Sometimes there is no control available. In the case of diseased plant material, any of these steps will help minimize spore production. Leaves are sticky, yellow, and distorted. Aphids are tiny insects that come in many colors and suck plant juices from the leaves. You ll often find them in vast colonies on succulent, new growth.
Flea beetles are tiny black insects that hop like fleas when disturbed.
They chew little holes throughout the leaf surface. Although flea beetles are rarely a problem to well-established plants, you can spray them with pyrethrins, methoxychlor, diazinon, or carbaryl. Leaves have big, ragged holes in them, and some leaves even appear to be missing. Only a few may be present but they are absolutely voracious eaters. The Colorado potato beetle is a yellow, black-striped insect.