Butterflies
The butterfly is a beautiful creature to look at when your on your allotment garden, however its catapillar will happily eat leaves from your cabbages. They are easy to control without using chemicals. Regular checks under leaves for clusters of eggs that can be washed off or crushed with your finger.
If you miss a batch of eggs then you can pick off the caterpillars by hand & dispose of them away from the plant.
Blog by Mark Burton (Allotment Secretary)