Cabbage white butterflies are one of the most common pests in vegetable gardens. While the butterflies themselves are harmless, they lay eggs on brassica plants such as cabbage, broccoli and kale. When the eggs hatch, the caterpillars begin feeding on leaves and can quickly destroy crops.
Fortunately there are several simple ways to protect brassicas and prevent caterpillar damage.
This image shows the caterpillar of the cabbage white butterfly causing damage.
Why Cabbage White Butterflies Are a Problem
Cabbage white butterflies are attracted to brassica plants because they provide food for their caterpillars. After laying eggs on leaves, the caterpillars hatch and begin feeding immediately.
Signs of cabbage white damage include:
- holes in leaves
- chewed edges
- green caterpillars on plants
If left untreated, caterpillars can completely defoliate plants.
Using Insect Netting
The most effective way to stop cabbage white butterflies is by covering crops with fine insect netting or cabbage white butterfly netting The small holes in insect mesh prevent butterflies from reaching plants and laying eggs.
Netting allows sunlight and rain through while keeping pests away.
Supporting Netting with Garden Hoops
Netting works best when supported above plants. Many gardeners use garden hoops to create protective tunnels over brassica beds.
Hoops hold the netting above the plants so that butterflies cannot reach them.
Checking Plants Regularly
Even with netting in place it is still useful to inspect plants regularly. Removing any caterpillars that appear can prevent further damage.
Protecting Brassicas Throughout the Season
Brassica crops are often grown throughout spring and summer when cabbage white butterflies are most active. Keeping crops covered with insect netting throughout the growing season is the best way to prevent infestations.
Explore our range of insect netting for vegetables to protect cabbage and other brassica crops.