Landscaping - Insects & Diseases
There are many causes of garden flower and perennial landscape plant problems, and a number of these problems can appear to have the same symptoms on the plant.
To identify the cause of the plant’s problem, it is usually necessary to look at the plant closely; examine the flowers, leaves, stem and (sometimes) the roots; and do some detective work to determine possible causes. Often the process of elimination of the possible causes will lead to the identification of the problem. Once the cause is correctly identified, corrective measures can be taken to eliminate or reduce the problem.
"SP370-K-Identifying Problems of Garden Flowers," The University of Tennessee Agricultural Extension Service, SP 370K-500-5/02 (Rev) E12-4615-00-035-02, https://trace.tennessee.edu/utk_agexgard/57