Along with leaf decline, growth is stunted. To sample for mites in your daylilies, follow the same procedure discussed in the thrips section above. Removing nearby weeds before spring growth is an important step in the control of spider mites. Insecticidal soap, if started early in the infestation, is effective at controlling spider mites. As with all pesticides, read and follow all label directions and precautions.
Various aphids can be pests on daylilies.
They are typically more of a problem during cool weather in the spring. They feed on leaves and flower buds by inserting their mouthparts and sucking plant sap. Their feeding can result in deformed leaves and small warty growths on flower buds. The sooty mold fungus feeds on the honeydew, resulting in dark fungal growth, which is very unsightly. As much as possible, these predators should be allowed to reduce aphid populations.