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Plant NameTypeDescription 
VirusDahliaDiseaseTomato spotted wilt virus (thrips vector) induces a yellow-green mosaic, irregular concentric rings, or even wavy-lines in older leaves. Dahlia mosaic virus (aphid vector) produces chlorosis along veins and may shorten internodes, facilitating a stunted or bushy appearance. The tomato-ringspot-related virus (probably nematode vector) produces necrotic patches and marginal necrosis on the leaf blade.
EarwigsDahliaInsectEarwigs are reddish-brown insects about 3/4" or less in length. Both males and females have pincers at the rear end. Earwigs are largely beneficial, feeding on many pests such as aphids (including apple aphids), mites, and nematodes, as well as on algae, fungi, and decaying plant material. However, earwigs can also damage plants. They sometimes feed on flowers, shoot tips, or leaves. Damaged shoot tips may fail to develop properly, sometimes stunting growth. Damaged leaves exhibit small to large holes.
Western spotted cucumber beetleDahliaInsectThe western spotted cucumber beetle is a pest of many ornamentals and vegetables. About 1/4" long, the adult beetles have yellow wing covers with black spots. The rest of the body is black. Adults feed on leaves of plants, while the larvae feed on the roots of some plants.