Overview A look at how to keep your plants happy and avoid pests & diseases.Ants Often, but not always, beneficial to Passiflora. Butterflies Both a major predator in caterpillar form and a possible pollinator as adults. |  | Greenfly & Blackfly Minor biting damage but can introduce viruses. Leaf rollers Usually Tortrix moth caterpillars, only a threat to small plants. Scale insects Sap suckers which can greatly weaken plants. |  | Slugs & snails A big problem for some of us -they can strip and kill a small plant overnight.Spider mite Very hard to spot and very difficult to get rid of in greenhouses. Viruses A real nuisance especially for commercial growers. |