Question
I have two lemon trees that keep losing their leaves.  Have searched for pests but apparently they hide out in daytime hours.  Did find a cocoon of some sort on one of the trunks and removed and destroyed it promptly.  Seemed to have slowed the progress for a while, but alas, I think it's back.  I'm in Louisiana if it matters and the trees are indoors at an east window.  It seems to prefer one tree over the other...one tree has only two leaves left. Did find some small cotton ball looking things under leaves and removed them.  Please help me get some lemons.

Answer
Water the plant thoroughly and place it in bright, direct light. A western or southern exposure is best. Don抰 let the soil get too dry between waterings. Citrus trees like regular watering.

Citrus trees are heavy feeders, so they should be fertilized once a month with a chelated mix of manganese, iron and zinc (most multipurpose fertilizers contain these minerals).

Citrus trees love humidity. You can add moisture to the air with a humidifier, by misting the plants frequently, or by placing them in a tray filled with pebbles and water added to the top of the pebbles. Be careful not to place your plants directly in front of a vent or in drafts.

During the warm summer months, let your tree benefit from the sun outdoors. Be sure you acclimate your plant to the brighter sunlight gradually, placing it outdoors in a shady spot for a few days before moving it into intense sunlight.

As your tree grows larger, consider placing it on a decorative platform with casters to make moving it easier.

Citrus trees produce a multitude of blossoms, not all of which will produce fruit. To help increase the number of fruit-bearing blossoms on your tree, try aiding pollination by brushing the stamens of an open blossom with a soft paintbrush, moving from blossom to blossom.

Citrus is susceptible to spider mites, mealybugs and scale. Check the trunk for mealybugs and scale. If you find evidence of these pests, try dipping a cotton swab in alcohol and rubbing the infected area. Check especially the joints where the leaves join the stem. To treat spider mites, spray your plant with insecticidal soap or horticulturist oil, which will smother the insects