For crinum, hippeastrum, and other amaryllids in active growth (or when they should be), I mix per gallon of water: 0.5 fl oz (15cc) bifenthrin 1 tsp (2cc) dish detergent Optional: Soluble fertilizer Micronutrients Periodically, I spray this in the center of all the plants, drenching those with leaves and those without. Bifenthrin is not systemic but persists on the leaves and in the soil. Do not apply where runoff into waterways may be a problem. And if you're not already female, you may want to wear gloves when handling pyrethroids as nearly everything out there acts as a synthetic estrogen. For acute infestations, you may want to buy some orange oil which is sold as detergent and insecticide. It is quick acting but fugitive and (unlike the pyrethroids) completely safe for use around cats and food. It attacks the chiton in invertebrates, rather than the nervous system. Very satisfying to use on ant infestations in the kitchen, though it doesn't treat the source. $.02 Tim