Attract beneficial insects: Clover, mint, dill, fennel, and yarrow; Natural aphid repellents: Catnip, garlic, chives, onion, and allium If you pay close attention to the patterns, you can identify the … The primary danger with cloches is … Earwigs can be both a beneficial insect and a garden pest. But truthfully, after losing my harvests a couple of years in a row because of Japanese Beetles, I have been known to throw in my organic towel and pull out the Sevin Dust.. For single plants, make inexpensive cloches by cutting the bottom off of gallon plastic milk jugs and setting them over the plants. I knew what to do and have taken steps to remedy this. There are dwarf varieties and tall varieties that will grow up to 4 ft. tall. Mainly, I wrote to tell you how gorgeous your pictures are, even of the leaf-eating bug! Bugs Eating My Dahlias! You can also plant some aphid favorites as trap plants to lure aphids away from plants you are trying to protect. I will use your remedy, as I know it is not an aphid problem. Okay, let me say, I try to keep an organic garden. Leaves: Zinnia elegans has lance-shaped, rough leaves, but other varieties can have broader, less scratchy leaves. Common brown leafhopper. Unfortunately, bugs like aphids, whiteflies, mites, and beetles tend to like herb gardens too, and they can eat up all your beautiful herbs if you do not address them. 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. However, while it does do damage from feeding, what it’s known for is the long list of damaging diseases it carries. Many bug and butterfly watchers have observed that low-growing zinnias are less attractive than taller varieties, and single-flowered strains are preferred over doubles. Insect Pest Prevention & Control: Zinnias are excellent sources of pollen and nectar for many beneficial insects; therefore, it is not recommended that insecticides, other than insecticidal soap, be used to control damaging mite and insect pests. Flowers: Wide variety of bold colored, rounded flowers. Read on to learn about insects that like dahlias, and about treating pests that affect dahlias. Also, keep your garden clean of dead plant material that may be harboring aphid eggs over winter. Source: Doug Beckers. While it came from Australia, the common brown leafhopper is now a pest worldwide. Learn how to control an overpopulation by killing earwigs using traps and preventing … Sometimes you need to protect only one plant or row of plants. That pattern of lines is a feeding tunnel created by the leaf miners as they chew through plants. It's the foliage that gets powdery mildew. Informational table showing disease name, symptoms, pathogen/cause, and management of Zinnia diseases. 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