apple
bark
biology
black cancer
branches
colony
colourful
colours
common
cortex
countryside
cracks
death
disease
ecology
ecosystem
fruits
fungal
fungus
garden
gemibiotroph
green
growing
growth
infections
lesions
lichen
malorum
moss
mycelium
nature
outdoors
pathogen
pear
peck
pollution
pruning
rough
sphaeropsis
spores
spots
spring
treatment
tree
tree branch
trunk
white
work
wound