Dahlias tend to attract quite a bit of insects, some which are dangerous and harmful to their survival. Insects like slugs, earwigs, the red spider, snails, caterpillars, aphids, and thrips threaten dahlias because they can eat the petals, leave slime trials, leave tattered petals, etc. Dahlias can also become infected with the following diseases: Sclerotinia disease, fungal diseases, mildew, Botrytis, Crown Gall, etc. If dahlias do become infected with these they can wilt, have spots on the leaves, the leaves can get irregular coloring/ patterning, etc.
