all fertilizer should be with held between november and march. the exception is the short day bloomers such as cacti, poinsettias, etc.
give your plants a thorough examination. look at the stems and the underside of the leaves.
anything sticky or fuzzy is not a good sign. mealybugs are the fuzzy ones and scales leaves a sticky substance on the leaves and sometimes the floor!! if the infestation is light, a q tip and alcohol will keep the little 'buggers' at bay. i use an ice pick to get into the areas that a cotton swab will not. do not even consider keeping a seasonal plant that might be infected. throw it out. it is not worth infesting your other house plants. i know this because...i just threw out 65 orchids in the fall. i had been fighting mealybugs on them for a long time. the orchids (all phals) had been collected over the years and i had some wonderful varieties. it made me sadbut i should have done it several years ago.
if your plants are small enough ,give them a shower. wash large leaves with a soft cloth dipped in water and a very small amount of dish detergent. your plants will love it.