A. Horse
chestnut (Aesculus hippocastanum) trees are susceptible to a
fungal disease called
leaf blotch.
This fungal disease causes reddish-brown spots on the leaves
that are often surrounded by yellow halos. Infected leaves turn
brown and fall prematurely.
Leaf blotch is more severe when we have wet
spring weather, but it can be equally severe during hot, dry
weather.
Highly valued trees can be sprayed preventatively
with mancozeb (Dithane, Protect Turf and Ornamental Fungicide)
fungicide, but treatment is not usually warranted. Although it
is unsightly and messy, leaf blotch is not life threatening.
