peach fruit infected by fruit virus in the tree

fruit peach agriculture damage defect disease fungicide fungus injury nature nectarine parasite pathogen spores ulcer bacteria damaged exude farm fungal gel gum gummosis gummy infection insect pest problem spot symptom crooked gnarled herbicide horticulture infected insecticide pathology control selective focus untreated virus blemish fungi spoiled unhealthy crop wrinkle growing shrink tree