Fruit calyx and stem end infection by San Jose scale

San Jose scale is usually concentrated around the calyx or stem end, but may occur anywhere on the fruit surface.

 Heavy infestations of San Jose scale on the bark and stems of apple trees can cause dieback and serious loss of production. The main economic damage from scale insects is fruit infection near the calyx or stem end, accompanied by fruit discolouration. Early season fruit feeding can cause some fruit distortion or pitting. Stem infestation by tiny scale insects may appear to be a change in stem texture and their feeding can also cause discolouration.

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