Why Are Agapanthus Leaves Yellow. Fortunately they dont cause much damage to the plants and are best dealt with by picking them off by hand when you spot them. Why are the lower leaves turning yellow.
A good liquid feed is a sensible way to go Jason. Warm and damp weather can lead to pathogen attacks and cause the lower parts of the plants to rot. The larvae hatch within a few days and may feed on the agapanthus roots or root hairs causing the plants leaves to turn yellow.
These will be replaced by healthy new leaves as the season extends.
08102008 Snails love to shelter in the leaves of agapanthus plants. If you could persuade some of your cricketers to take up gardening instead of sport wed be very grateful. Scorched leaves develop dry yellow or brown tips and margins. What type of soil are you growing then in.