and life cycle—Phomopsis cane and leaf spot
Infection 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.