You can also plant some aphid favorites as trap plants to lure aphids away from plants you are trying to protect. Learn how to control an overpopulation by killing earwigs using traps and preventing … There are dwarf varieties and tall varieties that will grow up to 4 ft. tall. Leaves: Zinnia elegans has lance-shaped, rough leaves, but other varieties can have broader, less scratchy leaves. Attract beneficial insects: Clover, mint, dill, fennel, and yarrow; Natural aphid repellents: Catnip, garlic, chives, onion, and allium 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. I will use your remedy, as I know it is not an aphid problem. 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.. Flowers: Wide variety of bold colored, rounded flowers. I knew what to do and have taken steps to remedy this. 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. You can use garden spray or set traps to kill bugs in your garden. For single plants, make inexpensive cloches by cutting the bottom off of gallon plastic milk jugs and setting them over the plants. Earwigs can be both a beneficial insect and a garden pest. I also spread some Diatomaceous Earth around the stalks…I’ll let you know. Flowers can be daisy-like, double, cactus-flowered or a formal looking dahlia like flower. Common brown leafhopper. A cloche is a temporary cover sized and shaped to fit a particular plant. 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. Sometimes you need to protect only one plant or row of plants. While it came from Australia, the common brown leafhopper is now a pest worldwide. Bugs Eating My Dahlias! But something is GORGING on the leaves of my sunflower plants. Informational table showing disease name, symptoms, pathogen/cause, and management of Zinnia diseases. 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. The first thing you might notice is distinct, discolored lines on foliage since these pests live inside leaves. 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