Mealybugs have piercing-sucking mouthparts, and damage appears as chlorotic spots on the leaves. They tend to congregate together, appearing like fluffs of cotton on the foliage. F. Some common host plants are azalea, coleus, croton, cactus, rose, bedding plants and a large number of foliage plants. Mealybugs are one of the major problems affecting plants in greenhouses and interiorscapes. They are more commonly found on camellia, crepe myrtle, gardenia, hibiscus, ixora, oleander, palm and rose as well as nearly all bedding and foliage plants.
Aphids have piercing-sucking mouthparts and cause damage by sucking plant juices.
However, their ability to transmit plant viral diseases may be more harmful than any direct feeding damage. Aphids are commonly found on young, developing leaves and stems in clusters or colonies of individuals. Their feeding distorts the new growth and the leaves curl . Most aphids are wingless, but when colonies become overcrowded, winged forms are produced. The most distinguishing feature in the identification of aphids are the two short tubes, or cornicles, which extend from the rear of the body.