How to Manage Pests

Pests in Gardens and Landscapes

Pink root—Phoma terrestris

Roots of plants infected with pink root first turn light pink, then darken through red and purple, shrivel, turn black, and die. New roots also may become infected and plants may become stunted. Infection is confined to the roots, and death seldom results.

Life cycle


Prevention and control of pink root include use of resistant varieties, good soil fertility, and control of insects and other diseases to maintain healthy plants. Rotate out of garlic or onions to reduce the severity of the disease. Soil solarization may help to reduce disease levels in the soil before planting.


Healthy bulb (left) and infected bulbs
Healthy bulb (left) and infected bulbs

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