general fruit cracking is common and its cause is not well-understood
Fruit
General fruit cracking is common and its cause is not well-understood.
Lenticels within a sunburned area on fruit frequently become brown or black.
Lesions caused by bitter pit of apple are focused closer to the calyx end.
When sunburn is severe, fruit can crack. Fruit can be protected from sunburn by applying the product, Surround, which creates a reflective white surface.
"Jonathon spot" occurs on Jonathon Rome, Gravenstein, and other varieties. Its cause is unknown.
San Jose scale bodies can be rubbed off of fruit for home consumption, but fruit is unacceptable for the retail market.
Apple scab is somewhat rare in Utah, causing black, circular, scabby lesions.
Thrips are tiny insects that can lay eggs on the developing apple, causing a "pansy" shaped spot.
Light frost damage will show up as a ring of small lesions around the bottom of the apple.
When campylomma bugs feed on developing fruitlets in spring, they cause a raised blister.
Hail damage can sometimes look like insect damage or a disorder.
Frost injury often appears as a circular ring of russet around the apple.
Some nutrient or pesticide sprays can puddle at the stem end, and cause russeting of the fruit skin.
Birds are becoming more and more of a problem in orchards.