An improved growth medium for enhanced inoculum production and in vitro cultivability of slow growing apple leaf blotch fungus Marssonina coronaria

Apple leaf blotch disease caused by the fungus Marssonina coronaria is a serious foliar disease that threatens the successful cultivation of apples in Himachal Pradesh. In vitro culture studies are important for studying host plant growth and taxonomy. The apple orchard survey in the state of Himachal Pradesh revealed that the disease was widespread. The highest disease incidence range (85.56–88.78