|I have skinny black bugs with red sides on my sunflowers. They seem to be sucking the fluid out of the stalks and then shoot out clear drops of liquid from the rear. When one bug approaches another the|
|I can't tell from your description what the bug might be but here's a website with photos of the most common black bugs with red sides and their true identities:
Once you figure out which bug you have on your sunflowers you can decide whether they are harmless or harmful to your sunflowers.
Best wishes with your garden!