deformation
affected
agricultural
aphid
apple
apple tree
attack
biology
closeup
control
cultivation
curled
damage
danger
death
defense
deficit
detail
disease
distorted
farming
foliage
garden
green
harm
illness
infection
infestation
insects
invasion
leaf
nature
orchard
pathology
pesticide
prevention
problem
protection
sick
spot
stem
suck
summer
symptom
toxic
tree branch
trouble
twisted
vegetation
wrinkled