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Overview A look at how to keep your plants happy and avoid pests & diseases. Ants Often, but not always, beneficial to Passiflora. 'Black Death' Alarming looking but non-fatal black foliage damage that some Passiflora are prone to. 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.