Aphids

These tiny pests are present on most Brassicas in warm weather. The only time they really disappear is when it gets cold. The simplest way to deal with them is to blast them off the plants with a strong jet of water.

Quail

Quail seem to have a particular affection for Kale and in winter they may strip all of the leaves from the plants. If you are to get any Kale at all in such circumstances you may have to net the plants.