Cabbage worms cause serious damage by feeding on broccoli leaves. Aphids – Aphids are tiny, soft-bodied insects that feed on the undersides of broccoli leaves, causing them to become discolored and wrinkled. A strong spray of water from a hose knocks them off the plant.Click to see full answer. Also asked, what’s eating my cauliflower leaves?Knowing the most common cauliflower pests is a good start to vetting the problem and annihilating these annoying and destructive bugs on cauliflower plants. The most common cauliflower pests are aphids, flea beetles, slugs and snails, leaf hoppers, and several insect larva.Subsequently, question is, why are there holes in my broccoli leaves? In addition, the leaves of my broccoli, cauliflower and kale had the same problem. These small holes are telltale signs of the cabbage worm. Actually, the are several insects that cause this type of damage and are generally referred to as ‘cabbage worms’. In this way, how do I keep bugs from eating my broccoli? Use Soap Spray The fatty acids in soap spray kill feeding bugs on contact. It works best against such soft-bodied broccoli pests as aphids, spider mites and whiteflies. Commercial insecticidal soap spray products are available in either premixed or concentrated forms.How do you protect cauliflower from insects?Again, as with cauliflower frost protection, row covers will help protect young plants from common pests like cabbage worms, root maggots and flea beetles. Cabbage worms can also be picked off by hand, and aphids can be sprayed off with a stream of water followed by neem oil. Slugs and snails can be killed with bait.