Aphids
of aphids can cause leaves to curl or twist as they feed on the plant sap. How to prevent aphids To prevent aphid infestations in crops, you can take several [...] leaves: Aphids feed on the sap of plants, which can cause the leaves to turn yellow or become distorted. The damage is often more pronounced on the younger leaves [...] Aphids are slow-moving and tend to cluster on the undersides of leaves, where they feed on plant sap. They may also be found on stems, buds, flowers and fruit