Houseplants.
Mealybugs are soft-bodied insects that are about 1/8-inch in length. They have a white powdery substance over their bodies and white, waxy filaments projecting from the rear of their bodies. They are unarmored but have a rubbery outer coating that cannot be detached. They may be flat, oval, or globular, and some secrete wax.
Of the many species that may occur on greenhouse floral crops, probably the most common one is the citrus mealybug. Mealybugs injure plants by sucking juices from tender foliage and roots of many greenhouse crops. Heavy infestations result in stunted and distorted new growth. Additionally, like many other insects, honeydew is excreted which gives rise to black sooty mold.