Picture of the Week
June 20, 2022
Tulip Leaf Drop-No Cause For Alarm
Gail Ruhl, Sr. Plant Disease Diagnostician-retired, Purdue University
Premature yellowing and leaf drop observed on tulip tree (Liriodendron tulipifera), also known as yellow poplar and tulip poplar. (Figures 1 and 2) are symptoms most likely related to root stress. Extended periods of hot, dry, weather in combination with various site stress factors, are likely contributing factors. An added symptom that frequently accompanies the leaf yellowing is the appearance of circular, black spots between the veins of the yellowing leaves (Figures 3 and 4). The black spots are often mistaken for a fungal leaf spot disease. Though alarming in appearance these symptoms do not usually affect long-term tree vigor or health.
Click image to enlarge
Figure 1. Tulip tree leaf drop 
Figure 2. Yellow and brown leaves on a tulip tree branch 
Figure 3. Close-up of a tulip tree leaf showing physiological leaf spot 
Figure 4. Tulip tree leaves with a leaf spot See this related article by John Bonkowski:
