However, if there are no ladybugs, control measures may be called for. A strong jet of water from a garden hose may be all that is needed. Repeat as necessary. If this is not possible, insecticides can be used such as horticultural oil, insecticidal soap, acephate (Acephate, Orthene), malathion, cyfluthrin (Baythroid, BioAdvanced Vegetable and Garden Insect Spray) or permethrin (38 Plus Turf, Termite & Ornamental Insect Spray; Eight Vegetable, Fruit & Flower Concentrate; Garden and Farm Insect Control). Reapplication may be needed.
Remember that drought can also cause daylily foliage to brown. (Ward Upham)