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How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Phomopsis cane and leaf spot

Life cycleInfection generally occurs in spring when shoots begin to grow. Around budbreak, spores released from overwintering structures on diseased canes, spurs, and bark are splashed by rain onto newly developing shoots. Infection occurs when free moisture remains on the unprotected green tissues for many hours. Heavy and prolonged rains in late March and April, soon after budbreak, are ideal for spring infection.

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