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Especially nudibranchs have it on the leaves and flowers apart. Unless the nocturnal visitors can be seen on their own, traces of mucus and feces point towards them. Protect the plants, especially in humid summers, early with slug pellets, which you sprinkle according to instructions for use broadly on the beds.
A mouse-gray fungus deposit on the above-ground parts is a sure indication of gray mold (botrytis). Yellowish, initially inconspicuous spots on the lower leaves - but quickly turning gray - indicate the Entyloma leaf spot disease. Stems are also affected by the disease. In both cases, clean the dahlias regularly and avoid too close a stance, as fungal infections in the warm, humid microclimate can spread rapidly.
Thrips occur in the flowers and leaves. They hardly damage the plants, but affect the appearance with stains and black droppings. Various owl caterpillars (butterfly larvae) eat on the leaves and flowers of dahlias. They are easy to pick up, especially in the evening. Wilting symptoms can be caused by soil fungi. No matter if fungus or pest infestation: Heavily damaged plants should be removed better.