Plant bugs cause spotting on the upper leaf surface and deformed blossom heads as a result of feeding. In some instances the injury resembles fungal spotting. Two spotted spider mite, cyclamen mites and broad mites are three mite species that can cause problems in cut flowers. Two spotted mites are most active on the underside of the leaves, their presence being apparent by the fine stippling caused by their feeding and seen on the upper surface of the leaves. Fine webbing is produced by the mites.
Leaves turn yellow or bronze, and many drop.
Cyclamen mites and broad mites are invisible to the naked eye but cause a great deal of damage, particularly to Delphiniums, Aconitum, Dahlia, Chrysanthemum, and Verbena. Mite feeding causes the leaves to curl, twist, and become brittle and scabby. Flower buds may dry up and die. Light infestations may result in discolored or dark-flecked flowers. On Delphinium, leaves cup or curl and are blackened.