There are several tropical plant species that are susceptible to chill injury at temperatures at or below 50°F. So, make plans now to start moving them back indoors. It is best to move plants indoors when the outside temperatures are similar to indoor temperatures. But before making the move acclimate the houseplants by placing them in a lightly shaded area for a couple of days, gradually moving them to a fully shaded location. This process will take about a week and will reduce the stress on the plant. Keep in mind that even after following these steps plants may still experience leaf yellowing due to stress from the move. Remember to carefully inspect each plant for insects that may be hiding within the foliage, in the soil or even under the container. Insecticidal soaps work well for eliminating most soft bodied insects that are often found on houseplants. For best results, spray the upper and lower surface of the leaves with insecticidal soap. Check the label for plant sensitivity. For more information, see HGIC1454, Indoor Plants- Moving Plants Indoors & Outdoors.