By Mary H. Dyer, Master Naturalist and Master Gardener Dahlias are stunningly beautiful, relatively easy plants that produce clusters of luscious blooms from early summer through late fall, but discovering dahlia insect pests on your prized plants is a frustrating, disheartening experience. Read on to learn about insects that like dahlias, and about treating pests that affect dahlias. Bugs Eating My Dahlias! Below are the most common insect pests affecting dahlia plants in the garden: Thrips – Slender pests with fringed wings, thrips damage plants by puncturing the leaves and sucking out the juices. Although thrips rarely kill dahlias, they can affect the appearance by causing stippled leaves, leaf drop and stunted growth. Pesticides aren’t usually helpful because the pests move from plant to plant so quickly. Spider mites – About the size of a tiny speck of sand, tiny spider mites are difficult to see with the naked eye.
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