How to Manage Pests

Pests in Gardens and Landscapes

Bitter pit

At the earliest stages of development, bitter pit lesions, which usually occur near the fruit's calyx, start as small, water-soaked spots on the skin. These spots gradually turn a deeper color than the surrounding fruit surface and, as the tissue underneath dies, they turn brown. Shallow, dark brown areas are present beneath these spots and resemble small bruises. With time the spots become slightly sunken, and the underlying dark brown tissue dries and becomes spongy. Generally symptoms do not fully develop until after 1 or 2 months of storage.

Solutions

Bitter pit is related to low calcium levels in fruit, but is not usually directly related to the amount of calcium applied. Cultural practices can influence calcium availability to fruit, but no practice completely prevents bitter pit symptoms. Maintain a constant soil moisture supply. Reducing excessive vegetative growth without overpruning can reduce bitter pit. Early thinning or overthinning may increase its incidence. Overfertilizing or harvesting too early may cause symptoms to increase. Some cultivars are less susceptible than others to bitter pit.

Bitter pit lesionsBitter pit lesions


Statewide IPM Program, Agriculture and Natural Resources, University of California
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Agriculture and Natural Resources, University of California

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