not let the green plant-lice or the white-fly get a ghost of a chance to start.
In greenhouses, the white-fly on cucumbers and tomatoes may be killed by overnight fumigation with 1 oz. of potassium cyanide to every 1000 cu.
The use of hydrocyanic acid gas in greenhouses is now coming to be common, for plant-lice, white-fly, and other insects.
The only things we use are Bacillus thuringiensis and sometimes a bit of oil spray when the white-fly gets too thick. "