Phyllosphere is a term used to refer to the environment in the areas of the aboveground portions of a plant, especially the leaves. It attracts many insects. The study of insects is called entomology and a horticulturist must learn to recognize the beneficial and harmful insects in a garden. Insect pollinators are beneficial. Insects that eat plant parts are destructive. Common destructive insects are mealy bugs, aphids, white flies, thrips, caterpillars, and grasshoppers. Plant viruses are often spread from plant to plant by aphids and thrips, as well as mealybugs and some leafhoppers, so you need to watch for signs of viral infections in plants that have been infested with these insects.
Daily walks through the garden, greenhouse, or commercial field will alert you to potential insect infestations before they get out of hand. This is one of the responsibilities of the greenhouse or farm manager. If plants become heavily infested, physical
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