Each year, we receive a number of calls and questions about the tulip disease Trichoderma. In tulips, the symptoms of Trichoderma depend on the degree of attack. With a mild attack, plant growth is not reduced and plants flower well. In the case of a severe attack, plant growth is inhibited starting 7-10 days before flowering and the leaf tips begin to dry out, leading to a grayish-white injured area. These changes can occur very quickly, often within 24 hours.